Python: maximum recursion depth exceeded while calling a Python object

Instead of doing recursion, the parts of the code with checkNextID(ID + 18) and similar could be replaced with ID+=18, and then if you remove all instances of return 0, then it should do the same thing but as a simple loop. You should then put a return 0 at the end and make your variables non-global.

Python: Maximum recursion depth exceeded

You can increment the stack depth allowed - with this, deeper recursive calls will be possible, like this:

import sys
sys.setrecursionlimit(10000) # 10000 is an example, try with different values

... But I'd advise you to first try to optimize your code, for instance, using iteration instead of recursion.

Open Popup window using javascript

First point is- showing multiple popups is not desirable in terms of usability.

But you can achieve it by using multiple popup names

var newwindow;
function createPop(url, name)
{    
   newwindow=window.open(url,name,'width=560,height=340,toolbar=0,menubar=0,location=0');  
   if (window.focus) {newwindow.focus()}
}

Better approach will be showing both in a single page in two different iFrames or Divs.

Update:

So I will suggest to create a new tab in the test.aspx page to show the report, instead of replacing the image content and placing the pdf.

git: How to ignore all present untracked files?

Two ways:

use the argument -uno to git-status. Here's an example:

[jenny@jenny_vmware:ft]$ git status
# On branch ft
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#       foo
nothing added to commit but untracked files present (use "git add" to track)
[jenny@jenny_vmware:ft]$ git status -uno
# On branch ft
nothing to commit (working directory clean)

Or you can add the files and directories to .gitignore, in which case they will never show up.

How to set date format in HTML date input tag?

I found same question or related question on stackoverflow

Is there any way to change input type=“date” format?

I found one simple solution, You can not give particulate Format but you can customize Like this.

HTML Code:

    <body>
<input type="date" id="dt" onchange="mydate1();" hidden/>
<input type="text" id="ndt"  onclick="mydate();" hidden />
<input type="button" Value="Date" onclick="mydate();" />
</body>

CSS Code:

#dt{text-indent: -500px;height:25px; width:200px;}

Javascript Code :

function mydate()
{
  //alert("");
document.getElementById("dt").hidden=false;
document.getElementById("ndt").hidden=true;
}
function mydate1()
{
 d=new Date(document.getElementById("dt").value);
dt=d.getDate();
mn=d.getMonth();
mn++;
yy=d.getFullYear();
document.getElementById("ndt").value=dt+"/"+mn+"/"+yy
document.getElementById("ndt").hidden=false;
document.getElementById("dt").hidden=true;
}

Output:

Add marker to Google Map on Click

In 2017, the solution is:

map.addListener('click', function(e) {
    placeMarker(e.latLng, map);
});

function placeMarker(position, map) {
    var marker = new google.maps.Marker({
        position: position,
        map: map
    });
    map.panTo(position);
}

how to remove pagination in datatable

if you want to remove pagination and but want ordering of dataTable then add this script at the end of your page!

_x000D_

<script>_x000D_
$(document).ready(function() {        _x000D_
    $('#table_id').DataTable({_x000D_
        "paging":   false,_x000D_
       "info":     false_x000D_
    } );_x000D_
      _x000D_
  } );_x000D_
</script>

_x000D_

Android sample bluetooth code to send a simple string via bluetooth

I made the following code so that even beginners can understand. Just copy the code and read comments. Note that message to be send is declared as a global variable which you can change just before sending the message. General changes can be done in Handler function.

multiplayerConnect.java

import android.annotation.SuppressLint;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Set;
import java.util.UUID;

public class multiplayerConnect extends AppCompatActivity {

public static final int REQUEST_ENABLE_BT=1;
ListView lv_paired_devices;
Set<BluetoothDevice> set_pairedDevices;
ArrayAdapter adapter_paired_devices;
BluetoothAdapter bluetoothAdapter;
public static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
public static final int MESSAGE_READ=0;
public static final int MESSAGE_WRITE=1;
public static final int CONNECTING=2;
public static final int CONNECTED=3;
public static final int NO_SOCKET_FOUND=4;


String bluetooth_message="00";




@SuppressLint("HandlerLeak")
Handler mHandler=new Handler()
{
    @Override
    public void handleMessage(Message msg_type) {
        super.handleMessage(msg_type);

        switch (msg_type.what){
            case MESSAGE_READ:

                byte[] readbuf=(byte[])msg_type.obj;
                String string_recieved=new String(readbuf);

                //do some task based on recieved string

                break;
            case MESSAGE_WRITE:

                if(msg_type.obj!=null){
                    ConnectedThread connectedThread=new ConnectedThread((BluetoothSocket)msg_type.obj);
                    connectedThread.write(bluetooth_message.getBytes());

                }
                break;

            case CONNECTED:
                Toast.makeText(getApplicationContext(),"Connected",Toast.LENGTH_SHORT).show();
                break;

            case CONNECTING:
                Toast.makeText(getApplicationContext(),"Connecting...",Toast.LENGTH_SHORT).show();
                break;

            case NO_SOCKET_FOUND:
                Toast.makeText(getApplicationContext(),"No socket found",Toast.LENGTH_SHORT).show();
                break;
        }
    }
};



@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.multiplayer_bluetooth);
    initialize_layout();
    initialize_bluetooth();
    start_accepting_connection();
    initialize_clicks();

}

public void start_accepting_connection()
{
    //call this on button click as suited by you

    AcceptThread acceptThread = new AcceptThread();
    acceptThread.start();
    Toast.makeText(getApplicationContext(),"accepting",Toast.LENGTH_SHORT).show();
}
public void initialize_clicks()
{
    lv_paired_devices.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id)
        {
            Object[] objects = set_pairedDevices.toArray();
            BluetoothDevice device = (BluetoothDevice) objects[position];

            ConnectThread connectThread = new ConnectThread(device);
            connectThread.start();

            Toast.makeText(getApplicationContext(),"device choosen "+device.getName(),Toast.LENGTH_SHORT).show();
        }
    });
}

public void initialize_layout()
{
    lv_paired_devices = (ListView)findViewById(R.id.lv_paired_devices);
    adapter_paired_devices = new ArrayAdapter(getApplicationContext(),R.layout.support_simple_spinner_dropdown_item);
    lv_paired_devices.setAdapter(adapter_paired_devices);
}

public void initialize_bluetooth()
{
    bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    if (bluetoothAdapter == null) {
        // Device doesn't support Bluetooth
        Toast.makeText(getApplicationContext(),"Your Device doesn't support bluetooth. you can play as Single player",Toast.LENGTH_SHORT).show();
        finish();
    }

    //Add these permisions before
//        <uses-permission android:name="android.permission.BLUETOOTH" />
//        <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
//        <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
//        <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

    if (!bluetoothAdapter.isEnabled()) {
        Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
    }

    else {
        set_pairedDevices = bluetoothAdapter.getBondedDevices();

        if (set_pairedDevices.size() > 0) {

            for (BluetoothDevice device : set_pairedDevices) {
                String deviceName = device.getName();
                String deviceHardwareAddress = device.getAddress(); // MAC address

                adapter_paired_devices.add(device.getName() + "\n" + device.getAddress());
            }
        }
    }
}


public class AcceptThread extends Thread
{
    private final BluetoothServerSocket serverSocket;

    public AcceptThread() {
        BluetoothServerSocket tmp = null;
        try {
            // MY_UUID is the app's UUID string, also used by the client code
            tmp = bluetoothAdapter.listenUsingRfcommWithServiceRecord("NAME",MY_UUID);
        } catch (IOException e) { }
        serverSocket = tmp;
    }

    public void run() {
        BluetoothSocket socket = null;
        // Keep listening until exception occurs or a socket is returned
        while (true) {
            try {
                socket = serverSocket.accept();
            } catch (IOException e) {
                break;
            }

            // If a connection was accepted
            if (socket != null)
            {
                // Do work to manage the connection (in a separate thread)
                mHandler.obtainMessage(CONNECTED).sendToTarget();
            }
        }
    }
}


private class ConnectThread extends Thread {
    private final BluetoothSocket mmSocket;
    private final BluetoothDevice mmDevice;

    public ConnectThread(BluetoothDevice device) {
        // Use a temporary object that is later assigned to mmSocket,
        // because mmSocket is final
        BluetoothSocket tmp = null;
        mmDevice = device;

        // Get a BluetoothSocket to connect with the given BluetoothDevice
        try {
            // MY_UUID is the app's UUID string, also used by the server code
            tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
        } catch (IOException e) { }
        mmSocket = tmp;
    }

    public void run() {
        // Cancel discovery because it will slow down the connection
        bluetoothAdapter.cancelDiscovery();

        try {
            // Connect the device through the socket. This will block
            // until it succeeds or throws an exception
            mHandler.obtainMessage(CONNECTING).sendToTarget();

            mmSocket.connect();
        } catch (IOException connectException) {
            // Unable to connect; close the socket and get out
            try {
                mmSocket.close();
            } catch (IOException closeException) { }
            return;
        }

        // Do work to manage the connection (in a separate thread)
//            bluetooth_message = "Initial message"
//            mHandler.obtainMessage(MESSAGE_WRITE,mmSocket).sendToTarget();
    }

    /** Will cancel an in-progress connection, and close the socket */
    public void cancel() {
        try {
            mmSocket.close();
        } catch (IOException e) { }
    }
}
private class ConnectedThread extends Thread {

    private final BluetoothSocket mmSocket;
    private final InputStream mmInStream;
    private final OutputStream mmOutStream;

    public ConnectedThread(BluetoothSocket socket) {
        mmSocket = socket;
        InputStream tmpIn = null;
        OutputStream tmpOut = null;

        // Get the input and output streams, using temp objects because
        // member streams are final
        try {
            tmpIn = socket.getInputStream();
            tmpOut = socket.getOutputStream();
        } catch (IOException e) { }

        mmInStream = tmpIn;
        mmOutStream = tmpOut;
    }

    public void run() {
        byte[] buffer = new byte[2];  // buffer store for the stream
        int bytes; // bytes returned from read()

        // Keep listening to the InputStream until an exception occurs
        while (true) {
            try {
                // Read from the InputStream
                bytes = mmInStream.read(buffer);
                // Send the obtained bytes to the UI activity
                mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer).sendToTarget();

            } catch (IOException e) {
                break;
            }
        }
    }

    /* Call this from the main activity to send data to the remote device */
    public void write(byte[] bytes) {
        try {
            mmOutStream.write(bytes);
        } catch (IOException e) { }
    }

    /* Call this from the main activity to shutdown the connection */
    public void cancel() {
        try {
            mmSocket.close();
        } catch (IOException e) { }
    }
}
}

multiplayer_bluetooth.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Challenge player"/>

    <ListView
        android:id="@+id/lv_paired_devices"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1">
    </ListView>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Make sure Device is paired"/>

</LinearLayout>

How can I use Google's Roboto font on a website?

The src refers directly to the font files, therefore if you place all of them on /media/fonts/roboto you should refer to them in your main.css like this: src: url('../fonts/roboto/Roboto-ThinItalic-webfont.eot');

The .. goes one folder up, which means you're referring to the media folder if the main.css is in the /media/css folder.

You have to use ../fonts/roboto/ in all url references in the CSS (and be sure that the files are in this folder and not in subdirectories, such as roboto_black_macroman).

Basically (answering to your questions):

I have css in my media/css/main.css url. So where do i need to put that folder

You can leave it there, but be sure to use src: url('../fonts/roboto/

Do i need to extract all eot,svg etc from all sub folder and put in fonts folder

If you want to refer to those files directly (without placing the subdirectories in your CSS code), then yes.

Do i need to create css file fonts.css and include in my base template file

Not necessarily, you can just include that code in your main.css. But it's a good practice to separate fonts from your customized CSS.

Here's an example of a fonts LESS/CSS file I use:

@ttf: format('truetype');

@font-face {
  font-family: 'msb';
  src: url('../font/msb.ttf') @ttf;
}
.msb {font-family: 'msb';}

@font-face {
  font-family: 'Roboto';
  src: url('../font/Roboto-Regular.ttf') @ttf;
}
.rb {font-family: 'Roboto';}
@font-face {
  font-family: 'Roboto Black';
  src: url('../font/Roboto-Black.ttf') @ttf;
}
.rbB {font-family: 'Roboto Black';}
@font-face {
  font-family: 'Roboto Light';
  src: url('../font/Roboto-Light.ttf') @ttf;
}
.rbL {font-family: 'Roboto Light';}

(In this example I'm only using the ttf) Then I use @import "fonts"; in my main.less file (less is a CSS preprocessor, it makes things like this a little bit easier)

Why isn't sizeof for a struct equal to the sum of sizeof of each member?

This is because of padding added to satisfy alignment constraints. Data structure alignment impacts both performance and correctness of programs:

Mis-aligned access might be a hard error (often SIGBUS).
Mis-aligned access might be a soft error.
- Either corrected in hardware, for a modest performance-degradation.
- Or corrected by emulation in software, for a severe performance-degradation.
- In addition, atomicity and other concurrency-guarantees might be broken, leading to subtle errors.

Here's an example using typical settings for an x86 processor (all used 32 and 64 bit modes):

struct X
{
    short s; /* 2 bytes */
             /* 2 padding bytes */
    int   i; /* 4 bytes */
    char  c; /* 1 byte */
             /* 3 padding bytes */
};

struct Y
{
    int   i; /* 4 bytes */
    char  c; /* 1 byte */
             /* 1 padding byte */
    short s; /* 2 bytes */
};

struct Z
{
    int   i; /* 4 bytes */
    short s; /* 2 bytes */
    char  c; /* 1 byte */
             /* 1 padding byte */
};

const int sizeX = sizeof(struct X); /* = 12 */
const int sizeY = sizeof(struct Y); /* = 8 */
const int sizeZ = sizeof(struct Z); /* = 8 */

One can minimize the size of structures by sorting members by alignment (sorting by size suffices for that in basic types) (like structure Z in the example above).

IMPORTANT NOTE: Both the C and C++ standards state that structure alignment is implementation-defined. Therefore each compiler may choose to align data differently, resulting in different and incompatible data layouts. For this reason, when dealing with libraries that will be used by different compilers, it is important to understand how the compilers align data. Some compilers have command-line settings and/or special #pragma statements to change the structure alignment settings.

How to get first record in each group using Linq

    var res = from element in list
              group element by element.F1
                  into groups
                  select groups.OrderBy(p => p.F2).First();

How to initialize struct?

Your struct can have methods and properties... why not try

public struct MyStruct { 
    public string s;
    public int length { return s.Length; }
}

Correction @Guffa's answer shows that it is possible... more info here: http://www.codeproject.com/KB/cs/Csharp_implicit_operator.aspx

how to pass parameters to query in SQL (Excel)

It depends on the database to which you're trying to connect, the method by which you created the connection, and the version of Excel that you're using. (Also, most probably, the version of the relevant ODBC driver on your computer.)

The following examples are using SQL Server 2008 and Excel 2007, both on my local machine.

When I used the Data Connection Wizard (on the Data tab of the ribbon, in the Get External Data section, under From Other Sources), I saw the same thing that you did: the Parameters button was disabled, and adding a parameter to the query, something like select field from table where field2 = ?, caused Excel to complain that the value for the parameter had not been specified, and the changes were not saved.

When I used Microsoft Query (same place as the Data Connection Wizard), I was able to create parameters, specify a display name for them, and enter values each time the query was run. Bringing up the Connection Properties for that connection, the Parameters... button is enabled, and the parameters can be modified and used as I think you want.

I was also able to do this with an Access database. It seems reasonable that Microsoft Query could be used to create parameterized queries hitting other types of databases, but I can't easily test that right now.

MAMP mysql server won't start. No mysql processes are running

The easiest solution: quit MAMP and remove the log files from MAMP/db/mysql directory [ib_logfile0, ib_logfile1] and restart MAMP. For more visit http://juanfra.me/2013/01/mysql-not-starting-mamp-fix/

How many bits or bytes are there in a character?

It depends what is the character and what encoding it is in:

An ASCII character in 8-bit ASCII encoding is 8 bits (1 byte), though it can fit in 7 bits.
An ISO-8895-1 character in ISO-8859-1 encoding is 8 bits (1 byte).
A Unicode character in UTF-8 encoding is between 8 bits (1 byte) and 32 bits (4 bytes).
A Unicode character in UTF-16 encoding is between 16 (2 bytes) and 32 bits (4 bytes), though most of the common characters take 16 bits. This is the encoding used by Windows internally.
A Unicode character in UTF-32 encoding is always 32 bits (4 bytes).
An ASCII character in UTF-8 is 8 bits (1 byte), and in UTF-16 - 16 bits.
The additional (non-ASCII) characters in ISO-8895-1 (0xA0-0xFF) would take 16 bits in UTF-8 and UTF-16.

That would mean that there are between 0.03125 and 0.125 characters in a bit.

How to get everything after a certain character?

Here is the method by using explode:

$text = explode('_', '233718_This_is_a_string', 2)[1]; // Returns This_is_a_string

or:

$text = @end((explode('_', '233718_This_is_a_string', 2)));

By specifying 2 for the limit parameter in explode(), it returns array with 2 maximum elements separated by the string delimiter. Returning 2nd element ([1]), will give the rest of string.

Here is another one-liner by using strpos (as suggested by @flu):

$needle = '233718_This_is_a_string';
$text = substr($needle, (strpos($needle, '_') ?: -1) + 1); // Returns This_is_a_string

How to plot a very simple bar chart (Python, Matplotlib) using input *.txt file?

You're talking about histograms, but this doesn't quite make sense. Histograms and bar charts are different things. An histogram would be a bar chart representing the sum of values per year, for example. Here, you just seem to be after bars.

Here is a complete example from your data that shows a bar of for each required value at each date:

import pylab as pl
import datetime

data = """0 14-11-2003
1 15-03-1999
12 04-12-2012
33 09-05-2007
44 16-08-1998
55 25-07-2001
76 31-12-2011
87 25-06-1993
118 16-02-1995
119 10-02-1981
145 03-05-2014"""

values = []
dates = []

for line in data.split("\n"):
    x, y = line.split()
    values.append(int(x))
    dates.append(datetime.datetime.strptime(y, "%d-%m-%Y").date())

fig = pl.figure()
ax = pl.subplot(111)
ax.bar(dates, values, width=100)
ax.xaxis_date()

You need to parse the date with strptime and set the x-axis to use dates (as described in this answer).

If you're not interested in having the x-axis show a linear time scale, but just want bars with labels, you can do this instead:

fig = pl.figure()
ax = pl.subplot(111)
ax.bar(range(len(dates)), values)

EDIT: Following comments, for all the ticks, and for them to be centred, pass the range to set_ticks (and move them by half the bar width):

fig = pl.figure()
ax = pl.subplot(111)
width=0.8
ax.bar(range(len(dates)), values, width=width)
ax.set_xticks(np.arange(len(dates)) + width/2)
ax.set_xticklabels(dates, rotation=90)

Why would you use String.Equals over ==?

I've just been banging my head against a wall trying to solve a bug because I read this page and concluded there was no meaningful difference when in practice there is so I'll post this link here in case anyone else finds they get different results out of == and equals.

Object == equality fails, but .Equals succeeds. Does this make sense?

string a = "x";
string b = new String(new []{'x'});

Console.WriteLine("x == x " + (a == b));//True
Console.WriteLine("object x == x " + ((object)a == (object)b));//False
Console.WriteLine("x equals x " + (a.Equals(b)));//True
Console.WriteLine("object x equals x " + (((object)a).Equals((object)b)));//True

How do I get a file's last modified time in Perl?

You could use stat() or the File::Stat module.

perldoc -f stat

Unable to auto-detect email address

This problem has very simple solution. Just open your SmartGit, then go to Repository option(On top left), then go to settings. It will open a dialog box of Repository Settings. Now, click on Commit TAB and write your UserName and EmailId which you give on BitBucke website. Now click ok and again try to Commit and it works fine now.

How do I add a simple onClick event handler to a canvas element?

I recommand the following article : Hit Region Detection For HTML5 Canvas And How To Listen To Click Events On Canvas Shapes which goes through various situations.

However, it does not cover the addHitRegion API, which must be the best way (using math functions and/or comparisons is quite error prone). This approach is detailed on developer.mozilla

Working copy locked error in tortoise svn while committing

I managed to lock myself out of a file in svn - don't know how - but when I tried (re)-getting the lock (Tortoise was showing the "Get Lock" option for the file), it complained that already had the lock. I tried deleting the file and committing the directory change - same result. I tried CleanUp (including refreshing the overlay), but that failed too.

The solution was to go into the Tortoise repo-browser, find the file and use the break lock function.

CSS: Set Div height to 100% - Pixels

Negative margins of course!

HTML

<div id="header">
    <h1>Header Text</h1>
</div>
<div id="wrapper">
    <div id="content">
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur 
        ullamcorper velit aliquam dolor dapibus interdum sed in dolor. Phasellus 
        vel quam et quam congue sodales.
    </div>
</div>

CSS

#header
{
    height: 111px;
    margin-top: 0px;
}
#wrapper
{
    margin-bottom: 0px;
    margin-top: -111px;
    height: 100%;
    position:relative;
    z-index:-1;
}
#content
{
    margin-top: 111px;
    padding: 0.5em;
}

Razor HtmlHelper Extensions (or other namespaces for views) Not Found

As the accepted answer suggests you can add "using" to all views by adding to section of config file.

But for a single view you could just use

@using SomeNamespace.Extensions

1064 error in CREATE TABLE ... TYPE=MYISAM

CREATE TABLE `admnih` (
  `id` int(255) NOT NULL auto_increment,
  `asim` varchar(255) NOT NULL default '',
  `brid` varchar(255) NOT NULL default '',
  `rwtbah` int(1) NOT NULL default '0',
  `esmmwkeh` varchar(255) NOT NULL default '',
  `mrwr` varchar(255) NOT NULL default '',
  `tid` int(255) NOT NULL default '0',
  `alksmfialdlil` int(255) NOT NULL default '0',
  `tariktsjil` varchar(255) NOT NULL default '',
  `aimwke` varchar(255) NOT NULL default '',
  `twkie` text NOT NULL,
  `rwtbahkasah` int(255) NOT NULL default '0',
  PRIMARY KEY  (`id`)
) TYPE=MyISAM AUTO_INCREMENT=2 ;

Convert array to JSON

The shortest way I know to generate valid json from array of integers is

let json = `[${cars}]`

for more general object/array use JSON.stringify(cars) (for object with circular references use this)

_x000D_

let cars = [1,2,3]; cars.push(4,5,6);

let json = `[${cars}]`;

console.log(json);
console.log(JSON.parse(json)); // json validation

_x000D_

Install Qt on Ubuntu

In Ubuntu 18.04 the QtCreator examples and API docs missing, This is my way to solve this problem, should apply to almost every Ubuntu release.

For QtCreator and Examples and API Docs:

sudo apt install `apt-cache search 5-examples | grep qt | grep example | awk '{print $1 }' | xargs `

sudo apt install `apt-cache search 5-doc | grep "Qt 5 " | awk '{print $1}' | xargs`

sudo apt-get install build-essential qtcreator qt5-default

If something is also missing, then:

sudo apt install `apt-cache search qt | grep 5- | grep ^qt | awk '{print $1}' | xargs `

Hope to be helpful.

Also posted in Ask Ubuntu: https://askubuntu.com/questions/450983/ubuntu-14-04-qtcreator-qt5-examples-missing

How to load property file from classpath?

If you use the static method and load the properties file from the classpath folder so you can use the below code :

//load a properties file from class path, inside static method
Properties prop = new Properties();
prop.load(Classname.class.getClassLoader().getResourceAsStream("foo.properties"));

Shell script to set environment variables

You need to run the script as source or the shorthand .

source ./myscript.sh

. ./myscript.sh

This will run within the existing shell, ensuring any variables created or modified by the script will be available after the script completes.

Running the script just using the filename will execute the script in a separate subshell.

Android and setting alpha for (image) view alpha

The alpha can be set along with the color using the following hex format #ARGB or #AARRGGBB. See http://developer.android.com/guide/topics/resources/color-list-resource.html

Launch custom android application from android browser

As of 15/06/2019

what I did is include all four possibilities to open url.

i.e, with http / https and 2 with www in prefix and 2 without www

and by using this my app launches automatically now without asking me to choose a browser and other option.

<intent-filter android:autoVerify="true">
    <action android:name="android.intent.action.VIEW" />
    <category android:name="android.intent.category.DEFAULT" />
    <category android:name="android.intent.category.BROWSABLE" />

    <data android:scheme="https" android:host="example.in" />
    <data android:scheme="https" android:host="www.example.in" />
    <data android:scheme="http" android:host="example.in" />
    <data android:scheme="http" android:host="www.example.in" />

</intent-filter>

How do I resolve a TesseractNotFoundError?

Just run these command if you are using linux,

sudo apt update
sudo apt install tesseract-ocr
sudo apt install libtesseract-dev

then run this,

python -m pip install tesseract tesseract-ocr pytesseract

Why does npm install say I have unmet dependencies?

The above answers didn't help me fully even after deleteting node_modules directory.

Below command helped me finally:

npm config set registry http://registry.npmjs.org/

Note that this pulls node modules over an insecure HTTP connection.

Src: https://stackoverflow.com/a/13119867/4082503

foreach vs someList.ForEach(){}

For fun, I popped List into reflector and this is the resulting C#:

public void ForEach(Action<T> action)
{
    if (action == null)
    {
        ThrowHelper.ThrowArgumentNullException(ExceptionArgument.match);
    }
    for (int i = 0; i < this._size; i++)
    {
        action(this._items[i]);
    }
}

Similarly, the MoveNext in Enumerator which is what is used by foreach is this:

public bool MoveNext()
{
    if (this.version != this.list._version)
    {
        ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_EnumFailedVersion);
    }
    if (this.index < this.list._size)
    {
        this.current = this.list._items[this.index];
        this.index++;
        return true;
    }
    this.index = this.list._size + 1;
    this.current = default(T);
    return false;
}

The List.ForEach is much more trimmed down than MoveNext - far less processing - will more likely JIT into something efficient..

In addition, foreach() will allocate a new Enumerator no matter what. The GC is your friend, but if you're doing the same foreach repeatedly, this will make more throwaway objects, as opposed to reusing the same delegate - BUT - this is really a fringe case. In typical usage you will see little or no difference.

git: 'credential-cache' is not a git command

From a blog I found:

"This [git-credential-cache] doesn’t work for Windows systems as git-credential-cache communicates through a Unix socket."

Git for Windows

Since msysgit has been superseded by Git for Windows, using Git for Windows is now the easiest option. Some versions of the Git for Windows installer (e.g. 2.7.4) have a checkbox during the install to enable the Git Credential Manager. Here is a screenshot:

Still using msysgit? For msysgit versions 1.8.1 and above

The wincred helper was added in msysgit 1.8.1. Use it as follows:

git config --global credential.helper wincred

For msysgit versions older than 1.8.1

First, download git-credential-winstore and install it in your git bin directory.

Next, make sure that the directory containing git.cmd is in your Path environment variable. The default directory for this is C:\Program Files (x86)\Git\cmd on a 64-bit system or C:\Program Files\Git\cmd on a 32-bit system. An easy way to test this is to launch a command prompt and type git. If you don't get a list of git commands, then it's not set up correctly.

Finally, launch a command prompt and type:

git config --global credential.helper winstore

Or you can edit your .gitconfig file manually:

[credential]
    helper = winstore

Once you've done this, you can manage your git credentials through Windows Credential Manager which you can pull up via the Windows Control Panel.

Java using enum with switch statement

enumerations accessing is very simple in switch case

private TYPE currentView;

//declaration of enum 
public enum TYPE {
        FIRST, SECOND, THIRD
    };

//handling in switch case
switch (getCurrentView())
        {
        case FIRST:
            break;
        case SECOND:
            break;
        case THIRD:
            break;
        }

//getter and setter of the enum
public void setCurrentView(TYPE currentView) {
        this.currentView = currentView;
    }

    public TYPE getCurrentView() {
        return currentView;
    }

//usage of setting the enum 
setCurrentView(TYPE.FIRST);

avoid the accessing of TYPE.FIRST.ordinal() it is not recommended always

How to check status of PostgreSQL server Mac OS X

The pg_ctl status command suggested in other answers checks that the postmaster process exists and if so reports that it's running. That doesn't necessarily mean it is ready to accept connections or execute queries.

It is better to use another method like using psql to run a simple query and checking the exit code, e.g. psql -c 'SELECT 1', or use pg_isready to check the connection status.

Java best way for string find and replace?

One possibility, reducing the longer form before expanding all:

string.replaceAll("Milan Vasic", "Milan").replaceAll("Milan", "Milan Vasic")

Another way, treating Vasic as optional:

string.replaceAll("Milan( Vasic)?", "Milan Vasic")

Others have described solutions based on lookahead or alternation.

foreach loop in angularjs

The angular.forEach() will iterate through your json object.

First iteration,

key = 0, value = { "name" : "Thomas", "password" : "thomasTheKing"}

Second iteration,

key = 1, value = { "name" : "Linda", "password" : "lindatheQueen" }

To get the value of your name, you can use value.name or value["name"]. Same with your password, you use value.password or value["password"].

The code below will give you what you want:

   angular.forEach(json, function (value, key)
         {
                //console.log(key);
                //console.log(value);
                if (value.password == "thomasTheKing") {
                    console.log("username is thomas");
                }
         });

Javascript string replace with regex to strip off illegal characters

You need to wrap them all in a character class. The current version means replace this sequence of characters with an empty string. When wrapped in square brackets it means replace any of these characters with an empty string.

var cleanString = dirtyString.replace(/[\|&;\$%@"<>\(\)\+,]/g, "");

Fastest JavaScript summation

Based on this test (for-vs-forEach-vs-reduce) and this (loops)

I can say that:

1# Fastest: for loop

var total = 0;

for (var i = 0, n = array.length; i < n; ++i)
{
    total += array[i];
}

2# Aggregate

For you case you won't need this, but it adds a lot of flexibility.

Array.prototype.Aggregate = function(fn) {
    var current
        , length = this.length;

    if (length == 0) throw "Reduce of empty array with no initial value";

    current = this[0];

    for (var i = 1; i < length; ++i)
    {
        current = fn(current, this[i]);
    }

    return current;
};

Usage:

var total = array.Aggregate(function(a,b){ return a + b });

Inconclusive methods

Then comes forEach and reduce which have almost the same performance and varies from browser to browser, but they have the worst performance anyway.

After submitting a POST form open a new window showing the result

Simplest working solution for flow window (tested at Chrome):

<form action='...' method=post target="result" onsubmit="window.open('','result','width=800,height=400');">
    <input name="..">
    ....
</form>

How can I make my website's background transparent without making the content (images & text) transparent too?

I think the simplest solution, rather than making the body element partially transparent, would be to add an extra div to hold the background, and change the opacity there, instead.

So you would add a div like:

<div id="background"></div>

And move your body element's background CSS to it, as well as some additional positioning properties, like this:

#background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('images/background.jpg');
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: 100%;
    opacity: 0.8;
    filter:alpha(opacity=80);
}

Here's an example: http://jsfiddle.net/nbVg4/4/

Spring RestTemplate GET with parameters

I am providing a code snippet of RestTemplate GET method with path param example

public ResponseEntity<String> getName(int id) {
    final String url = "http://localhost:8080/springrestexample/employee/name?id={id}";
    Map<String, String> params = new HashMap<String, String>();
    params.put("id", id);
    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_JSON);
    HttpEntity request = new HttpEntity(headers);
    ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.GET, String.class, params);
    return response;
}

AngularJS directive does not update on scope variable changes

I've found a much better solution:

app.directive('layout', function(){
    var settings = {
        restrict: 'E',
        transclude: true,
        templateUrl: function(element, attributes){
            var layoutName = (angular.isDefined(attributes.name)) ? attributes.name : 'Default';
            return constants.pathLayouts + layoutName + '.html';
        }
    }
    return settings;
});

The only disadvantage I see currently, is the fact that transcluded templates got their own scope. They get the values from their parents, but instead of change the value in the parent, the value get stored in an own, new child-scope. To avoid this, I am now using $parent.whatever instead of whatever.

Example:

<layout name="Default">
    <layout name="AnotherNestedLayout">
        <label>Whatever:</label>
        <input type="text" ng-model="$parent.whatever">
    </layout>
</layout>

removing table border

Use table style Border-collapse at the table level

How to download the latest artifact from Artifactory repository?

You can use the REST-API's "Item last modified". From the docs, it retuns something like this:

GET /api/storage/libs-release-local/org/acme?lastModified
{
"uri": "http://localhost:8081/artifactory/api/storage/libs-release-local/org/acme/foo/1.0-SNAPSHOT/foo-1.0-SNAPSHOT.pom",
"lastModified": ISO8601
}

Example:

# Figure out the URL of the last item modified in a given folder/repo combination
url=$(curl \
    -H 'X-JFrog-Art-Api: XXXXXXXXXXXXXXXXXXXX' \
    'http://<artifactory-base-url>/api/storage/<repo>/<folder>?lastModified'  | jq -r '.uri')
# Figure out the name of the downloaded file
downloaded_filename=$(echo "${url}" | sed -e 's|[^/]*/||g')
# Download the file
curl -L -O "${url}"

Subtract days, months, years from a date in JavaScript

I implemented a function similar to the momentjs method subtract.

- If you use Javascript

function addDate(dt, amount, dateType) {
  switch (dateType) {
    case 'days':
      return dt.setDate(dt.getDate() + amount) && dt;
    case 'weeks':
      return dt.setDate(dt.getDate() + (7 * amount)) && dt;
    case 'months':
      return dt.setMonth(dt.getMonth() + amount) && dt;
    case 'years':
      return dt.setFullYear( dt.getFullYear() + amount) && dt;
  }
}

example:

let dt = new Date();
dt = addDate(dt, -1, 'months');// use -1 to subtract

- If you use Typescript:

export enum dateAmountType {
  DAYS,
  WEEKS,
  MONTHS,
  YEARS,
}

export function addDate(dt: Date, amount: number, dateType: dateAmountType): Date {
  switch (dateType) {
    case dateAmountType.DAYS:
      return dt.setDate(dt.getDate() + amount) && dt;
    case dateAmountType.WEEKS:
      return dt.setDate(dt.getDate() + (7 * amount)) && dt;
    case dateAmountType.MONTHS:
      return dt.setMonth(dt.getMonth() + amount) && dt;
    case dateAmountType.YEARS:
      return dt.setFullYear( dt.getFullYear() + amount) && dt;
  }
}

example:

let dt = new Date();
dt = addDate(dt, -1, 'months'); // use -1 to subtract

Optional (unit-tests)

I also made some unit-tests for this function using Jasmine:

  it('addDate() should works properly', () => {
    for (const test of [
      { amount: 1,  dateType: dateAmountType.DAYS,   expect: '2020-04-13'},
      { amount: -1, dateType: dateAmountType.DAYS,   expect: '2020-04-11'},
      { amount: 1,  dateType: dateAmountType.WEEKS,  expect: '2020-04-19'},
      { amount: -1, dateType: dateAmountType.WEEKS,  expect: '2020-04-05'},
      { amount: 1,  dateType: dateAmountType.MONTHS, expect: '2020-05-12'},
      { amount: -1, dateType: dateAmountType.MONTHS, expect: '2020-03-12'},
      { amount: 1,  dateType: dateAmountType.YEARS,  expect: '2021-04-12'},
      { amount: -1, dateType: dateAmountType.YEARS,  expect: '2019-04-12'},
    ]) {
      expect(formatDate(addDate(new Date('2020-04-12'), test.amount, test.dateType))).toBe(test.expect);
    }

  });

To use this test you need this function:

// get format date as 'YYYY-MM-DD'
export function formatDate(date: Date): string {
  const d     = new Date(date);
  let month   = '' + (d.getMonth() + 1);
  let day     = '' + d.getDate();
  const year  = d.getFullYear();

  if (month.length < 2)  {
    month = '0' + month;
  }
  if (day.length < 2) {
    day = '0' + day;
  }

  return [year, month, day].join('-');
}

Converting array to list in Java

It seems little late but here are my two cents. We cannot have List<int> as int is a primitive type so we can only have List<Integer>.

Java 8 (int array)

int[] ints = new int[] {1,2,3,4,5};
List<Integer> list11 =Arrays.stream(ints).boxed().collect(Collectors.toList());

Java 8 and below (Integer array)

Integer[] integers = new Integer[] {1,2,3,4,5};
List<Integer> list21 =  Arrays.asList(integers); // returns a fixed-size list backed by the specified array.
List<Integer> list22 = new ArrayList<>(Arrays.asList(integers)); // good
List<Integer> list23 = Arrays.stream(integers).collect(Collectors.toList()); //Java 8 only

Need ArrayList and not List?

In case we want a specific implementation of List e.g. ArrayList then we can use toCollection as:

ArrayList<Integer> list24 = Arrays.stream(integers)
                          .collect(Collectors.toCollection(ArrayList::new));

Why list21 cannot be structurally modified?

When we use Arrays.asList the size of the returned list is fixed because the list returned is not java.util.ArrayList, but a private static class defined inside java.util.Arrays. So if we add or remove elements from the returned list, an UnsupportedOperationException will be thrown. So we should go with list22 when we want to modify the list. If we have Java8 then we can also go with list23.

To be clear list21 can be modified in sense that we can call list21.set(index,element) but this list may not be structurally modified i.e. cannot add or remove elements from the list. You can also check this answer of mine for more explanation.

If we want an immutable list then we can wrap it as:

List<Integer> list22 = Collections.unmodifiableList(Arrays.asList(integers));

Another point to note is that the method Collections.unmodifiableList returns an unmodifiable view of the specified list. An unmodifiable view collection is a collection that is unmodifiable and is also a view onto a backing collection. Note that changes to the backing collection might still be possible, and if they occur, they are visible through the unmodifiable view.

We can have a truly immutable list in Java 9 and 10.

Truly Immutable list

Java 9:

String[] objects = {"Apple", "Ball", "Cat"};
List<String> objectList = List.of(objects);

Java 10 (Truly Immutable list):

We can use List.of introduced in Java 9. Also other ways:

List.copyOf(Arrays.asList(integers))
Arrays.stream(integers).collect(Collectors.toUnmodifiableList());

how to install python distutils

If you are unable to install with either of these:

sudo apt-get install python-distutils
sudo apt-get install python3-distutils

Try this instead:

sudo apt-get install python-distutils-extra

Ref: https://groups.google.com/forum/#!topic/beagleboard/RDlTq8sMxro

Matrix Transpose in Python

_x000D_

def transpose(m):_x000D_
    return(list(map(list,list(zip(*m)))))

_x000D_

`This function will return the transpose

What does the SQL Server Error "String Data, Right Truncation" mean and how do I fix it?

I was facing the same issue. So, i created a stored Procedure and defined the size like @FromDate datetime, @ToDate datetime, @BL varchar(50)

After defining the size in @BL varchar(50), i did not face any problem. Now it is working fine

How can you run a command in bash over and over until success?

You can use an infinite loop to achieve this:

while true
do
  read -p "Enter password" passwd
  case "$passwd" in
    <some good condition> ) break;;
  esac
done

How to select the last record from MySQL table using SQL syntax

You could also do something like this:

SELECT tb1.* FROM Table tb1 WHERE id = (SELECT MAX(tb2.id) FROM Table tb2);

Its useful when you want to make some joins.

Android. Fragment getActivity() sometimes returns null

I've been battling this kind of problem for a while, and I think I've come up with a reliable solution.

It's pretty difficult to know for sure that this.getActivity() isn't going to return null for a Fragment, especially if you're dealing with any kind of network behaviour which gives your code ample time to withdraw Activity references.

In the solution below, I declare a small management class called the ActivityBuffer. Essentially, this class deals with maintaining a reliable reference to an owning Activity, and promising to execute Runnables within a valid Activity context whenever there's a valid reference available. The Runnables are scheduled for execution on the UI Thread immediately if the Context is available, otherwise execution is deferred until that Context is ready.

/** A class which maintains a list of transactions to occur when Context becomes available. */
public final class ActivityBuffer {

    /** A class which defines operations to execute once there's an available Context. */
    public interface IRunnable {
        /** Executes when there's an available Context. Ideally, will it operate immediately. */
        void run(final Activity pActivity);
    }

    /* Member Variables. */
    private       Activity        mActivity;
    private final List<IRunnable> mRunnables;

    /** Constructor. */
    public ActivityBuffer() {
        // Initialize Member Variables.
        this.mActivity  = null;
        this.mRunnables = new ArrayList<IRunnable>();
    }

    /** Executes the Runnable if there's an available Context. Otherwise, defers execution until it becomes available. */
    public final void safely(final IRunnable pRunnable) {
        // Synchronize along the current instance.
        synchronized(this) {
            // Do we have a context available?
            if(this.isContextAvailable()) {
                // Fetch the Activity.
                final Activity lActivity = this.getActivity();
                // Execute the Runnable along the Activity.
                lActivity.runOnUiThread(new Runnable() { @Override public final void run() { pRunnable.run(lActivity); } });
            }
            else {
                // Buffer the Runnable so that it's ready to receive a valid reference.
                this.getRunnables().add(pRunnable);
            }
        }
    }

    /** Called to inform the ActivityBuffer that there's an available Activity reference. */
    public final void onContextGained(final Activity pActivity) {
        // Synchronize along ourself.
        synchronized(this) {
            // Update the Activity reference.
            this.setActivity(pActivity);
            // Are there any Runnables awaiting execution?
            if(!this.getRunnables().isEmpty()) {
                // Iterate the Runnables.
                for(final IRunnable lRunnable : this.getRunnables()) {
                    // Execute the Runnable on the UI Thread.
                    pActivity.runOnUiThread(new Runnable() { @Override public final void run() {
                        // Execute the Runnable.
                        lRunnable.run(pActivity);
                    } });
                }
                // Empty the Runnables.
                this.getRunnables().clear();
            }
        }
    }

    /** Called to inform the ActivityBuffer that the Context has been lost. */
    public final void onContextLost() {
        // Synchronize along ourself.
        synchronized(this) {
            // Remove the Context reference.
            this.setActivity(null);
        }
    }

    /** Defines whether there's a safe Context available for the ActivityBuffer. */
    public final boolean isContextAvailable() {
        // Synchronize upon ourself.
        synchronized(this) {
            // Return the state of the Activity reference.
            return (this.getActivity() != null);
        }
    }

    /* Getters and Setters. */
    private final void setActivity(final Activity pActivity) {
        this.mActivity = pActivity;
    }

    private final Activity getActivity() {
        return this.mActivity;
    }

    private final List<IRunnable> getRunnables() {
        return this.mRunnables;
    }

}

In terms of its implementation, we must take care to apply the life cycle methods to coincide with the behaviour described above by Pawan M:

public class BaseFragment extends Fragment {

    /* Member Variables. */
    private ActivityBuffer mActivityBuffer;

    public BaseFragment() {
        // Implement the Parent.
        super();
        // Allocate the ActivityBuffer.
        this.mActivityBuffer = new ActivityBuffer();
    }

    @Override
    public final void onAttach(final Context pContext) {
        // Handle as usual.
        super.onAttach(pContext);
        // Is the Context an Activity?
        if(pContext instanceof Activity) {
            // Cast Accordingly.
            final Activity lActivity = (Activity)pContext;
            // Inform the ActivityBuffer.
            this.getActivityBuffer().onContextGained(lActivity);
        }
    }

    @Deprecated @Override
    public final void onAttach(final Activity pActivity) {
        // Handle as usual.
        super.onAttach(pActivity);
        // Inform the ActivityBuffer.
        this.getActivityBuffer().onContextGained(pActivity);
    }

    @Override
    public final void onDetach() {
        // Handle as usual.
        super.onDetach();
        // Inform the ActivityBuffer.
        this.getActivityBuffer().onContextLost();
    }

    /* Getters. */
    public final ActivityBuffer getActivityBuffer() {
        return this.mActivityBuffer;
    }

}

Finally, in any areas within your Fragment that extends BaseFragment that you're untrustworthy about a call to getActivity(), simply make a call to this.getActivityBuffer().safely(...) and declare an ActivityBuffer.IRunnable for the task!

The contents of your void run(final Activity pActivity) are then guaranteed to execute along the UI Thread.

The ActivityBuffer can then be used as follows:

this.getActivityBuffer().safely(
  new ActivityBuffer.IRunnable() {
    @Override public final void run(final Activity pActivity) {
       // Do something with guaranteed Context.
    }
  }
);

Visual Studio 2015 is very slow

My Visual Studio 2015 RTM was also very slow using ReSharper 9.1.2, but it has worked fine since I upgraded to 9.1.3 (see ReSharper 9.1.3 to the Rescue). Perhaps a cue.

One more cue. A ReSharper 9.2 version was made available to:

refines integration with Visual Studio 2015 RTM, addressing issues discovered in versions 9.1.2 and 9.1.3

Lookup City and State by Zip Google Geocode Api

I found a couple of ways to do this with web based APIs. I think the US Postal Service would be the most accurate, since Zip codes are their thing, but Ziptastic looks much easier.

Using the US Postal Service HTTP/XML API

According to this page on the US Postal Service website which documents their XML based web API, specifically Section 4.0 (page 22) of this PDF document, they have a URL where you can send an XML request containing a 5 digit Zip Code and they will respond with an XML document containing the corresponding City and State.

According to their documentation, here's what you would send:

http://SERVERNAME/ShippingAPITest.dll?API=CityStateLookup&XML=<CityStateLookupRequest%20USERID="xxxxxxx"><ZipCode ID= "0"><Zip5>90210</Zip5></ZipCode></CityStateLookupRequest>

And here's what you would receive back:

<?xml version="1.0"?> 
<CityStateLookupResponse> 
    <ZipCode ID="0"> 
        <Zip5>90210</Zip5> 
        <City>BEVERLY HILLS</City> 
        <State>CA</State> 
    </ZipCode> 
</CityStateLookupResponse>

USPS does require that you register with them before you can use the API, but, as far as I could tell, there is no charge for access. By the way, their API has some other features: you can do Address Standardization and Zip Code Lookup, as well as the whole suite of tracking, shipping, labels, etc.

Using the Ziptastic HTTP/JSON API (no longer supported)

Update: As of August 13, 2017, Ziptastic is now a paid API and can be found here

This is a pretty new service, but according to their documentation, it looks like all you need to do is send a GET request to http://ziptasticapi.com, like so:

GET http://ziptasticapi.com/48867

And they will return a JSON object along the lines of:

{"country": "US", "state": "MI", "city": "OWOSSO"}

Indeed, it works. You can test this from a command line by doing something like:

curl http://ziptasticapi.com/48867

What's the difference between Docker Compose vs. Dockerfile

Dockerfile is a file that contains text commands to assemble an image.

Docker compose is used to run a multi-container environment.

In your specific scenario, if you have multiple services for each technology you mentioned (service 1 using reddis, service 2 using rabbit mq etc), then you can have a Dockerfile for each of the services and a common docker-compose.yml to run all the "Dockerfile" as containers.

If you want them all in a single service, docker-compose will be a viable option.

Android fade in and fade out with ImageView

This is probably the best solution you'll get. Simple and Easy. I learned it on udemy. Suppose you have two images having image id's id1 and id2 respectively and currently the image view is set as id1 and you want to change it to the other image everytime someone clicks in. So this is the basic code in MainActivity.java File

int clickNum=0;
public void click(View view){
clickNum++;
ImageView a=(ImageView)findViewById(R.id.id1);
ImageView b=(ImageView)findViewById(R.id.id2);
if(clickNum%2==1){
  a.animate().alpha(0f).setDuration(2000); //alpha controls the transpiracy
}
else if(clickNum%2==0){
  b.animate().alpha(0f).setDuration(2000); //alpha controls the transpiracy
}

}

I hope this will surely help

Cannot use object of type stdClass as array?

The function json_decode() returns an object by default.

You can access the data like this:

var_dump($result->context);

If you have identifiers like from-date (the hyphen would cause a PHP error when using the above method) you have to write:

var_dump($result->{'from-date'});

If you want an array you can do something like this:

$result = json_decode($json, true);

Or cast the object to an array:

$result = (array) json_decode($json);

What is HEAD in Git?

Assuming it is not a special case called "detached HEAD", then, as stated in the O'Reilly Git book, 2nd edtion, p.69, HEAD means:

HEAD always refers to the most recent commit on the current branch. When you change branches, HEAD is updated to refer to the new branch’s latest commit.

HEAD is the "tip" of the current branch.

Note that we can use HEAD to refer to the most recent commit, and use HEAD~ as the commit before the tip, and HEAD~~ or HEAD~2 as the commit even earlier, and so forth.

How to set cookie value with AJAX request?

Basically, ajax request as well as synchronous request sends your document cookies automatically. So, you need to set your cookie to document, not to request. However, your request is cross-domain, and things became more complicated. Basing on this answer, additionally to set document cookie, you should allow its sending to cross-domain environment:

type: "GET",    
url: "http://example.com",
cache: false,
// NO setCookies option available, set cookie to document
//setCookies: "lkfh89asdhjahska7al446dfg5kgfbfgdhfdbfgcvbcbc dfskljvdfhpl",
crossDomain: true,
dataType: 'json',
xhrFields: {
    withCredentials: true
},
success: function (data) {
    alert(data);
});

Use string contains function in oracle SQL query

By lines I assume you mean rows in the table person. What you're looking for is:

select p.name
from   person p
where  p.name LIKE '%A%'; --contains the character 'A'

The above is case sensitive. For a case insensitive search, you can do:

select p.name
from   person p
where  UPPER(p.name) LIKE '%A%'; --contains the character 'A' or 'a'

For the special character, you can do:

select p.name
from   person p
where  p.name LIKE '%'||chr(8211)||'%'; --contains the character chr(8211)

The LIKE operator matches a pattern. The syntax of this command is described in detail in the Oracle documentation. You will mostly use the % sign as it means match zero or more characters.

Excel - find cell with same value in another worksheet and enter the value to the left of it

Assuming employee numbers are in the first column and their names are in the second:

=VLOOKUP(A1, Sheet2!A:B, 2,false)

Mobile website "WhatsApp" button to send message to a specific number

WhatsApp is now providing a much simpler API https://wa.me/ This isn't introducing any new features, just a simpler way to execute things. There's no need to check for user agent while implementing this API as it will also work with native apps as well as the web interface of whatsapp (web.whatsapp.com) on desktop.

This can be used in multiple use cases

A Click to chat button : Use https://wa.me/whatsappphonenumber to open a chat dialog with the specified whatsapp user. Please note that the whatsappphonenumber should be a valid whatsapp number in international format without leading zeros, '+', '-' and spaces. e.g. 15551234567

<a href="https://wa.me/15551234567">Whatsapp Me</a>
A Share this on whatsapp button : Use https://wa.me/?text=urlencodedtext to open a whatsapp contact selection dialog with a preset text. e.g.

<a href="https://wa.me/?text=I%20found%20a%20great%20website.%20Check%20out%20this%20link%20https%3A%2F%2Fwww.example.com%2F">Share on WhatsApp</a>
A Contact me button with prefilled text : A combination of the above two, Might be useful if you want to get a prefilled custom message from users landing on a particular page. Use format https://wa.me/whatsappphonenumber/?text=urlencodedtext

<a href="https://wa.me/15551234567?text=I%20am%20interested%20in%20your%20services.%20How%20to%20get%20started%3F">I am interested</a>

For official documentation visit https://faq.whatsapp.com/en/general/26000030

How to sum all values in a column in Jaspersoft iReport Designer?

iReports Custom Fields for columns (sum, average, etc)

Right-Click on Variables and click Create Variable
Click on the new variable

a. Notice the properties on the right
Rename the variable accordingly
Change the Value Class Name to the correct Data Type

a. You can search by clicking the 3 dots
Select the correct type of calculation
Change the Expression

a. Click the little icon

b. Select the column you are looking to do the calculation for

c. Click finish
Set Initial Value Expression to 0
Set the increment type to none
Leave Incrementer Factory Class Name blank
Set the Reset Type (usually report)
Drag a new Text Field to stage (Usually in Last Page Footer, or Column Footer)
Double Click the new Text Field
Clear the expression “Text Field”
Select the new variable
Click finish
Put the new text in a desirable position ?

Java method to swap primitives

Try this magic

public static <T> void swap(T a, T b) {
    try {
        Field[] fields = a.getClass().getDeclaredFields();
        for (Field field : fields) {
            field.setAccessible(true);
            Object temp = field.get(a);
            field.set(a, field.get(b));
            field.set(b, temp);
        }
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    }
}

And test it!

    System.out.println("a:" + a);
    System.out.println("b:" + b);
    swap(a,b);
    System.out.println("a:" + a);
    System.out.println("b:" + b);

Webclient / HttpWebRequest with Basic Authentication returns 404 not found for valid URL

This part of code worked fine for me:

        WebRequest request = WebRequest.Create(url);
        request.Method = WebRequestMethods.Http.Get;
        NetworkCredential networkCredential = new NetworkCredential(logon, password); // logon in format "domain\username"
        CredentialCache myCredentialCache = new CredentialCache {{new Uri(url), "Basic", networkCredential}};
        request.PreAuthenticate = true;
        request.Credentials = myCredentialCache;
        using (WebResponse response = request.GetResponse())
        {
            Console.WriteLine(((HttpWebResponse)response).StatusDescription);

            using (Stream dataStream = response.GetResponseStream())
            {
                using (StreamReader reader = new StreamReader(dataStream))
                {
                    string responseFromServer = reader.ReadToEnd();
                    Console.WriteLine(responseFromServer);
                }
            }
        }

Convert a list to a dictionary in Python

Something i find pretty cool, which is that if your list is only 2 items long:

ls = ['a', 'b']
dict([ls])
>>> {'a':'b'}

Remember, dict accepts any iterable containing an iterable where each item in the iterable must itself be an iterable with exactly two objects.

No @XmlRootElement generated by JAXB

After sruggling for two days I found the solution for the problem.You can use the ObjectFactory class to workaround for the classes which doesn't have the @XmlRootElement. ObjectFactory has overloaded methods to wrap it around the JAXBElement.

Method:1 does the simple creation of the object.

Method:2 will wrap the object with @JAXBElement.

Always use Method:2 to avoid javax.xml.bind.MarshalException - with linked exception missing an @XmlRootElement annotation.

Please find the sample code below

Method:1 does the simple creation of the object

public GetCountry createGetCountry() {
        return new GetCountry();
    }

Method:2 will wrap the object with @JAXBElement.

 @XmlElementDecl(namespace = "my/name/space", name = "getCountry")
 public JAXBElement<GetCountry> createGetCountry(GetCountry value) {
        return new JAXBElement<GetCountry>(_GetCountry_QNAME, GetCountry.class, null, value);
    }

Working code sample:

ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
WebServiceTemplate springWSTemplate = context.getBean(WebServiceTemplate.class);

GetCountry request = new GetCountry();
request.setGuid("test_guid");

JAXBElement<GetCountryResponse> jaxbResponse = (JAXBElement<GetCountryResponse>)springWSTemplate .marshalSendAndReceive(new ObjectFactory().createGetCountry(request));

GetCountryResponse response = jaxbResponse.getValue();

Does Notepad++ show all hidden characters?

Yes, it does. The way to enable this depends on your version of Notepad++. On newer versions you can use:

Menu View ? Show Symbol ? *Show All Characters`

Menu View ? Show Symbol ? Show White Space and TAB

(Thanks to bers' comment and bkaid's answers below for these updated locations.)

On older versions you can look for:

Menu View ? Show all characters

Menu View ? Show White Space and TAB

file_get_contents behind a proxy?

There's a similar post here: http://techpad.co.uk/content.php?sid=137 which explains how to do it.

function file_get_contents_proxy($url,$proxy){

    // Create context stream
    $context_array = array('http'=>array('proxy'=>$proxy,'request_fulluri'=>true));
    $context = stream_context_create($context_array);

    // Use context stream with file_get_contents
    $data = file_get_contents($url,false,$context);

    // Return data via proxy
    return $data;

}

Is there a /dev/null on Windows?

Jon Skeet is correct. Here is the Nul Device Driver page in the Windows Embedded documentation (I have no idea why it's not somewhere else...).

Here is another:

difference between System.out.println() and System.err.println()

System.out's main purpose is giving standard output.

System.err's main purpose is giving standard error.

Look at these

http://www.devx.com/tips/Tip/14698

http://wiki.eclipse.org/FAQ_Where_does_System.out_and_System.err_output_go%3F

Getting around the Max String size in a vba function?

This works and shows more than 255 characters in the message box.

Sub TestStrLength()
    Dim s As String
    Dim i As Integer

    s = ""
    For i = 1 To 500
        s = s & "1234567890"
    Next i

    MsgBox s
End Sub

The message box truncates the string to 1023 characters, but the string itself can be very large.

I would also recommend that instead of using fixed variables names with numbers (e.g. Var1, Var2, Var3, ... Var255) that you use an array. This is much shorter declaration and easier to use - loops.

Here's an example:

Sub StrArray()
Dim var(256) As Integer
Dim i As Integer
Dim s As String

For i = 1 To 256
    var(i) = i
Next i

s = "Tims_pet_Robot"
For i = 1 To 256
    s = s & " """ & var(i) & """"
Next i

    SecondSub (s)
End Sub

Sub SecondSub(s As String)
    MsgBox "String length = " & Len(s)
End Sub

Updated this to show that a string can be longer than 255 characters and used in a subroutine/function as a parameter that way. This shows that the string length is 1443 characters. The actual limit in VBA is 2GB per string.

Perhaps there is instead a problem with the API that you are using and that has a limit to the string (such as a fixed length string). The issue is not with VBA itself.

Ok, I see the problem is specifically with the Application.OnTime method itself. It is behaving like Excel functions in that they only accept strings that are up to 255 characters in length. VBA procedures and functions though do not have this limit as I have shown. Perhaps then this limit is imposed for any built-in Excel object method.

Update:
changed ...longer than 256 characters... to ...longer than 255 characters...

Binding Listbox to List<object> in WinForms

Pretending you are displaying a list of customer objects with "customerName" and "customerId" properties:

listBox.DataSource = customerListObject;
listBox.DataTextField = "customerName";
listBox.DataValueField = "customerId";
listBox.DataBind();

Edit: I know this works in asp.net - if you are doing a winforms app, it should be pretty similar (I hope...)

Is it possible to modify a string of char in C?

All are good answers explaining why you cannot modify string literals because they are placed in read-only memory. However, when push comes to shove, there is a way to do this. Check out this example:

#include <sys/mman.h>
#include <unistd.h>
#include <stddef.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

int take_me_back_to_DOS_times(const void *ptr, size_t len);

int main()
{
    const *data = "Bender is always sober.";
    printf("Before: %s\n", data);
    if (take_me_back_to_DOS_times(data, sizeof(data)) != 0)
        perror("Time machine appears to be broken!");
    memcpy((char *)data + 17, "drunk!", 6);
    printf("After: %s\n", data);

    return 0;
}

int take_me_back_to_DOS_times(const void *ptr, size_t len)
{
    int pagesize;
    unsigned long long pg_off;
    void *page;

    pagesize = sysconf(_SC_PAGE_SIZE);
    if (pagesize < 0)
        return -1;
    pg_off = (unsigned long long)ptr % (unsigned long long)pagesize;
    page = ((char *)ptr - pg_off);
    if (mprotect(page, len + pg_off, PROT_READ | PROT_WRITE | PROT_EXEC) == -1)
        return -1;
    return 0;
}

I have written this as part of my somewhat deeper thoughts on const-correctness, which you might find interesting (I hope :)).

Hope it helps. Good Luck!

What is the difference between the HashMap and Map objects in Java?

HashMap<String, Object> map1 = new HashMap<String, Object>();
Map<String, Object> map2 = new HashMap<String, Object>();

First of all Map is an interface it has different implementation like - HashMap, TreeHashMap, LinkedHashMap etc. Interface works like a super class for the implementing class. So according to OOP's rule any concrete class that implements Map is a Map also. That means we can assign/put any HashMap type variable to a Map type variable without any type of casting.

In this case we can assign map1 to map2 without any casting or any losing of data -

map2 = map1

How do I get the directory from a file's full path?

If you've definitely got an absolute path, use Path.GetDirectoryName(path).

If you might only get a relative name, use new FileInfo(path).Directory.FullName.

Note that Path and FileInfo are both found in the namespace System.IO.

Cannot delete or update a parent row: a foreign key constraint fails

When you create database or create tables

You should add that line at top script create database or table

SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=1;

Now you want to delete records from table? then you write as

SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=1;
DELETE FROM `jobs` WHERE `job_id` =1 LIMIT 1

Good luck!

Why do we have to override the equals() method in Java?

By default .equals() uses == identity function to compare which obviously doesn't work as the instances test1 and test2 are not the same. == only works with primitive data types like int or string. So you need to override it to make it work by comparing all the member variables of the Test class

/exclude in xcopy just for a file type

In my case I had to start a list of exclude extensions from the second line because xcopy ignored the first line.

Split / Explode a column of dictionaries into separate columns with pandas

>>> df

   Station ID                        Pollutants
0        8809  {"a": "46", "b": "3", "c": "12"}
1        8810   {"a": "36", "b": "5", "c": "8"}
2        8811              {"b": "2", "c": "7"}
3        8812                       {"c": "11"}
4        8813            {"a": "82", "c": "15"}

speed comparison for a large dataset of 10 million rows

>>> df = pd.concat([df]*100000).reset_index(drop=True)
>>> df = pd.concat([df]*20).reset_index(drop=True)
>>> print(df.shape)
(10000000, 2)

def apply_drop(df):
    return df.join(df['Pollutants'].apply(pd.Series)).drop('Pollutants', axis=1)  

def json_normalise_drop(df):
    return df.join(pd.json_normalize(df.Pollutants)).drop('Pollutants', axis=1)  

def tolist_drop(df):
    return df.join(pd.DataFrame(df['Pollutants'].tolist())).drop('Pollutants', axis=1)  

def vlues_tolist_drop(df):
    return df.join(pd.DataFrame(df['Pollutants'].values.tolist())).drop('Pollutants', axis=1)  

def pop_tolist(df):
    return df.join(pd.DataFrame(df.pop('Pollutants').tolist()))  

def pop_values_tolist(df):
    return df.join(pd.DataFrame(df.pop('Pollutants').values.tolist()))


>>> %timeit apply_drop(df.copy())
1 loop, best of 3: 53min 20s per loop
>>> %timeit json_normalise_drop(df.copy())
1 loop, best of 3: 54.9 s per loop
>>> %timeit tolist_drop(df.copy())
1 loop, best of 3: 6.62 s per loop
>>> %timeit vlues_tolist_drop(df.copy())
1 loop, best of 3: 6.63 s per loop
>>> %timeit pop_tolist(df.copy())
1 loop, best of 3: 5.99 s per loop
>>> %timeit pop_values_tolist(df.copy())
1 loop, best of 3: 5.94 s per loop

+---------------------+-----------+
| apply_drop          | 53min 20s |
| json_normalise_drop |    54.9 s |
| tolist_drop         |    6.62 s |
| vlues_tolist_drop   |    6.63 s |
| pop_tolist          |    5.99 s |
| pop_values_tolist   |    5.94 s |
+---------------------+-----------+

df.join(pd.DataFrame(df.pop('Pollutants').values.tolist())) is the fastest

Detecting the character encoding of an HTTP POST request

The Charset used in the POST will match that of the Charset specified in the HTML hosting the form. Hence if your form is sent using UTF-8 encoding that is the encoding used for the posted content. The URL encoding is applied after the values are converted to the set of octets for the character encoding.

String.Format for Hex

The number 0 in {0:X} refers to the position in the list or arguments. In this case 0 means use the first value, which is Blue. Use {1:X} for the second argument (Green), and so on.

colorstring = String.Format("#{0:X}{1:X}{2:X}{3:X}", Blue, Green, Red, Space);

The syntax for the format parameter is described in the documentation:

Format Item Syntax

Each format item takes the following form and consists of the following components:
{ index[,alignment][:formatString]}
The matching braces ("{" and "}") are required.

Index Component

The mandatory index component, also called a parameter specifier, is a number starting from 0 that identifies a corresponding item in the list of objects. That is, the format item whose parameter specifier is 0 formats the first object in the list, the format item whose parameter specifier is 1 formats the second object in the list, and so on.

Multiple format items can refer to the same element in the list of objects by specifying the same parameter specifier. For example, you can format the same numeric value in hexadecimal, scientific, and number format by specifying a composite format string like this: "{0:X} {0:E} {0:N}".

Each format item can refer to any object in the list. For example, if there are three objects, you can format the second, first, and third object by specifying a composite format string like this: "{1} {0} {2}". An object that is not referenced by a format item is ignored. A runtime exception results if a parameter specifier designates an item outside the bounds of the list of objects.

Alignment Component

The optional alignment component is a signed integer indicating the preferred formatted field width. If the value of alignment is less than the length of the formatted string, alignment is ignored and the length of the formatted string is used as the field width. The formatted data in the field is right-aligned if alignment is positive and left-aligned if alignment is negative. If padding is necessary, white space is used. The comma is required if alignment is specified.

Format String Component

The optional formatString component is a format string that is appropriate for the type of object being formatted. Specify a standard or custom numeric format string if the corresponding object is a numeric value, a standard or custom date and time format string if the corresponding object is a DateTime object, or an enumeration format string if the corresponding object is an enumeration value. If formatString is not specified, the general ("G") format specifier for a numeric, date and time, or enumeration type is used. The colon is required if formatString is specified.

Note that in your case you only have the index and the format string. You have not specified (and do not need) an alignment component.

get DATEDIFF excluding weekends using sql server

BEGIN 
DECLARE @totaldays INT; 
DECLARE @weekenddays INT;

SET @totaldays = DATEDIFF(DAY, @startDate, @endDate) 
SET @weekenddays = ((DATEDIFF(WEEK, @startDate, @endDate) * 2) + -- get the number of weekend days in between
                       CASE WHEN DATEPART(WEEKDAY, @startDate) = 1 THEN 1 ELSE 0 END + -- if selection was Sunday, won't add to weekends
                       CASE WHEN DATEPART(WEEKDAY, @endDate) = 6 THEN 1 ELSE 0 END)  -- if selection was Saturday, won't add to weekends

Return (@totaldays - @weekenddays)

END

This is on SQL Server 2014

Hidden features of Windows batch files

Here how to build a CLASSPATH by scanning a given directory.

setlocal ENABLEDELAYEDEXPANSION
if defined CLASSPATH (set CLASSPATH=%CLASSPATH%;.) else (set CLASSPATH=.)
FOR /R .\lib %%G IN (*.jar) DO set CLASSPATH=!CLASSPATH!;%%G
Echo The Classpath definition is %CLASSPATH%

works in XP (or better). With W2K, you need to use a couple of BAT files to achieve the same result (see Include all jars in the classpath definition ).

It's not needed for 1.6 since you can specify a wildcard directly in CLASSPATH (ex. -cp ".\lib*").

Send attachments with PHP Mail()?

I ended up writing my own email sending/encoding function. This has worked well for me for sending PDF attachments. I have not used the other features in production.

Note: Despite the spec being quite emphatic that you must use \r\n to separate headers, I found it only worked when I used PHP_EOL. I have only tested this on Linux. YMMV

<?php
# $args must be an associative array
#     required keys: from, to, body
#          body can be a string or a [tree of] associative arrays. See examples below
#     optional keys: subject, reply_to, cc, bcc
# EXAMPLES:
#    # text-only email:
#    email2(array(
#        'from' => '[email protected]',
#        'to' => '[email protected]',
#        'subject' => 'test',
#        # body will be text/plain because we're passing a string that doesn't start with '<'
#        'body' => 'Hi, testing 1 2 3',
#    ));
#
#    # html-only email
#    email2(array(
#        'from' => '[email protected]',
#        'to' => '[email protected]',
#        'subject' => 'test',
#        # body will be text/html because we're passing a string that starts with '<'
#        'body' => '<h1>Hi!</h1>I like <a href="http://cheese.com">cheese</a>',
#    ));
#
#    # text-only email (explicitly, in case first character is dynamic or something)
#    email2(array(
#        'from' => '[email protected]',
#        'to' => '[email protected]',
#        'subject' => 'test',
#        # body will be text/plain because we're passing a string that doesn't start with '<'
#        'body' => array(
#            'type' => 'text',
#            'body' => $message_text,
#        )
#    ));
#
#    # email with text and html alternatives (auto-detected mime types)
#    email2(array(
#        'from' => '[email protected]',
#        'to' => '[email protected]',
#        'subject' => 'test',
#        'body' => array(
#            'type' => 'alternatives',
#            'body' => array(
#                "Hi!\n\nI like cheese",
#                '<h1>Hi!</h1><p>I like <a href="http://cheese.com">cheese</a></p>',
#            )
#        )
#    ));
#
#    # email with text and html alternatives (explicit types)
#    email2(array(
#        'from' => '[email protected]',
#        'to' => '[email protected]',
#        'subject' => 'test',
#        'body' => array(
#            'type' => 'alternatives',
#            'body' => array(
#                array(
#                    'type' => 'text',
#                    'body' => "Hi!\n\nI like cheese",
#                ),
#                array(
#                    'type' => 'html',
#                    'body' => '<h1>Hi!</h1><p>I like cheese</p>',
#                ),
#            )
#        )
#    ));
#
#    # email with an attachment
#    email2(array(
#        'from' => '[email protected]',
#        'to' => '[email protected]',
#        'subject' => 'test',
#        'body' => array(
#            'type' => 'mixed',
#            'body' => array(
#                "Hi!\n\nCheck out this (inline) image",
#                array(
#                    'type' => 'image/png',
#                    'disposition' => 'inline',
#                    'body' => $image_data, # raw file contents
#                ),
#                "Hi!\n\nAnd here's an attachment",
#                array(
#                    'type' => 'application/pdf; name="attachment.pdf"',
#                    'disposition' => 'attachment; filename="attachment.pdf"',
#                    'body' => $pdf_data, # raw file contents
#                ),
#                "Or you can use shorthand:",
#                array(
#                    'type' => 'application/pdf',
#                    'attachment' => 'attachment.pdf', # name for client (not data source)
#                    'body' => $pdf_data, # raw file contents
#                ),
#            )
#        )
#    ))
function email2($args) {
    if (!isset($args['from'])) { return 1; }
    $from = $args['from'];
    if (!isset($args['to'])) { return 2; }
    $to = $args['to'];
    $subject = isset($args['subject']) ? $args['subject'] : '';
    $reply_to = isset($args['reply_to']) ? $args['reply_to'] : '';
    $cc = isset($args['cc']) ? $args['cc'] : '';
    $bcc = isset($args['bcc']) ? $args['bcc'] : '';

    #FIXME should allow many more characters here (and do Q encoding)
    $subject = isset($args['subject']) ? $args['subject'] : '';
    $subject = preg_replace("|[^a-z0-9 _/#'.:&,-]|i", '_', $subject);

    $headers = "From: $from";
    if($reply_to) {
        $headers .= PHP_EOL . "Reply-To: $reply_to";
    }
    if($cc) {
        $headers .= PHP_EOL . "CC: $cc";
    }
    if($bcc) {
        $headers .= PHP_EOL . "BCC: $bcc";
    }

    $r = email2_helper($args['body']);
    $headers .= PHP_EOL . $r[0];
    $body = $r[1];

    if (mail($to, $subject, $body, $headers)) {
        return 0;
    } else {
        return 5;
    }
}

function email2_helper($body, $top = true) {
    if (is_string($body)) {
        if (substr($body, 0, 1) == '<') {
            return email2_helper(array('type' => 'html', 'body' => $body), $top);
        } else {
            return email2_helper(array('type' => 'text', 'body' => $body), $top);
        }
    }
    # now we can assume $body is an associative array
    # defaults:
    $type = 'application/octet-stream';
    $mime = false;
    $boundary = null;
    $disposition = null;
    $charset = false;
    # process 'type' first, because it sets defaults for others
    if (isset($body['type'])) {
        $type = $body['type'];
        if ($type === 'text') {
            $type = 'text/plain';
            $charset = true;
        } elseif ($type === 'html') {
            $type = 'text/html';
            $charset = true;
        } elseif ($type === 'alternative' || $type === 'alternatives') {
            $mime = true;
            $type = 'multipart/alternative';
        } elseif ($type === 'mixed') {
            $mime = true;
            $type = 'multipart/mixed';
        }
    }
    if (isset($body['disposition'])) {
        $disposition = $body['disposition'];
    }
    if (isset($body['attachment'])) {
        if ($disposition == null) {
            $disposition = 'attachment';
        }
        $disposition .= "; filename=\"{$body['attachment']}\"";
        $type .= "; name=\"{$body['attachment']}\"";
    }
    # make headers
    $headers = array();
    if ($top && $mime) {
        $headers[] = 'MIME-Version: 1.0';
    }
    if ($mime) {
        $boundary = md5('5sd^%Ca)~aAfF0=4mIN' . rand() . rand());
        $type .= "; boundary=$boundary";
    }
    if ($charset) {
        $type .= '; charset=' . (isset($body['charset']) ? $body['charset'] : 'UTF-8');
    }
    $headers[] = "Content-Type: $type";
    if ($disposition !== null) {
        $headers[] = "Content-Disposition: {$disposition}";
    }

    $data = '';
    # return array, first el is headers, 2nd is body (php's mail() needs them separate)
    if ($mime) {
        foreach ($body['body'] as $sub_body) {
            $data .= "--$boundary" . PHP_EOL;
            $r = email2_helper($sub_body, false);
            $data .= $r[0] . PHP_EOL . PHP_EOL; # headers
            $data .= $r[1] . PHP_EOL . PHP_EOL; # body
        }
        $data .= "--$boundary--";
    } else {
        if(preg_match('/[^\x09\x0A\x0D\x20-\x7E]/', $body['body'])) {
            $headers[] = "Content-Transfer-Encoding: base64";
            $data .= chunk_split(base64_encode($body['body']));
        } else {
            $data .= $body['body'];
        }
    }
    return array(join(PHP_EOL, $headers), $data);
}

Finding CN of users in Active Directory

CN refers to class name, so put in your LDAP query CN=Users. Should work.

How can I remove a commit on GitHub?

Add/remove files to get things the way you want:

git rm classdir
git add sourcedir

Then amend the commit:

git commit --amend

The previous, erroneous commit will be edited to reflect the new index state - in other words, it'll be like you never made the mistake in the first place

Note that you should only do this if you haven't pushed yet. If you have pushed, then you'll just have to commit a fix normally.

Increase heap size in Java

It is possible to increase heap size allocated by the JVM in eclipse directly In eclipse IDE goto

Run---->Run Configurations---->Arguments

Enter -Xmx1g(It is used to set the max size like Xmx256m or Xmx1g...... m-->mb g--->gb)

Check if key exists in JSON object using jQuery

if you have an array

var subcategories=[{name:"test",desc:"test"}];

function hasCategory(nameStr) {
        for(let i=0;i<subcategories.length;i++){
            if(subcategories[i].name===nameStr){
                return true;
            }
        }
        return false;
    }

if you have an object

var category={name:"asd",test:""};

if(category.hasOwnProperty('name')){//or category.name!==undefined
   return true;
}else{
   return false;
}

Responsive iframe using Bootstrap

Please, Check this out, I hope it's help

<div class="row">
 <iframe class="col-lg-12 col-md-12 col-sm-12" src="http://www.w3schools.com">
 </iframe>
</div>

Android Horizontal RecyclerView scroll Direction

In Recycler Layout manager the second parameter is spanCount increase or decrease in span count will change number of elements show on your screen

    RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(this, 2, //The number of Columns in the grid
,GridLayoutManager.HORIZONTAL,false);
                recyclerView.setLayoutManager(mLayoutManager);

JPA Hibernate Persistence exception [PersistenceUnit: default] Unable to build Hibernate SessionFactory

The issue is that you are not able to get a connection to MYSQL database and hence it is throwing an error saying that cannot build a session factory.

Please see the error below:

 Caused by: java.sql.SQLException: Access denied for user ''@'localhost' (using password: NO)

which points to username not getting populated.

Please recheck system properties

dataSource.setUsername(System.getProperty("root"));

some packages seems to be missing as well pointing to a dependency issue:

package org.gjt.mm.mysql does not exist

Please run a mvn dependency:tree command to check for dependencies

Class 'ViewController' has no initializers in swift

For me was a declaration incomplete. For example:

var isInverted: Bool

Instead the correct way:

var isInverted: Bool = false

Convert String to System.IO.Stream

string str = "asasdkopaksdpoadks";
byte[] data = Encoding.ASCII.GetBytes(str);
MemoryStream stm = new MemoryStream(data, 0, data.Length);

Scale the contents of a div by a percentage?

You can simply use the zoom property:

#myContainer{
    zoom: 0.5;
    -moz-transform: scale(0.5);
}

Where myContainer contains all the elements you're editing. This is supported in all major browsers.

No newline after div?

<div style="display: inline">Is this what you meant?</div>

Customizing the template within a Directive

Tried to use the solution proposed by Misko, but in my situation, some attributes, which needed to be merged into my template html, were themselves directives.

Unfortunately, not all of the directives referenced by the resulting template did work correctly. I did not have enough time to dive into angular code and find out the root cause, but found a workaround, which could potentially be helpful.

The solution was to move the code, which creates the template html, from compile to a template function. Example based on code from above:

    angular.module('formComponents', [])
  .directive('formInput', function() {
    return {
        restrict: 'E',
        template: function(element, attrs) {
           var type = attrs.type || 'text';
            var required = attrs.hasOwnProperty('required') ? "required='required'" : "";
            var htmlText = '<div class="control-group">' +
                '<label class="control-label" for="' + attrs.formId + '">' + attrs.label + '</label>' +
                    '<div class="controls">' +
                    '<input type="' + type + '" class="input-xlarge" id="' + attrs.formId + '" name="' + attrs.formId + '" ' + required + '>' +
                    '</div>' +
                '</div>';
             return htmlText;
        }
        compile: function(element, attrs)
        {
           //do whatever else is necessary
        }
    }
})

How to sort a data frame by alphabetic order of a character variable in R?

#sort dataframe by col
sort.df <- with(df,  df[order(sortbythiscolumn) , ])

#can also sort by more than one variable: sort by col1 and then by col2
sort2.df <- with(df, df[order(col1, col2) , ])

#sort in reverse order
sort2.df <- with(df, df[order(col1, -col2) , ])

iframe to Only Show a Certain Part of the Page

I got this work good for me.

<div style="border: 3px solid rgb(201, 0, 1); overflow: hidden; margin: 15px auto; max-width: 736px;">
<iframe scrolling="no" src="http://www.w3schools.com/css/default.asp" style="border: 0px none; margin-left: -185px; height: 859px; margin-top: -533px; width: 926px;">
</iframe>
</div>

Is this working for you or not let us know.

Source: http://www.dimpost.com/2012/12/iframe-how-to-display-specific-part-of.html

How do I completely rename an Xcode project (i.e. inclusive of folders)?

A quicker solution using shell commands (works with CocoaPods too):

PLEASE cd TO A NON-GIT REPOSITORY BEFORE PROCEEDING ??

Step 1 - Prerequisites

Copy your original project folder to a temporary /NewProjectFolder OUTSIDE your git repository. ?? changes to .git could corrupt your git index ?

Step 2 - Open Terminal

Now we're going to rename the project from oldName to NewProject.

Close XCode.
Go to your /NewProjectFolder.

cd /Path/to/your/NewProjectFolder

Install the extra tools needed.

brew install rename ack

Rename the files and directories containing the source string. You’ll need to RUN THIS COMMAND TWICE, because directories will be renamed first, then files and directories inside those will be renamed on the next iteration.

find . -name 'oldName*' -print0 | xargs -0 rename --subst-all 'oldName' 'NewProject'

Check if all the files containing the source string are renamed. You should see empty output.

find . -name 'oldName*'

Replace all occurrences of the string in all files.

ack --literal --files-with-matches 'oldName' --print0 | xargs -0 sed -i '' 's/oldName/NewProject/g'

Check if all occurrences of the string in all files were replaced. You should see empty output.

ack --literal 'oldName'

Run pod install
Add NewProjectFolder to your repository.
You are done!

VBA code to show Message Box popup if the formula in the target cell exceeds a certain value

You could add the following VBA code to your sheet:

Private Sub Worksheet_Change(ByVal Target As Range)
    If Range("A1") > 0.5 Then
        MsgBox "Discount too high"
    End If
End Sub

Every time a cell is changed on the sheet, it will check the value of cell A1.

Notes:

if A1 also depends on data located in other spreadsheets, the macro will not be called if you change that data.
the macro will be called will be called every time something changes on your sheet. If it has lots of formula (as in 1000s) it could be slow.

Widor uses a different approach (Worksheet_Calculate instead of Worksheet_Change):

Pros: his method will work if A1's value is linked to cells located in other sheets.
Cons: if you have many links on your sheet that reference other sheets, his method will run a bit slower.

Conclusion: use Worksheet_Change if A1 only depends on data located on the same sheet, use Worksheet_Calculate if not.

Unable to install Maven on Windows: "JAVA_HOME is set to an invalid directory"

ERROR: JAVA_HOME is set to an invalid directory. JAVA_HOME = "E:\Sun\SDK\jdk\bin" Please set the JAVA_HOME variable in your environment to match the location of your Java installation

JAVA_HOME should be set to E:\Sun\SDK\jdk. PATH should be set to include %JAVA_HOME%\bin.

How to extract text from an existing docx file using python-docx

you can try this also

from docx import Document

document = Document('demo.docx')
for para in document.paragraphs:
    print(para.text)

How to sort a dataframe by multiple column(s)

Your choices

order from base
arrange from dplyr
setorder and setorderv from data.table
arrange from plyr
sort from taRifx
orderBy from doBy
sortData from Deducer

Most of the time you should use the dplyr or data.table solutions, unless having no-dependencies is important, in which case use base::order.

I recently added sort.data.frame to a CRAN package, making it class compatible as discussed here: Best way to create generic/method consistency for sort.data.frame?

Therefore, given the data.frame dd, you can sort as follows:

dd <- data.frame(b = factor(c("Hi", "Med", "Hi", "Low"), 
      levels = c("Low", "Med", "Hi"), ordered = TRUE),
      x = c("A", "D", "A", "C"), y = c(8, 3, 9, 9),
      z = c(1, 1, 1, 2))
library(taRifx)
sort(dd, f= ~ -z + b )

If you are one of the original authors of this function, please contact me. Discussion as to public domaininess is here: https://chat.stackoverflow.com/transcript/message/1094290#1094290

You can also use the arrange() function from plyr as Hadley pointed out in the above thread:

library(plyr)
arrange(dd,desc(z),b)

Benchmarks: Note that I loaded each package in a new R session since there were a lot of conflicts. In particular loading the doBy package causes sort to return "The following object(s) are masked from 'x (position 17)': b, x, y, z", and loading the Deducer package overwrites sort.data.frame from Kevin Wright or the taRifx package.

#Load each time
dd <- data.frame(b = factor(c("Hi", "Med", "Hi", "Low"), 
      levels = c("Low", "Med", "Hi"), ordered = TRUE),
      x = c("A", "D", "A", "C"), y = c(8, 3, 9, 9),
      z = c(1, 1, 1, 2))
library(microbenchmark)

# Reload R between benchmarks
microbenchmark(dd[with(dd, order(-z, b)), ] ,
    dd[order(-dd$z, dd$b),],
    times=1000
)

Median times:

dd[with(dd, order(-z, b)), ] 778

dd[order(-dd$z, dd$b),] 788

library(taRifx)
microbenchmark(sort(dd, f= ~-z+b ),times=1000)

Median time: 1,567

library(plyr)
microbenchmark(arrange(dd,desc(z),b),times=1000)

Median time: 862

library(doBy)
microbenchmark(orderBy(~-z+b, data=dd),times=1000)

Median time: 1,694

Note that doBy takes a good bit of time to load the package.

library(Deducer)
microbenchmark(sortData(dd,c("z","b"),increasing= c(FALSE,TRUE)),times=1000)

Couldn't make Deducer load. Needs JGR console.

esort <- function(x, sortvar, ...) {
attach(x)
x <- x[with(x,order(sortvar,...)),]
return(x)
detach(x)
}

microbenchmark(esort(dd, -z, b),times=1000)

Doesn't appear to be compatible with microbenchmark due to the attach/detach.

m <- microbenchmark(
  arrange(dd,desc(z),b),
  sort(dd, f= ~-z+b ),
  dd[with(dd, order(-z, b)), ] ,
  dd[order(-dd$z, dd$b),],
  times=1000
  )

uq <- function(x) { fivenum(x)[4]}  
lq <- function(x) { fivenum(x)[2]}

y_min <- 0 # min(by(m$time,m$expr,lq))
y_max <- max(by(m$time,m$expr,uq)) * 1.05
  
p <- ggplot(m,aes(x=expr,y=time)) + coord_cartesian(ylim = c( y_min , y_max )) 
p + stat_summary(fun.y=median,fun.ymin = lq, fun.ymax = uq, aes(fill=expr))

(lines extend from lower quartile to upper quartile, dot is the median)

Given these results and weighing simplicity vs. speed, I'd have to give the nod to arrange in the plyr package. It has a simple syntax and yet is almost as speedy as the base R commands with their convoluted machinations. Typically brilliant Hadley Wickham work. My only gripe with it is that it breaks the standard R nomenclature where sorting objects get called by sort(object), but I understand why Hadley did it that way due to issues discussed in the question linked above.

Disable submit button when form invalid with AngularJS

Selected response is correct, but someone like me, may have issues with async validation with sending request to the server-side - button will be not disabled during given request processing, so button will blink, which looks pretty strange for the users.

To void this, you just need to handle $pending state of the form:

<form name="myForm">
  <input name="myText" type="text" ng-model="mytext" required />
  <button ng-disabled="myForm.$invalid || myForm.$pending">Save</button>
</form>

Setting the default value of a DateTime Property to DateTime.Now inside the System.ComponentModel Default Value Attrbute

I think you can do this using StoreGeneratedPattern = Identity (set in the model designer properties window).

I wouldn't have guessed that would be how to do it, but while trying to figure it out I noticed that some of my date columns were already defaulting to CURRENT_TIMESTAMP() and some weren't. Checking the model, I see that the only difference between the two columns besides the name is that the one getting the default value has StoreGeneratedPattern set to Identity.

I wouldn't have expected that to be the way, but reading the description, it sort of makes sense:

Determines if the corresponding column in the database will be auto-generated during insert and update operations.

Also, while this does make the database column have a default value of "now", I guess it does not actually set the property to be DateTime.Now in the POCO. This hasn't been an issue for me as I have a customized .tt file that already sets all of my date columns to DateTime.Now automatically (it's actually not hard to modify the .tt file yourself, especially if you have ReSharper and get a syntax highlighting plugin. (Newer versions of VS may already syntax highlight .tt files, not sure.))

The issue for me was: how do I get the database column to have a default so that existing queries that omit that column will still work? And the above setting worked for that.

I haven't tested it yet but it's also possible that setting this will interfere with setting your own explicit value. (I only stumbled upon this in the first place because EF6 Database First wrote the model for me this way.)

Jetty: HTTP ERROR: 503/ Service Unavailable

I had the same problem. I solved it by removing the line break from the xml file. I did

<operationBindings>
    <OperationBinding>
        <operationType>update</operationType>
        <operationId>makePdf</operationId>
        <serverObject>
            <className>com.myclass</className>
            <lookupStyle>new</lookupStyle>
        </serverObject>
        <serverMethod>makePdf</serverMethod>
    </OperationBinding>
</operationBindings>

instead of ...

<serverObject>
            <className>com.myclass
</className>
            <lookupStyle>new</lookupStyle>
</serverObject>

Getting net::ERR_UNKNOWN_URL_SCHEME while calling telephone number from HTML page in Android

Try this way,hope this will help you to solve your problem.

main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center">

    <WebView
        android:id="@+id/webView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</LinearLayout>

MyActivity.java

public class MyActivity extends Activity {

    private WebView webView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        webView = (WebView) findViewById(R.id.webView);
        webView.loadData("<a href=\"tel:+1800229933\">Call us free!</a>", "text/html", "utf-8");
    }

}

Please add this permission in AndroidManifest.xml

<uses-permission android:name="android.permission.CALL_PHONE"/>

How do I combine two lists into a dictionary in Python?

I found myself needing to create a dictionary of three lists (latitude, longitude, and a value), with the following doing the trick:

> lat = [45.3,56.2,23.4,60.4]
> lon = [134.6,128.7,111.9,75.8]
> val = [3,6,2,5]
> dict(zip(zip(lat,lon),val))
{(56.2, 128.7): 6, (60.4, 75.8): 5, (23.4, 111.9): 2, (45.3, 134.6): 3}

or similar to the above examples:

> list1 = [1,2,3,4]
> list2 = [1,2,3,4]
> list3 = ['a','b','c','d']
> dict(zip(zip(list1,list2),list3))
{(3, 3): 'c', (4, 4): 'd', (1, 1): 'a', (2, 2): 'b'}

Note: Dictionaries are "orderless", but if you would like to view it as "sorted", refer to THIS question if you'd like to sort by key, or THIS question if you'd like to sort by value.

What is ROWS UNBOUNDED PRECEDING used for in Teradata?

ROWS UNBOUNDED PRECEDING is no Teradata-specific syntax, it's Standard SQL. Together with the ORDER BY it defines the window on which the result is calculated.

Logically a Windowed Aggregate Function is newly calculated for each row within the PARTITION based on all ROWS between a starting row and an ending row.

Starting and ending rows might be fixed or relative to the current row based on the following keywords:

CURRENT ROW, the current row
UNBOUNDED PRECEDING, all rows before the current row -> fixed
UNBOUNDED FOLLOWING, all rows after the current row -> fixed
x PRECEDING, x rows before the current row -> relative
y FOLLOWING, y rows after the current row -> relative

Possible kinds of calculation include:

Both starting and ending row are fixed, the window consists of all rows of a partition, e.g. a Group Sum, i.e. aggregate plus detail rows
One end is fixed, the other relative to current row, the number of rows increases or decreases, e.g. a Running Total, Remaining Sum
Starting and ending row are relative to current row, the number of rows within a window is fixed, e.g. a Moving Average over n rows

So SUM(x) OVER (ORDER BY col ROWS UNBOUNDED PRECEDING) results in a Cumulative Sum or Running Total

11 -> 11
 2 -> 11 +  2                = 13
 3 -> 13 +  3 (or 11+2+3)    = 16
44 -> 16 + 44 (or 11+2+3+44) = 60

Binary Data Posting with curl

You don't need --header "Content-Length: $LENGTH".

curl --request POST --data-binary "@template_entry.xml" $URL

Note that GET request does not support content body widely.

Also remember that POST request have 2 different coding schema. This is first form:

  $ nc -l -p 6666 &
  $ curl  --request POST --data-binary "@README" http://localhost:6666

POST / HTTP/1.1
User-Agent: curl/7.21.0 (x86_64-pc-linux-gnu) libcurl/7.21.0 OpenSSL/0.9.8o zlib/1.2.3.4 libidn/1.15 libssh2/1.2.6
Host: localhost:6666
Accept: */*
Content-Length: 9309
Content-Type: application/x-www-form-urlencoded
Expect: 100-continue

.. -*- mode: rst; coding: cp1251; fill-column: 80 -*-
.. rst2html.py README README.html
.. contents::

You probably request this:

-F/--form name=content
           (HTTP) This lets curl emulate a filled-in form in
              which a user has pressed the submit button. This
              causes curl to POST data using the Content- Type
              multipart/form-data according to RFC2388. This
              enables uploading of binary files etc. To force the
              'content' part to be a file, prefix the file name
              with an @ sign. To just get the content part from a
              file, prefix the file name with the symbol <. The
              difference between @ and < is then that @ makes a
              file get attached in the post as a file upload,
              while the < makes a text field and just get the
              contents for that text field from a file.

How to get the latest file in a folder?

A much faster method on windows (0.05s), call a bat script that does this:

get_latest.bat

@echo off
for /f %%i in ('dir \\directory\in\question /b/a-d/od/t:c') do set LAST=%%i
%LAST%

where \\directory\in\question is the directory you want to investigate.

get_latest.py

from subprocess import Popen, PIPE
p = Popen("get_latest.bat", shell=True, stdout=PIPE,)
stdout, stderr = p.communicate()
print(stdout, stderr)

if it finds a file stdout is the path and stderr is None.

Use stdout.decode("utf-8").rstrip() to get the usable string representation of the file name.

Optimal way to DELETE specified rows from Oracle

Store all the to be deleted ID's into a table. Then there are 3 ways. 1) loop through all the ID's in the table, then delete one row at a time for X commit interval. X can be a 100 or 1000. It works on OLTP environment and you can control the locks.

2) Use Oracle Bulk Delete

3) Use correlated delete query.

Single query is usually faster than multiple queries because of less context switching, and possibly less parsing.

How to simulate key presses or a click with JavaScript?

Focus might be what your looking for. With tabbing or clicking I think u mean giving the element the focus. Same code as Russ (Sorry i stole it :P) but firing an other event.

// this must be done after input1 exists in the DOM
var element = document.getElementById("input1");

if (element) element.focus();

How do I capitalize first letter of first name and last name in C#?

CultureInfo.CurrentCulture.TextInfo.ToTitleCase ("my name");

returns ~ My Name

But the problem still exists with names like McFly as stated earlier.

How to locate the git config file in Mac

You don't need to find the file.

Only write this instruction on terminal:

git config --global --edit

Visual Studio: ContextSwitchDeadlock

As Pedro said, you have an issue with the debugger preventing the message pump if you are stepping through code.

But if you are performing a long running operation on the UI thread, then call Application.DoEvents() which explicitly pumps the message queue and then returns control to your current method.

However if you are doing this I would recommend at looking at your design so that you can perform processing off the UI thread so that your UI remains nice and snappy.

how to change listen port from default 7001 to something different?

The following lines are used to control the listen-port of a server, both are necessary:

    <listen-port>7002</listen-port>
    <listen-port-enabled>true</listen-port-enabled>

What is the difference between HTTP and REST?

Not quite...

http://en.wikipedia.org/wiki/Representational_State_Transfer

REST was initially described in the context of HTTP, but is not limited to that protocol. RESTful architectures can be based on other Application Layer protocols if they already provide a rich and uniform vocabulary for applications based on the transfer of meaningful representational state. RESTful applications maximise the use of the pre-existing, well-defined interface and other built-in capabilities provided by the chosen network protocol, and minimise the addition of new application-specific features on top of it.

http://www.looselycoupled.com/glossary/SOAP

(Simple Object Access Protocol) The standard for web services messages. Based on XML, SOAP defines an envelope format and various rules for describing its contents. Seen (with WSDL and UDDI) as one of the three foundation standards of web services, it is the preferred protocol for exchanging web services, but by no means the only one; proponents of REST say that it adds unnecessary complexity.

Excel cell value as string won't store as string

Use Range("A1").Text instead of .Value

post comment edit:
Why?
Because the .Text property of Range object returns what is literally visible in the spreadsheet, so if you cell displays for example i100l:25he*_92 then <- Text will return exactly what it in the cell including any formatting.
The .Value and .Value2 properties return what's stored in the cell under the hood excluding formatting. Specially .Value2 for date types, it will return the decimal representation.

If you want to dig deeper into the meaning and performance, I just found this article which seems like a good guide

another edit
Here you go @Santosh
type in (MANUALLY) the values from the DEFAULT (col A) to other columns
Do not format column A at all
Format column B as Text
Format column C as Date[dd/mm/yyyy]
Format column D as Percentage
Dont Format column A, Format B as TEXT, C as Date, D as Percentage
now,
paste this code in a module

Sub main()

    Dim ws As Worksheet, i&, j&
    Set ws = Sheets(1)
    For i = 3 To 7
        For j = 1 To 4
            Debug.Print _
                    "row " & i & vbTab & vbTab & _
                    Cells(i, j).Text & vbTab & _
                    Cells(i, j).Value & vbTab & _
                    Cells(i, j).Value2
        Next j
    Next i
End Sub

and Analyse the output! Its really easy and there isn't much more i can do to help :)

            .TEXT              .VALUE             .VALUE2
row 3       hello             hello               hello
row 3       hello             hello               hello
row 3       hello             hello               hello
row 3       hello             hello               hello
row 4       1                 1                   1
row 4       1                 1                   1
row 4       01/01/1900        31/12/1899          1
row 4       1.00%             0.01                0.01
row 5       helo1$$           helo1$$             helo1$$
row 5       helo1$$           helo1$$             helo1$$
row 5       helo1$$           helo1$$             helo1$$
row 5       helo1$$           helo1$$             helo1$$
row 6       63                63                  63
row 6       =7*9              =7*9                =7*9
row 6       03/03/1900        03/03/1900          63
row 6       6300.00%          63                  63
row 7       29/05/2013        29/05/2013          41423
row 7       29/05/2013        29/05/2013          29/05/2013
row 7       29/05/2013        29/05/2013          41423
row 7       29/05/2013%       29/05/2013%         29/05/2013%

Android studio doesn't list my phone under "Choose Device"

Go to this website that has free software to download drivers for android phones: http://www.skipsoft.net/?wpdmpro=unified-android-toolkit-v1-4-0
Click on Download Unified Android Toolkit
Install drivers for you android device

How do I find out what is hammering my SQL Server?

Run either of these a few second apart. You'll detect the high CPU connection. Or: stored CPU in a local variable, WAITFOR DELAY, compare stored and current CPU values

select * from master..sysprocesses
where status = 'runnable' --comment this out
order by CPU
desc

select * from master..sysprocesses
order by CPU
desc

May not be the most elegant but it'd effective and quick.

formGroup expects a FormGroup instance

I had a the same error and solved it after moving initialization of formBuilder from ngOnInit to constructor.

versionCode vs versionName in Android Manifest

android:versionCode — An integer value that represents the version of the application code, relative to other versions.

The value is an integer so that other applications can programmatically evaluate it, for example to check an upgrade or downgrade relationship. You can set the value to any integer you want, however you should make sure that each successive release of your application uses a greater value. The system does not enforce this behavior, but increasing the value with successive releases is normative.

android:versionName — A string value that represents the release version of the application code, as it should be shown to users.

The value is a string so that you can describe the application version as a .. string, or as any other type of absolute or relative version identifier.

As with android:versionCode, the system does not use this value for any internal purpose, other than to enable applications to display it to users. Publishing services may also extract the android:versionName value for display to users.

Typically, you would release the first version of your application with versionCode set to 1, then monotonically increase the value with each release, regardless whether the release constitutes a major or minor release. This means that the android:versionCode value does not necessarily have a strong resemblance to the application release version that is visible to the user (see android:versionName, below). Applications and publishing services should not display this version value to users.

adding a datatable in a dataset

Just give any name to the DataTable Like:

DataTable dt = new DataTable();
dt = SecondDataTable.Copy();    
dt .TableName = "New Name";
DataSet.Tables.Add(dt );

How do I validate a date in rails?

Have you tried the validates_date_time plug-in?

Apache SSL Configuration Error (SSL Connection Error)

I was getting the same error in chrome (and different one in Firefox, IE). Also in error.log i was getting [error] [client cli.ent.ip.add] Invalid method in request \x16\x03 Following the instructions form this site I changed my configuration FROM:

<VirtualHost subdomain.domain.com:443>

   ServerAdmin [email protected]
   ServerName subdomain.domain.com

   SSLEngine On
   SSLCertificateFile conf/ssl/ssl.crt
   SSLCertificateKeyFile conf/ssl/ssl.key
</VirtualHost>

TO:

<VirtualHost _default_:443>

   ServerAdmin [email protected]
   ServerName subdomain.domain.com

   SSLEngine On
   SSLCertificateFile conf/ssl/ssl.crt
   SSLCertificateKeyFile conf/ssl/ssl.key
</VirtualHost>

Now it's working fine :)

How to convert char to integer in C?

In the old days, when we could assume that most computers used ASCII, we would just do

int i = c[0] - '0';

~~But in these days of Unicode, it's not a good idea. It was never a good idea if your code had to run on a non-ASCII computer.~~

Edit: Although it looks hackish, evidently it is guaranteed by the standard to work. Thanks @Earwicker.

How do I 'overwrite', rather than 'merge', a branch on another branch in Git?

WARNING: This deletes all commits on the email branch. It's like deleting the email branch and creating it anew at the head of the staging branch.

The easiest way to do it:

//the branch you want to overwrite
git checkout email 

//reset to the new branch
git reset --hard origin/staging

// push to remote
git push -f

Now the email branch and the staging are the same.

How do I access refs of a child component in the parent component

First of all, I want to say a big screw you to React for designing an interface that doesn't let us access 'ref' on the instantiated child components, in whatever context, without having to use the 'forwardRef' "hack" (which technically only works on specific/single instances, and not dynamic collections). Thanks for making our lives harder with your proprietary hook crap and now forcing us to use functional components (which can't inherit base functionality without more hacks). Why did JavaScript add class support to begin with? Right...

With that said, here is how I solve the problem for dynamic components:

On the parent, dynamically create references to the child components, for example:

class Form extends Component {
    fieldRefs: [];

    componentWillMount = () => {
        this.fieldRefs = [];
        for(let f of this.props.children) {
            if (f && f.type.name == 'FormField') {
                f.ref = createRef();
                this.fieldRefs.push(f);
            }
        }
    }

    public getFields = () => {
        let data = {};

        for(let r of this.fieldRefs) {
            let f = r.ref.current;
            data[f.props.id] = f.field.current.value;
        }

        return data;
    }
}

The Child component (ie <FormField />) implements it's own 'field' ref, to be referred to from the parent:

class FormField extends Component {
    field = createRef();
    
    render() {
        return(
            <input ref={this.field} type={type} />
        );
    }
}

Then in your main page, "Parent Parent" component, you can get the field values from the reference with:

class Page extends Component {
    form = createRef();

    onSubmit = () => {
        let fields = this.form.current.getFields();
    }

    render() {
        return (
            <Form ref={this.form}>
                <FormField id="email" type="email" autoComplete="email" label="E-mail" />
                <FormField id="password" type="password" autoComplete="password" label="Password" />

                <div class="button" onClick={this.onSubmit}>Submit</div>
            </Form>
        );
    }
}

I implemented this because I wanted to encapsulate all generic form functionality from a main <Form /> component, and the only way to be able to have the main client/page component set and style its own inner components was to use child components (ie. <FormField /> items within the parent <Form />, which is inside some other <Page /> component).

So, while some might consider this a hack, it's just as hackey as React's attempts to block the actual 'ref' from any parent, which I think is a ridiculous design, however they want to rationalize it.

Also wtf SO. It's 2021 and we still don't have get proper code-editing tools in your editor. Ffs.

SQLAlchemy create_all() does not create tables

You should put your model class before create_all() call, like this:

from flask import Flask
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)

app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql+psycopg2://login:pass@localhost/flask_app'
db = SQLAlchemy(app)

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True)
    email = db.Column(db.String(120), unique=True)

    def __init__(self, username, email):
        self.username = username
        self.email = email

    def __repr__(self):
        return '<User %r>' % self.username

db.create_all()
db.session.commit()

admin = User('admin', '[email protected]')
guest = User('guest', '[email protected]')
db.session.add(admin)
db.session.add(guest)
db.session.commit()
users = User.query.all()
print users

If your models are declared in a separate module, import them before calling create_all().

Say, the User model is in a file called models.py,

from flask import Flask
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)

app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql+psycopg2://login:pass@localhost/flask_app'
db = SQLAlchemy(app)

# See important note below
from models import User

db.create_all()
db.session.commit()

admin = User('admin', '[email protected]')
guest = User('guest', '[email protected]')
db.session.add(admin)
db.session.add(guest)
db.session.commit()
users = User.query.all()
print users

Important note: It is important that you import your models after initializing the db object since, in your models.py _you also need to import the db object from this module.

How do I set a ViewModel on a window in XAML using DataContext property?

In addition to the solution that other people provided (which are good, and correct), there is a way to specify the ViewModel in XAML, yet still separate the specific ViewModel from the View. Separating them is useful for when you want to write isolated test cases.

In App.xaml:

<Application
    x:Class="BuildAssistantUI.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:BuildAssistantUI.ViewModels"
    StartupUri="MainWindow.xaml"
    >
    <Application.Resources>
        <local:MainViewModel x:Key="MainViewModel" />
    </Application.Resources>
</Application>

In MainWindow.xaml:

<Window x:Class="BuildAssistantUI.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    DataContext="{StaticResource MainViewModel}"
    />

Extension methods must be defined in a non-generic static class

A work-around for people who are experiencing a bug like Nathan:

The on-the-fly compiler seems to have a problem with this Extension Method error... adding static didn't help me either.

I'd like to know what causes the bug?

But the work-around is to write a new Extension class (not nested) even in same file and re-build.

Figured that this thread is getting enough views that it's worth passing on (the limited) solution I found. Most people probably tried adding 'static' before google-ing for a solution! and I didn't see this work-around fix anywhere else.

How to detect simple geometric shapes using OpenCV

The answer depends on the presence of other shapes, level of noise if any and invariance you want to provide for (e.g. rotation, scaling, etc). These requirements will define not only the algorithm but also required pre-procesing stages to extract features.

Template matching that was suggested above works well when shapes aren't rotated or scaled and when there are no similar shapes around; in other words, it finds a best translation in the image where template is located:

double minVal, maxVal;
Point minLoc, maxLoc;
Mat image, template, result; // template is your shape
matchTemplate(image, template, result, CV_TM_CCOEFF_NORMED);
minMaxLoc(result, &minVal, &maxVal, &minLoc, &maxLoc); // maxLoc is answer

Geometric hashing is a good method to get invariance in terms of rotation and scaling; this method would require extraction of some contour points.

Generalized Hough transform can take care of invariance, noise and would have minimal pre-processing but it is a bit harder to implement than other methods. OpenCV has such transforms for lines and circles.

In the case when number of shapes is limited calculating moments or counting convex hull vertices may be the easiest solution: openCV structural analysis

downloading all the files in a directory with cURL

OK, considering that you are using Windows, the most simple way to do that is to use the standard ftp tool bundled with it. I base the following solution on Windows XP, hoping it'll work as well (or with minor modifications) on other versions.

First of all, you need to create a batch (script) file for the ftp program, containing instructions for it. Name it as you want, and put into it:

curl -u login:pass ftp.myftpsite.com/iiumlabs* -O

open ftp.myftpsite.com
login
pass
mget *
quit

The first line opens a connection to the ftp server at ftp.myftpsite.com. The two following lines specify the login, and the password which ftp will ask for (replace login and pass with just the login and password, without any keywords). Then, you use mget * to get all files. Instead of the *, you can use any wildcard. Finally, you use quit to close the ftp program without interactive prompt.

If you needed to enter some directory first, add a cd command before mget. It should be pretty straightforward.

Finally, write that file and run ftp like this:

ftp -i -s:yourscript

where -i disables interactivity (asking before downloading files), and -s specifies path to the script you created.

Sadly, file transfer over SSH is not natively supported in Windows. But for that case, you'd probably want to use PuTTy tools anyway. The one of particular interest for this case would be pscp which is practically the PuTTy counter-part of the openssh scp command.

The syntax is similar to copy command, and it supports wildcards:

pscp -batch [email protected]:iiumlabs* .

If you authenticate using a key file, you should pass it using -i path-to-key-file. If you use password, -pw pass. It can also reuse sessions saved using PuTTy, using the load -load your-session-name argument.

Text Editor For Linux (Besides Vi)?

Kate, the KDE Advanced Text Editor is quite good. It has syntax highlighting, block selection mode, terminal/console, sessions, window splitting both horizontal and vertical etc.

TABLOCK vs TABLOCKX

This is more of an example where TABLOCK did not work for me and TABLOCKX did.

I have 2 sessions, that both use the default (READ COMMITTED) isolation level:

Session 1 is an explicit transaction that will copy data from a linked server to a set of tables in a database, and takes a few seconds to run. [Example, it deletes Questions] Session 2 is an insert statement, that simply inserts rows into a table that Session 1 doesn't make changes to. [Example, it inserts Answers].

(In practice there are multiple sessions inserting multiple records into the table, simultaneously, while Session 1 is running its transaction).

Session 1 has to query the table Session 2 inserts into because it can't delete records that depend on entries that were added by Session 2. [Example: Delete questions that have not been answered].

So, while Session 1 is executing and Session 2 tries to insert, Session 2 loses in a deadlock every time.

So, a delete statement in Session 1 might look something like this: DELETE tblA FROM tblQ LEFT JOIN tblX on ... LEFT JOIN tblA a ON tblQ.Qid = tblA.Qid WHERE ... a.QId IS NULL and ...

The deadlock seems to be caused from contention between querying tblA while Session 2, [3, 4, 5, ..., n] try to insert into tblA.

In my case I could change the isolation level of Session 1's transaction to be SERIALIZABLE. When I did this: The transaction manager has disabled its support for remote/network transactions.

So, I could follow instructions in the accepted answer here to get around it: The transaction manager has disabled its support for remote/network transactions

But a) I wasn't comfortable with changing the isolation level to SERIALIZABLE in the first place- supposedly it degrades performance and may have other consequences I haven't considered, b) didn't understand why doing this suddenly caused the transaction to have a problem working across linked servers, and c) don't know what possible holes I might be opening up by enabling network access.

There seemed to be just 6 queries within a very large transaction that are causing the trouble.

So, I read about TABLOCK and TabLOCKX.

I wasn't crystal clear on the differences, and didn't know if either would work. But it seemed like it would. First I tried TABLOCK and it didn't seem to make any difference. The competing sessions generated the same deadlocks. Then I tried TABLOCKX, and no more deadlocks.

So, in six places, all I needed to do was add a WITH (TABLOCKX).

So, a delete statement in Session 1 might look something like this: DELETE tblA FROM tblQ q LEFT JOIN tblX x on ... LEFT JOIN tblA a WITH (TABLOCKX) ON tblQ.Qid = tblA.Qid WHERE ... a.QId IS NULL and ...

Most concise way to test string equality (not object equality) for Ruby strings or symbols?

Your code sample didn't expand on part of your topic, namely symbols, and so that part of the question went unanswered.

If you have two strings, foo and bar, and both can be either a string or a symbol, you can test equality with

foo.to_s == bar.to_s

It's a little more efficient to skip the string conversions on operands with known type. So if foo is always a string

foo == bar.to_s

But the efficiency gain is almost certainly not worth demanding any extra work on behalf of the caller.

Prior to Ruby 2.2, avoid interning uncontrolled input strings for the purpose of comparison (with strings or symbols), because symbols are not garbage collected, and so you can open yourself to denial of service through resource exhaustion. Limit your use of symbols to values you control, i.e. literals in your code, and trusted configuration properties.

Ruby 2.2 introduced garbage collection of symbols.

What Vim command(s) can be used to quote/unquote words?

I'm using nnoremap in my .vimrc

To single quote a word:

nnoremap sq :silent! normal mpea'<Esc>bi'<Esc>`pl

To remove quotes (works on double quotes as well):

nnoremap qs :silent! normal mpeld bhd `ph<CR>

Rule to remember: 'sq' = single quote.

JPA : How to convert a native query result set to POJO class collection

JPA provides an SqlResultSetMapping that allows you to map whatever returns from your native query into an Entity ~~or a custom class~~.

EDIT JPA 1.0 does not allow mapping to non-entity classes. Only in JPA 2.1 a ConstructorResult has been added to map return values a java class.

Also, for OP's problem with getting count it should be enough to define a result set mapping with a single ColumnResult

How do I check for a network connection?

Microsoft windows vista and 7 use NCSI (Network Connectivity Status Indicator) technic:

NCSI performs a DNS lookup on www.msftncsi.com, then requests http://www.msftncsi.com/ncsi.txt. This file is a plain-text file and contains only the text 'Microsoft NCSI'.
NCSI sends a DNS lookup request for dns.msftncsi.com. This DNS address should resolve to 131.107.255.255. If the address does not match, then it is assumed that the internet connection is not functioning correctly.

How can I add shadow to the widget in flutter?

class ShadowContainer extends StatelessWidget {
  ShadowContainer({
    Key key,
    this.margin = const EdgeInsets.fromLTRB(0, 10, 0, 8),
    this.padding = const EdgeInsets.symmetric(horizontal: 8),
    this.circular = 4,
    this.shadowColor = const Color.fromARGB(
        128, 158, 158, 158), //Colors.grey.withOpacity(0.5),
    this.backgroundColor = Colors.white,
    this.spreadRadius = 1,
    this.blurRadius = 3,
    this.offset = const Offset(0, 1),
    @required this.child,
  }) : super(key: key);

  final Widget child;
  final EdgeInsetsGeometry margin;
  final EdgeInsetsGeometry padding;
  final double circular;
  final Color shadowColor;
  final double spreadRadius;
  final double blurRadius;
  final Offset offset;
  final Color backgroundColor;

  @override
  Widget build(BuildContext context) {
    return Container(
      margin: margin,
      padding: padding,
      decoration: BoxDecoration(
        color: backgroundColor,
        borderRadius: BorderRadius.circular(circular),
        boxShadow: [
          BoxShadow(
            color: shadowColor,
            spreadRadius: spreadRadius,
            blurRadius: blurRadius,
            offset: offset,
          ),
        ],
      ),
      child: child,
    );
  }
}

How can I find out if I have Xcode commandline tools installed?

if you want to know the install version of Xcode as well as Swift language current version:

Use below simple command by using Terminal:

1. To get install Xcode Version

 xcodebuild -version

2. To get install Swift language Version

swift --version

What tools do you use to test your public REST API?

I am using DevHttpClient Plugin for chrome, its handy. it does also saves previous actions. clean UI as well

AngularJS resource promise

If you want to use asynchronous method you need to use callback function by $promise, here is example:

var Regions = $resource('mocks/regions.json');

$scope.regions = Regions.query();
$scope.regions.$promise.then(function (result) {
    $scope.regions = result;
});

This Activity already has an action bar supplied by the window decor

Just put parent="Theme.AppCompat.NoActionBar" in your style.xml file

Like - <style parent="Theme.AppCompat.NoActionBar" name="AppTheme.NoActionBar">

Why do I get the "Unhandled exception type IOException"?

Try again with this code snippet:

import java.io.*;

class IO {
    public static void main(String[] args) {    
        try {
            BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));    
            String userInput;    
            while ((userInput = stdIn.readLine()) != null) {
                System.out.println(userInput);
            }
        } catch(IOException ie) {
            ie.printStackTrace();
        }   
    }
}

Using try-catch-finally is better than using throws. Finding errors and debugging are easier when you use try-catch-finally.

Why std::cout instead of simply cout?

It seems possible your class may have been using pre-standard C++. An easy way to tell, is to look at your old programs and check, do you see:

#include <iostream.h>

#include <iostream>

The former is pre-standard, and you'll be able to just say cout as opposed to std::cout without anything additional. You can get the same behavior in standard C++ by adding

using std::cout;

using namespace std;

Just one idea, anyway.

Enum Naming Convention - Plural

In general, the best practice recommendation is singular, except for those enums that have the [Flags] attribute attached to them, (and which therefore can contain bit fields), which should be plural.

After reading your edited question, I get the feeling you may think the property name or variable name has to be different from the enum type name... It doesn't. The following is perfectly fine...

  public enum Status { New, Edited, Approved, Cancelled, Closed }

  public class Order
  {
      private Status stat;
      public Status Status
      { 
         get { return stat; }
         set { stat = value; }
      }
  }

How to rename a file using Python

os.rename(old, new)

This is found in the Python docs: http://docs.python.org/library/os.html

How do I print the type or class of a variable in Swift?

Please have a look at the below code snippet and let me know if you are looking for something like below or not.

var now = NSDate()
var soon = now.addingTimeInterval(5.0)

var nowDataType = Mirror(reflecting: now)
print("Now is of type: \(nowDataType.subjectType)")

var soonDataType = Mirror(reflecting: soon)
print("Soon is of type: \(soonDataType.subjectType)")

How to check if an environment variable exists and get its value?

If you don't care about the difference between an unset variable or a variable with an empty value, you can use the default-value parameter expansion:

foo=${DEPLOY_ENV:-default}

If you do care about the difference, drop the colon

foo=${DEPLOY_ENV-default}

You can also use the -v operator to explicitly test if a parameter is set.

if [[ ! -v DEPLOY_ENV ]]; then
    echo "DEPLOY_ENV is not set"
elif [[ -z "$DEPLOY_ENV" ]]; then
    echo "DEPLOY_ENV is set to the empty string"
else
    echo "DEPLOY_ENV has the value: $DEPLOY_ENV"
fi

How to get row index number in R?

I'm interpreting your question to be about getting row numbers.

You can try as.numeric(rownames(df)) if you haven't set the rownames. Otherwise use a sequence of 1:nrow(df).
The which() function converts a TRUE/FALSE row index into row numbers.

How to check how many letters are in a string in java?

If you are counting letters, the above solution will fail for some unicode symbols. For example for these 5 characters sample.length() will return 6 instead of 5:

String sample = "\u760c\u0444\u03b3\u03b5\ud800\udf45"; // ???e

The codePointCount function was introduced in Java 1.5 and I understand gives better results for glyphs etc

sample.codePointCount(0, sample.length()) // returns 5

http://globalizer.wordpress.com/2007/01/16/utf-8-and-string-length-limitations/

Removing whitespace between HTML elements when using line breaks

Flexbox can easily fix this old problem:

.image-wrapper {
  display: flex;
}

More information about flexbox: https://css-tricks.com/snippets/css/a-guide-to-flexbox/

How to fix "ImportError: No module named ..." error in Python?

Here is a step-by-step solution:

Add a script called run.py in /home/bodacydo/work/project and edit it like this:
```
import programs.my_python_program
programs.my_python_program.main()
```
(replace main() with your equivalent method in my_python_program.)
Go to /home/bodacydo/work/project
Run run.py

Explanation: Since python appends to PYTHONPATH the path of the script from which it runs, running run.py will append /home/bodacydo/work/project. And voilà, import foo.tasks will be found.

SQL Error: ORA-12899: value too large for column

As mentioned, the error message shows you the exact problem: you are passing 25 characters into a field set up to hold 20. You might also want to consider defining the columns a little more precisely. You can define whether the VARCHAR2 column will store a certain number of bytes or characters. You may encounter a problem in the future where you try to insert a multi byte character into the field, for example this is 5 characters in length but it won't fit into 5 bytes: 'ÀÈÌÕÛ'

Here is an example:

CREATE TABLE Customers(CustomerID  VARCHAR2(9 BYTE), ...

CREATE TABLE Customers(CustomerID  VARCHAR2(9 CHAR), ...

What is the proper use of an EventEmitter?

TL;DR:

No, don't subscribe manually to them, don't use them in services. Use them as is shown in the documentation only to emit events in components. Don't defeat angular's abstraction.

Answer:

No, you should not subscribe manually to it.

EventEmitter is an angular2 abstraction and its only purpose is to emit events in components. Quoting a comment from Rob Wormald

[...] EventEmitter is really an Angular abstraction, and should be used pretty much only for emitting custom Events in components. Otherwise, just use Rx as if it was any other library.

This is stated really clear in EventEmitter's documentation.

Use by directives and components to emit custom Events.

What's wrong about using it?

Angular2 will never guarantee us that EventEmitter will continue being an Observable. So that means refactoring our code if it changes. The only API we must access is its emit() method. We should never subscribe manually to an EventEmitter.

All the stated above is more clear in this Ward Bell's comment (recommended to read the article, and the answer to that comment). Quoting for reference

Do NOT count on EventEmitter continuing to be an Observable!

Do NOT count on those Observable operators being there in the future!

These will be deprecated soon and probably removed before release.

Use EventEmitter only for event binding between a child and parent component. Do not subscribe to it. Do not call any of those methods. Only call eve.emit()

His comment is in line with Rob's comment long time ago.

So, how to use it properly?

Simply use it to emit events from your component. Take a look a the following example.

@Component({
    selector : 'child',
    template : `
        <button (click)="sendNotification()">Notify my parent!</button>
    `
})
class Child {
    @Output() notifyParent: EventEmitter<any> = new EventEmitter();
    sendNotification() {
        this.notifyParent.emit('Some value to send to the parent');
    }
}

@Component({
    selector : 'parent',
    template : `
        <child (notifyParent)="getNotification($event)"></child>
    `
})
class Parent {
    getNotification(evt) {
        // Do something with the notification (evt) sent by the child!
    }
}

How not to use it?

class MyService {
    @Output() myServiceEvent : EventEmitter<any> = new EventEmitter();
}

Stop right there... you're already wrong...

Hopefully these two simple examples will clarify EventEmitter's proper usage.

Use of min and max functions in C++

By the way, in cstdlib there are __min and __max you can use.

For more: http://msdn.microsoft.com/zh-cn/library/btkhtd8d.aspx

How do I control how Emacs makes backup files?

Emacs backup/auto-save files can be very helpful. But these features are confusing.

Backup files

Backup files have tildes (~ or ~9~) at the end and shall be written to the user home directory. When make-backup-files is non-nil Emacs automatically creates a backup of the original file the first time the file is saved from a buffer. If you're editing a new file Emacs will create a backup the second time you save the file.

No matter how many times you save the file the backup remains unchanged. If you kill the buffer and then visit the file again, or the next time you start a new Emacs session, a new backup file will be made. The new backup reflects the file's content after reopened, or at the start of editing sessions. But an existing backup is never touched again. Therefore I find it useful to created numbered backups (see the configuration below).

To create backups explicitly use save-buffer (C-x C-s) with prefix arguments.

diff-backup and dired-diff-backup compares a file with its backup or vice versa. But there is no function to restore backup files. For example, under Windows, to restore a backup file

C:\Users\USERNAME\.emacs.d\backups\!drive_c!Users!USERNAME!.emacs.el.~7~

it has to be manually copied as

C:\Users\USERNAME\.emacs.el

Auto-save files

Auto-save files use hashmarks (#) and shall be written locally within the project directory (along with the actual files). The reason is that auto-save files are just temporary files that Emacs creates until a file is saved again (like with hurrying obedience).

Before the user presses C-x C-s (save-buffer) to save a file Emacs auto-saves files - based on counting keystrokes (auto-save-interval) or when you stop typing (auto-save-timeout).
Emacs also auto-saves whenever it crashes, including killing the Emacs job with a shell command.

When the user saves the file, the auto-saved version is deleted. But when the user exits the file without saving it, Emacs or the X session crashes, the auto-saved files still exist.

Use revert-buffer or recover-file to restore auto-save files. Note that Emacs records interrupted sessions for later recovery in files named ~/.emacs.d/auto-save-list. The recover-session function will use this information.

The preferred method to recover from an auto-saved filed is M-x revert-buffer RET. Emacs will ask either "Buffer has been auto-saved recently. Revert from auto-save file?" or "Revert buffer from file FILENAME?". In case of the latter there is no auto-save file. For example, because you have saved before typing another auto-save-intervall keystrokes, in which case Emacs had deleted the auto-save file.

Auto-save is nowadays disabled by default because it can slow down editing when connected to a slow machine, and because many files contain sensitive data.

Configuration

Here is a configuration that IMHO works best:

(defvar --backup-directory (concat user-emacs-directory "backups"))
(if (not (file-exists-p --backup-directory))
        (make-directory --backup-directory t))
(setq backup-directory-alist `(("." . ,--backup-directory)))
(setq make-backup-files t               ; backup of a file the first time it is saved.
      backup-by-copying t               ; don't clobber symlinks
      version-control t                 ; version numbers for backup files
      delete-old-versions t             ; delete excess backup files silently
      delete-by-moving-to-trash t
      kept-old-versions 6               ; oldest versions to keep when a new numbered backup is made (default: 2)
      kept-new-versions 9               ; newest versions to keep when a new numbered backup is made (default: 2)
      auto-save-default t               ; auto-save every buffer that visits a file
      auto-save-timeout 20              ; number of seconds idle time before auto-save (default: 30)
      auto-save-interval 200            ; number of keystrokes between auto-saves (default: 300)
      )

Sensitive data

Another problem is that you don't want to have Emacs spread copies of files with sensitive data. Use this mode on a per-file basis. As this is a minor mode, for my purposes I renamed it sensitive-minor-mode.

To enable it for all .vcf and .gpg files, in your .emacs use something like:

(setq auto-mode-alist
      (append
       (list
        '("\\.\\(vcf\\|gpg\\)$" . sensitive-minor-mode)
        )
       auto-mode-alist))

Alternatively, to protect only some files, like some .txt files, use a line like

// -*-mode:asciidoc; mode:sensitive-minor; fill-column:132-*-

in the file.

scale fit mobile web content using viewport meta tag

ok, here is my final solution with 100% native javascript:

<meta id="viewport" name="viewport">

<script type="text/javascript">
//mobile viewport hack
(function(){

  function apply_viewport(){
    if( /Android|webOS|iPhone|iPad|iPod|BlackBerry/i.test(navigator.userAgent)   ) {

      var ww = window.screen.width;
      var mw = 800; // min width of site
      var ratio =  ww / mw; //calculate ratio
      var viewport_meta_tag = document.getElementById('viewport');
      if( ww < mw){ //smaller than minimum size
        viewport_meta_tag.setAttribute('content', 'initial-scale=' + ratio + ', maximum-scale=' + ratio + ', minimum-scale=' + ratio + ', user-scalable=no, width=' + mw);
      }
      else { //regular size
        viewport_meta_tag.setAttribute('content', 'initial-scale=1.0, maximum-scale=1, minimum-scale=1.0, user-scalable=yes, width=' + ww);
      }
    }
  }

  //ok, i need to update viewport scale if screen dimentions changed
  window.addEventListener('resize', function(){
    apply_viewport();
  });

  apply_viewport();

}());
</script>

VBA - Select columns using numbers?

In this way, you can start to select data even behind column "Z" and select a lot of columns.

Sub SelectColumNums()
    Dim xCol1 As Integer, xNumOfCols as integer
    xCol1 = 26
    xNumOfCols = 17
    Range(Columns(xCol1), Columns(xCol1 + xNumOfCols)).Select
End Sub

Sorting data based on second column of a file

Use sort.

sort ... -k 2,2 ...

websocket.send() parameter

As I understand it, you want the server be able to send messages through from client 1 to client 2. You cannot directly connect two clients because one of the two ends of a WebSocket connection needs to be a server.

This is some pseudocodish JavaScript:

Client:

var websocket = new WebSocket("server address");

websocket.onmessage = function(str) {
  console.log("Someone sent: ", str);
};

// Tell the server this is client 1 (swap for client 2 of course)
websocket.send(JSON.stringify({
  id: "client1"
}));

// Tell the server we want to send something to the other client
websocket.send(JSON.stringify({
  to: "client2",
  data: "foo"
}));

Server:

var clients = {};

server.on("data", function(client, str) {
  var obj = JSON.parse(str);

  if("id" in obj) {
    // New client, add it to the id/client object
    clients[obj.id] = client;
  } else {
    // Send data to the client requested
    clients[obj.to].send(obj.data);
  }
});

Is the server running on host "localhost" (::1) and accepting TCP/IP connections on port 5432?

I have faced the same issue and I was unable to start the postgresql server and was unable to access my db even after giving password, and I have been doing all the possible ways.

This solution worked for me,

For the Ubuntu users: Through command line, type the following commands:

1.service --status-all (which gives list of all services and their status. where "+" refers to running and "-" refers that the service is no longer running)

check for postgresql status, if its "-" then type the following command

2.systemctl start postgresql (starts the server again)

refresh the postgresql page in browser, and it works

For the Windows users:

Search for services, where we can see list of services and the right click on postgresql, click on start and server works perfectly fine.

Git Stash vs Shelve in IntelliJ IDEA

In addition to previous answers there is one important for me note:

shelve is JetBrains products feature (such as WebStorm, PhpStorm, PyCharm, etc.). It puts shelved files into .idea/shelf directory.

stash is one of git options. It puts stashed files under the .git directory.

jinja2.exceptions.TemplateNotFound error

I think you shouldn't prepend themesDir. You only pass the filename of the template to flask, it will then look in a folder called templates relative to your python file.

Fatal error: Call to undefined function imap_open() in PHP

To install IMAP on PHP 7.0.32 on Ubuntu 16.04. Go to the given link and based on your area select link. In my case, I select a link from the Asia section. Then a file will be downloaded. just click on the file to install IMAP .Then restart apache

https://packages.ubuntu.com/xenial/all/php-imap/download.

to check if IMAP is installed check phpinfo file.incase of successful installation IMAP c-Client Version 2007f will be shown.

SQL Server Format Date DD.MM.YYYY HH:MM:SS

A quick way to do it in sql server 2012 is as follows:

SELECT FORMAT(GETDATE() , 'dd/MM/yyyy HH:mm:ss')

How to select a drop-down menu value with Selenium using Python?

The best way to use selenium.webdriver.support.ui.Select class to work to with dropdown selection but some time it does not work as expected due to designing issue or other issues of the HTML.

In this type of situation you can also prefer as alternate solution using execute_script() as below :-

option_visible_text = "Banana"
select = driver.find_element_by_id("fruits01")

#now use this to select option from dropdown by visible text 
driver.execute_script("var select = arguments[0]; for(var i = 0; i < select.options.length; i++){ if(select.options[i].text == arguments[1]){ select.options[i].selected = true; } }", select, option_visible_text);

Correct way to work with vector of arrays

Every element of your vector is a float[4], so when you resize every element needs to default initialized from a float[4]. I take it you tried to initialize with an int value like 0?

Try:

static float zeros[4] = {0.0, 0.0, 0.0, 0.0};
myvector.resize(newsize, zeros);

How to return dictionary keys as a list in Python?

Python >= 3.5 alternative: unpack into a list literal [*newdict]

New unpacking generalizations (PEP 448) were introduced with Python 3.5 allowing you to now easily do:

>>> newdict = {1:0, 2:0, 3:0}
>>> [*newdict]
[1, 2, 3]

Unpacking with * works with any object that is iterable and, since dictionaries return their keys when iterated through, you can easily create a list by using it within a list literal.

Adding .keys() i.e [*newdict.keys()] might help in making your intent a bit more explicit though it will cost you a function look-up and invocation. (which, in all honesty, isn't something you should really be worried about).

_{The *iterable syntax is similar to doing list(iterable) and its behaviour was initially documented in the Calls section of the Python Reference manual. With PEP 448 the restriction on where *iterable could appear was loosened allowing it to also be placed in list, set and tuple literals, the reference manual on Expression lists was also updated to state this.}

Though equivalent to list(newdict) with the difference that it's faster (at least for small dictionaries) because no function call is actually performed:

%timeit [*newdict]
1000000 loops, best of 3: 249 ns per loop

%timeit list(newdict)
1000000 loops, best of 3: 508 ns per loop

%timeit [k for k in newdict]
1000000 loops, best of 3: 574 ns per loop

with larger dictionaries the speed is pretty much the same (the overhead of iterating through a large collection trumps the small cost of a function call).

In a similar fashion, you can create tuples and sets of dictionary keys:

>>> *newdict,
(1, 2, 3)
>>> {*newdict}
{1, 2, 3}

beware of the trailing comma in the tuple case!

Get element by id - Angular2

(<HTMLInputElement>document.getElementById('loginInput')).value = '123';

Angular cannot take HTML elements directly thereby you need to specify the element type by binding the above generic to it.

UPDATE::

This can also be done using ViewChild with #localvariable as shown here, as mentioned in here

<textarea  #someVar  id="tasknote"
                  name="tasknote"
                  [(ngModel)]="taskNote"
                  placeholder="{{ notePlaceholder }}"
                  style="background-color: pink"
                  (blur)="updateNote() ; noteEditMode = false " (click)="noteEditMode = false"> {{ todo.note }} 

</textarea>

import {ElementRef,Renderer2} from '@angular/core';
@ViewChild('someVar') el:ElementRef;

constructor(private rd: Renderer2) {}

ngAfterViewInit() {
      console.log(this.rd); 
      this.el.nativeElement.focus();      //<<<=====same as oldest way
}

"The system cannot find the file C:\ProgramData\Oracle\Java\javapath\java.exe"

Why Oracle did such a poor way to point to java is beyond me. We solved this problem by creating a new link to the JDK

mklink /d C:\ProgramData\Oracle\Java\javapath "C:\Program Files\Java\jdk1.8.0_40\bin\"

The same would work for a JRE if that is all that is required.

This replaces the old symlinks in C:\ProgramData\Oracle\Java\javapath (if they existed previously)

Why is it faster to check if dictionary contains the key, rather than catch the exception in case it doesn't?

Dictionaries are specifically designed to do super fast key lookups. They are implemented as hashtables and the more entries the faster they are relative to other methods. Using the exception engine is only supposed to be done when your method has failed to do what you designed it to do because it is a large set of object that give you a lot of functionality for handling errors. I built an entire library class once with everything surrounded by try catch blocks once and was appalled to see the debug output which contained a seperate line for every single one of over 600 exceptions!

What dependency is missing for org.springframework.web.bind.annotation.RequestMapping?

Sometimes there is some error in the local Maven repo. So please close your eclipse and delete the jar spring-webmvc from your local .m2 then open Eclipse and on the project press Update Maven Dependencies.

Then Eclipse will download the dependency again for you. That how I fixed the same problem.

How to convert const char* to char* in C?

First of all you should do such things only if it is really necessary - e.g. to use some old-style API with char* arguments which are not modified. If an API function modifies the string which was const originally, then this is unspecified behaviour, very likely crash.

Use cast:

(char*)const_char_ptr

Illegal mix of collations error in MySql

You need to change each column Collation from latin1_general_ci to latin1_swedish_ci

how to redirect to home page

_x000D_

var url = location.href;_x000D_
var newurl = url.replace('some-domain.com','another-domain.com';);_x000D_
location.href=newurl;

_x000D_

See this answer https://stackoverflow.com/a/42291014/3901511

convert epoch time to date

EDIT: Okay, so you don't want your local time (which isn't Australia) to contribute to the result, but instead the Australian time zone. Your existing code should be absolutely fine then, although Sydney is currently UTC+11, not UTC+10.. Short but complete test app:

import java.util.*;
import java.text.*;

public class Test {
    public static void main(String[] args) throws InterruptedException {
        Date date = new Date(1318386508000L);
        DateFormat format = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
        format.setTimeZone(TimeZone.getTimeZone("Etc/UTC"));
        String formatted = format.format(date);
        System.out.println(formatted);
        format.setTimeZone(TimeZone.getTimeZone("Australia/Sydney"));
        formatted = format.format(date);
        System.out.println(formatted);
    }
}

Output:

12/10/2011 02:28:28
12/10/2011 13:28:28

I would also suggest you start using Joda Time which is simply a much nicer date/time API...

EDIT: Note that if your system doesn't know about the Australia/Sydney time zone, it would show UTC. For example, if I change the code about to use TimeZone.getTimeZone("blah/blah") it will show the UTC value twice. I suggest you print TimeZone.getTimeZone("Australia/Sydney").getDisplayName() and see what it says... and check your code for typos too :)

How can I initialize a C# List in the same line I declare it. (IEnumerable string Collection Example)

Just lose the parenthesis:

var nameslist = new List<string> { "one", "two", "three" };

super() raises "TypeError: must be type, not classobj" for new-style class

Alright, it's the usual "super() cannot be used with an old-style class".

However, the important point is that the correct test for "is this a new-style instance (i.e. object)?" is

>>> class OldStyle: pass
>>> instance = OldStyle()
>>> issubclass(instance.__class__, object)
False

and not (as in the question):

>>> isinstance(instance, object)
True

For classes, the correct "is this a new-style class" test is:

>>> issubclass(OldStyle, object)  # OldStyle is not a new-style class
False
>>> issubclass(int, object)  # int is a new-style class
True

The crucial point is that with old-style classes, the class of an instance and its type are distinct. Here, OldStyle().__class__ is OldStyle, which does not inherit from object, while type(OldStyle()) is the instance type, which does inherit from object. Basically, an old-style class just creates objects of type instance (whereas a new-style class creates objects whose type is the class itself). This is probably why the instance OldStyle() is an object: its type() inherits from object (the fact that its class does not inherit from object does not count: old-style classes merely construct new objects of type instance). Partial reference: https://stackoverflow.com/a/9699961/42973.

PS: The difference between a new-style class and an old-style one can also be seen with:

>>> type(OldStyle)  # OldStyle creates objects but is not itself a type
classobj
>>> isinstance(OldStyle, type)
False
>>> type(int)  # A new-style class is a type
type

(old-style classes are not types, so they cannot be the type of their instances).

How to preserve aspect ratio when scaling image using one (CSS) dimension in IE6?

I'm glad that worked out, so I guess you had to explicitly set 'auto' on IE6 in order for it to mimic other browsers!

I actually recently found another technique for scaling images, again designed for backgrounds. This technique has some interesting features:

The image aspect ratio is preserved
The image's original size is maintained (that is, it can never shrink only grow)

The markup relies on a wrapper element:

<div id="wrap"><img src="test.png" /></div>

Given the above markup you then use these rules:

#wrap {
  height: 100px;
  width: 100px;
}
#wrap img {
  min-height: 100%;
  min-width: 100%;
}

If you then control the size of wrapper you get the interesting scale effects that I list above.

To be explicit, consider the following base state: A container that is 100x100 and an image that is 10x10. The result is a scaled image of 100x100.

Starting at the base state, the container resized to 20x100, the image stays resized at 100x100.
Starting at the base state, the image is changed to 10x20, the image resizes to 100x200.

So, in other words, the image is always at least as big as the container, but will scale beyond it to maintain it's aspect ratio.

This probably isn't useful for your site, and it doesn't work in IE6. But, it is useful to get a scaled background for your view port or container.

Django - Static file not found

Another error can be not having your app listed in the INSTALLED_APPS listing like:

INSTALLED_APPS = [
    # ...
    'your_app',
]

Without having it in, you can face problems like not detecting your static files, basically all the files involving your app. Even though it can be correct as suggested in the correct answer by using:

STATICFILES_DIRS = (adding/path/of/your/app)

Can be one of the errors and should be reviewed if getting this error.

How do I specify row heights in CSS Grid layout?

One of the Related posts gave me the (simple) answer.

Apparently the auto value on the grid-template-rows property does exactly what I was looking for.

.grid {
    display:grid;
    grid-template-columns: 1fr 1.5fr 1fr;
    grid-template-rows: auto auto 1fr 1fr 1fr auto auto;
    grid-gap:10px;
    height: calc(100vh - 10px);
}

Using C# to read/write Excel files (.xls/.xlsx)

If you are doing simple manipulation and can tie yourself to xlsx then you can look into manipulating the XML yourself. I have done it and found it to be faster than grokking the excel libs.

There are also 3rd party libs that can be easier to use... and can be used on the server which MS's can't.

How to remove the querystring and get only the url?

You can try:

<?php
$this_page = basename($_SERVER['REQUEST_URI']);
if (strpos($this_page, "?") !== false) $this_page = reset(explode("?", $this_page));
?>

How to call a function after a div is ready?

To do something after certain div load from function .load(). I think this exactly what you need:

  $('#divIDer').load(document.URL +  ' #divIDer',function() {

       // call here what you want .....


       //example
       $('#mydata').show();
  });

Tower of Hanoi: Recursive Algorithm

Think of it as a stack with the disks diameter being represented by integers (4,3,2,1) The first recursion call will be called 3 times and thus filling the run-time stack as follows

first call : 1. Second call : 2,1. and third call: 3,2,1.

After the first recursion ends, the contents of the run-time stack is popped to the middle pole from largest diameter to smallest (first in last out). Next, disk with diameter 4 is moved to the destination.

The second recursion call is the same as the first with the exception of moving the elements from the middle pole to destination.

Laravel Update Query

It is very simple to do. Code are given below :

 DB::table('user')->where('email', $userEmail)->update(array('member_type' => $plan));

CSS to keep element at "fixed" position on screen

The easiest way is to use position: fixed:

.element {
  position: fixed;
  bottom: 0;
  right: 0;
}

http://www.w3.org/TR/CSS21/visuren.html#choose-position

(note that position fixed is buggy / doesn't work on ios and android browsers)

How to know if other threads have finished?

Solution using CyclicBarrier

public class Downloader {
  private CyclicBarrier barrier;
  private final static int NUMBER_OF_DOWNLOADING_THREADS;

  private DownloadingThread extends Thread {
    private final String url;
    public DownloadingThread(String url) {
      super();
      this.url = url;
    }
    @Override
    public void run() {
      barrier.await(); // label1
      download(url);
      barrier.await(); // label2
    }
  }
  public void startDownload() {
    // plus one for the main thread of execution
    barrier = new CyclicBarrier(NUMBER_OF_DOWNLOADING_THREADS + 1); // label0
    for (int i = 0; i < NUMBER_OF_DOWNLOADING_THREADS; i++) {
      new DownloadingThread("http://www.flickr.com/someUser/pic" + i + ".jpg").start();
    }
    barrier.await(); // label3
    displayMessage("Please wait...");
    barrier.await(); // label4
    displayMessage("Finished");
  }
}

label0 - cyclic barrier is created with number of parties equal to the number of executing threads plus one for the main thread of execution (in which startDownload() is being executed)

label 1 - n-th DownloadingThread enters the waiting room

label 3 - NUMBER_OF_DOWNLOADING_THREADS have entered the waiting room. Main thread of execution releases them to start doing their downloading jobs in more or less the same time

label 4 - main thread of execution enters the waiting room. This is the 'trickiest' part of the code to understand. It doesn't matter which thread will enter the waiting room for the second time. It is important that whatever thread enters the room last ensures that all the other downloading threads have finished their downloading jobs.

label 2 - n-th DownloadingThread has finished its downloading job and enters the waiting room. If it is the last one i.e. already NUMBER_OF_DOWNLOADING_THREADS have entered it, including the main thread of execution, main thread will continue its execution only when all the other threads have finished downloading.

jQuery loop over JSON result from AJAX Success?

This is what I came up with to easily view all data values:

_x000D_

var dataItems = "";_x000D_
$.each(data, function (index, itemData) {_x000D_
    dataItems += index + ": " + itemData + "\n";_x000D_
});_x000D_
console.log(dataItems);

_x000D_

PHP 7 RC3: How to install missing MySQL PDO

Had the same issue, resolved by actually enabling the extension in the php.ini with the right file name. It was listed as php_pdo_mysql.so but the module name in /lib/php/modules was called just pdo_mysql.so

So just remove the "php_" prefix from the php.ini file and then restart the httpd service and it worked like a charm.

Please note that I'm using Arch and thus path names and services may be different depending on your distrubution.

How to change onClick handler dynamically?

Use .onclick (all lowercase). Like so:

document.getElementById("foo").onclick = function () {
  alert('foo'); // do your stuff
  return false; // <-- to suppress the default link behaviour
};

Actually, you'll probably find yourself way better off using some good library (I recommend jQuery for several reasons) to get you up and running, and writing clean javascript.

Cross-browser (in)compatibilities are a right hell to deal with for anyone - let alone someone who's just starting.

Variable not accessible when initialized outside function

It really depends on where your JavaScript code is located.

The problem is probably caused by the DOM not being loaded when the line

var systemStatus = document.getElementById("system-status");

is executed. You could try calling this in an onload event, or ideally use a DOM ready type event from a JavaScript framework.

angular 2 sort and filter

Here is a simple filter pipe for array of objects that contain attributes with string values (ES6)

filter-array-pipe.js

import {Pipe} from 'angular2/core';

// # Filter Array of Objects
@Pipe({ name: 'filter' })
export class FilterArrayPipe {
  transform(value, args) {
    if (!args[0]) {
      return value;
    } else if (value) {
      return value.filter(item => {
        for (let key in item) {
          if ((typeof item[key] === 'string' || item[key] instanceof String) && 
              (item[key].indexOf(args[0]) !== -1)) {
            return true;
          }
        }
      });
    }
  }
}

Your component

myobjComponent.js

import {Component} from 'angular2/core';
import {HTTP_PROVIDERS, Http} from 'angular2/http';
import {FilterArrayPipe} from 'filter-array-pipe';

@Component({
  templateUrl: 'myobj.list.html',
  providers: [HTTP_PROVIDERS],
  pipes: [FilterArrayPipe]
})
export class MyObjList {
  static get parameters() {
    return [[Http]];
  }
  constructor(_http) {
    _http.get('/api/myobj')
      .map(res => res.json())
      .subscribe(
        data => this.myobjs = data,
        err => this.logError(err))
      );
  }
  resetQuery(){
    this.query = '';
  }
}

In your template

myobj.list.html

<input type="text" [(ngModel)]="query" placeholder="... filter" > 
<div (click)="resetQuery()"> <span class="icon-cross"></span> </div>
</div>
<ul><li *ngFor="#myobj of myobjs| filter:query">...<li></ul>

What is a good way to handle exceptions when trying to read a file in python?

I guess I misunderstood what was being asked. Re-re-reading, it looks like Tim's answer is what you want. Let me just add this, however: if you want to catch an exception from open, then open has to be wrapped in a try. If the call to open is in the header of a with, then the with has to be in a try to catch the exception. There's no way around that.

So the answer is either: "Tim's way" or "No, you're doing it correctly.".

_{Previous unhelpful answer to which all the comments refer:}

import os

if os.path.exists(fName):
   with open(fName, 'rb') as f:
       try:
           # do stuff
       except : # whatever reader errors you care about
           # handle error

pandas loc vs. iloc vs. at vs. iat?

Updated for pandas 0.20 given that ix is deprecated. This demonstrates not only how to use loc, iloc, at, iat, set_value, but how to accomplish, mixed positional/label based indexing.

loc - label based
Allows you to pass 1-D arrays as indexers. Arrays can be either slices (subsets) of the index or column, or they can be boolean arrays which are equal in length to the index or columns.

Special Note: when a scalar indexer is passed, loc can assign a new index or column value that didn't exist before.

# label based, but we can use position values
# to get the labels from the index object
df.loc[df.index[2], 'ColName'] = 3

df.loc[df.index[1:3], 'ColName'] = 3

iloc - position based
Similar to loc except with positions rather that index values. However, you cannot assign new columns or indices.

# position based, but we can get the position
# from the columns object via the `get_loc` method
df.iloc[2, df.columns.get_loc('ColName')] = 3

df.iloc[2, 4] = 3

df.iloc[:3, 2:4] = 3

at - label based
Works very similar to loc for scalar indexers. Cannot operate on array indexers. Can! assign new indices and columns.

Advantage over loc is that this is faster.
Disadvantage is that you can't use arrays for indexers.

# label based, but we can use position values
# to get the labels from the index object
df.at[df.index[2], 'ColName'] = 3

df.at['C', 'ColName'] = 3

iat - position based
Works similarly to iloc. Cannot work in array indexers. Cannot! assign new indices and columns.

Advantage over iloc is that this is faster.
Disadvantage is that you can't use arrays for indexers.

# position based, but we can get the position
# from the columns object via the `get_loc` method
IBM.iat[2, IBM.columns.get_loc('PNL')] = 3

set_value - label based
Works very similar to loc for scalar indexers. Cannot operate on array indexers. Can! assign new indices and columns

Advantage Super fast, because there is very little overhead!
Disadvantage There is very little overhead because pandas is not doing a bunch of safety checks. Use at your own risk. Also, this is not intended for public use.

# label based, but we can use position values
# to get the labels from the index object
df.set_value(df.index[2], 'ColName', 3)

set_value with takable=True - position based
Works similarly to iloc. Cannot work in array indexers. Cannot! assign new indices and columns.

# position based, but we can get the position
# from the columns object via the `get_loc` method
df.set_value(2, df.columns.get_loc('ColName'), 3, takable=True)

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