Cannot install packages inside docker Ubuntu image

It is because there is no package cache in the image, you need to run:

apt-get update

before installing packages, and if your command is in a Dockerfile, you'll then need:

apt-get -y install curl

To suppress the standard output from a command use -qq. E.g.

apt-get -qq -y install curl

Can we rely on String.isEmpty for checking null condition on a String in Java?

You can't use String.isEmpty() if it is null. Best is to have your own method to check null or empty.

public static boolean isBlankOrNull(String str) {
    return (str == null || "".equals(str.trim()));
}

Spring-Security-Oauth2: Full authentication is required to access this resource

You should pre authenticate the token apis "/oauth/token"

extend ResourceServerConfigurerAdapter and override configure function to do this.

eg:

http.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS).and().authorizeRequests().antMatchers("/oauth/token").permitAll().
anyRequest().authenticated();

How to set only time part of a DateTime variable in C#

It isn't possible as DateTime is immutable. The same discussion is available here: How to change time in datetime?

jQuery - What are differences between $(document).ready and $(window).load?

From the jQuery API Document

While JavaScript provides the load event for executing code when a page is rendered, this event does not get triggered until all assets such as images have been completely received. In most cases, the script can be run as soon as the DOM hierarchy has been fully constructed. The handler passed to .ready() is guaranteed to be executed after the DOM is ready, so this is usually the best place to attach all other event handlers and run other jQuery code. When using scripts that rely on the value of CSS style properties, it's important to reference external stylesheets or embed style elements before referencing the scripts.

In cases where code relies on loaded assets (for example, if the dimensions of an image are required), the code should be placed in a handler for the load event instead.

Answer to the second question -

No, they are identical as long as you are not using jQuery in no conflict mode.

Connection refused on docker container

In Docker Quickstart Terminal run following command: $ docker-machine ip 192.168.99.100

How to make Bootstrap 4 cards the same height in card-columns?

You can either put the classes on the "row" or the "column"? Won't be visible on the cards (border) if you use it on the row. https://v4-alpha.getbootstrap.com/utilities/flexbox/#align-items

<div class="container">
    <div class="row">
          <div class="col-lg-4 d-flex align-items-stretch">

Some of the other answers here seem 'wacky'. Why would use a min-height or even worse a fixed height?

I thought this issue (equal heights) was part of the reason for progression away from floating block divs?

XML parsing of a variable string in JavaScript

You can also through the jquery function($.parseXML) to manipulate xml string

example javascript:

var xmlString = '<languages><language name="c"></language><language name="php"></language></languages>';
var xmlDoc = $.parseXML(xmlString);
$(xmlDoc).find('name').each(function(){
    console.log('name:'+$(this).attr('name'))
})

Eloquent: find() and where() usage laravel

Your code looks fine, but there are a couple of things to be aware of:

Post::find($id); acts upon the primary key, if you have set your primary key in your model to something other than id by doing:

protected  $primaryKey = 'slug';

then find will search by that key instead.

Laravel also expects the id to be an integer, if you are using something other than an integer (such as a string) you need to set the incrementing property on your model to false:

public $incrementing = false;

Check for column name in a SqlDataReader object

public static bool DataViewColumnExists(DataView dv, string columnName)
{
    return DataTableColumnExists(dv.Table, columnName);
}

public static bool DataTableColumnExists(DataTable dt, string columnName)
{
    string DebugTrace = "Utils::DataTableColumnExists(" + dt.ToString() + ")";
    try
    {
        return dt.Columns.Contains(columnName);
    }
    catch (Exception ex)
    {
        throw new MyExceptionHandler(ex, DebugTrace);
    }
}

Columns.Contains is case-insensitive btw.

Using new line(\n) in string and rendering the same in HTML

You could use a pre tag instead of a div. This would automatically display your \n's in the correct way.

<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
         var display_txt = "1st line text" +"\n" + "2nd line text";
         $('#somediv').html(display_txt).css("color", "green");
});
</script>
</head>
<body>

<pre>
<p id="somediv"></p>
</pre>

</body>
</html>

How do you setLayoutParams() for an ImageView?

You need to set the LayoutParams of the ViewGroup the ImageView is sitting in. For example if your ImageView is inside a LinearLayout, then you create a

LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(30, 30);
yourImageView.setLayoutParams(layoutParams);

This is because it's the parent of the View that needs to know what size to allocate to the View.

Return generated pdf using spring MVC

You were on the right track with response.getOutputStream(), but you're not using its output anywhere in your code. Essentially what you need to do is to stream the PDF file's bytes directly to the output stream and flush the response. In Spring you can do it like this:

@RequestMapping(value="/getpdf", method=RequestMethod.POST)
public ResponseEntity<byte[]> getPDF(@RequestBody String json) {
    // convert JSON to Employee 
    Employee emp = convertSomehow(json);

    // generate the file
    PdfUtil.showHelp(emp);

    // retrieve contents of "C:/tmp/report.pdf" that were written in showHelp
    byte[] contents = (...);

    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_PDF);
    // Here you have to set the actual filename of your pdf
    String filename = "output.pdf";
    headers.setContentDispositionFormData(filename, filename);
    headers.setCacheControl("must-revalidate, post-check=0, pre-check=0");
    ResponseEntity<byte[]> response = new ResponseEntity<>(contents, headers, HttpStatus.OK);
    return response;
}

Notes:

use meaningful names for your methods: naming a method that writes a PDF document showHelp is not a good idea
reading a file into a byte[]: example here
I'd suggest adding a random string to the temporary PDF file name inside showHelp() to avoid overwriting the file if two users send a request at the same time

How can I apply styles to multiple classes at once?

Don’t Repeat Your CSS

 a.abc, a.xyz{
    margin-left:20px;
 }

 a{
    margin-left:20px;
 }

How to automatically close cmd window after batch file execution?

To close the current cmd windows immediately, just add as the last command/line:

move nul 2>&0

Try move nul to nowhere and redirect the stderr to stdin will result in the current window cmd.exe being closed

This is different from closing a bat, or exiting it using goto :EOF or Exit /b

TINYTEXT, TEXT, MEDIUMTEXT, and LONGTEXT maximum storage sizes

This is nice but doesn't answer the question:

"A VARCHAR should always be used instead of TINYTEXT." Tinytext is useful if you have wide rows - since the data is stored off the record. There is a performance overhead, but it does have a use.

Table cell widths - fixing width, wrapping/truncating long words

Stack Overflow has solved a similar problem with long lines of code by using a DIV and having overflow-x:auto. CSS can't break up words for you.

Creating random colour in Java?

Copy paste this for bright pastel rainbow colors

int R = (int)(Math.random()*256);
int G = (int)(Math.random()*256);
int B= (int)(Math.random()*256);
Color color = new Color(R, G, B); //random color, but can be bright or dull

//to get rainbow, pastel colors
Random random = new Random();
final float hue = random.nextFloat();
final float saturation = 0.9f;//1.0 for brilliant, 0.0 for dull
final float luminance = 1.0f; //1.0 for brighter, 0.0 for black
color = Color.getHSBColor(hue, saturation, luminance);

Laravel 4 with Sentry 2 add user to a group on Registration

Somehow, where you are using Sentry, you're not using its Facade, but the class itself. When you call a class through a Facade you're not really using statics, it's just looks like you are.

Do you have this:

use Cartalyst\Sentry\Sentry;

In your code?

Ok, but if this line is working for you:

$user = $this->sentry->register(array(     'username' => e($data['username']),     'email' => e($data['email']),      'password' => e($data['password'])     ));

So you already have it instantiated and you can surely do:

$adminGroup = $this->sentry->findGroupById(5);

Div vertical scrollbar show

Always : If you always want vertical scrollbar, use overflow-y: scroll;

jsFiddle:

<div style="overflow-y: scroll;">
......
</div>

When needed: If you only want vertical scrollbar when needed, use overflow-y: auto; (You need to specify a height in this case)

jsFiddle:

<div style="overflow-y: auto; height:150px; ">
....
</div>

reading HttpwebResponse json response, C#

If you're getting source in Content Use the following method

try
{
    var response = restClient.Execute<List<EmpModel>>(restRequest);

    var jsonContent = response.Content;

    var data = JsonConvert.DeserializeObject<List<EmpModel>>(jsonContent);

    foreach (EmpModel item in data)
    {
        listPassingData?.Add(item);
    }
}
catch (Exception ex)
{
    Console.WriteLine($"Data get mathod problem {ex} ");
}

jQuery DataTables Getting selected row values

var table = $('#myTableId').DataTable();
var a= [];
$.each(table.rows('.myClassName').data(), function() {
a.push(this["productId"]);
});

console.log(a[0]);

using jQuery .animate to animate a div from right to left?

If you know the width of the child element you are animating, you can use and animate a margin offset as well. For example, this will animate from left:0 to right:0

CSS:

.parent{
width:100%;
position:relative;
}

#itemToMove{
position:absolute;
width:150px;
right:100%;
margin-right:-150px;
}

Javascript:

$( "#itemToMove" ).animate({
"margin-right": "0",
"right": "0"
}, 1000 );

Concatenating two std::vectors

You can prepare your own template for + operator:

template <typename T> 
inline T operator+(const T & a, const T & b)
{
    T res = a;
    res.insert(res.end(), b.begin(), b.end());
    return res;
}

Next thing - just use +:

vector<int> a{1, 2, 3, 4};
vector<int> b{5, 6, 7, 8};
for (auto x: a + b)
    cout << x << " ";
cout << endl;

This example gives output:

1 2 3 4 5 6 7 8

How to find a whole word in a String in java

Try to match using regular expressions. Match for "\b123wood\b", \b is a word break.

Alternate output format for psql

If you are looking for psql command-line mode like me, here is the syntax --pset expanded=auto

Quoted it here

psql command-line options:
-P expanded=auto
--pset expanded=auto
-x
--expanded

Another 2nd way is -q option ref

How to increment variable under DOS?

Coming to the party very very late, but from my old memory of DOS batch files, you can keep adding a character to the string each loop then look for a string of that many of that character. for 250 iterations, you either have a very long "cycles" string, or you have one loop inside using one set of variables counting to 10, then another loop outside that uses another set of variable counting to 25.

Here is the basic loop to 30:

@echo off
rem put how many dots you want to loop
set cycles=..............................
set cntr=
:LOOP
set cntr=%cntr%.
echo around we go again
if "%cycles%"=="%cntr%" goto done
goto loop
:DONE
echo around we went

Creating virtual directories in IIS express

If you're using Visual Studio 2013 (may require Pro edition or higher), I was able to add a virtual directory to an IIS Express (file-based) website by right-clicking on the website in the Solution Explorer and clicking Add > New Virtual Directory. This added an entry to the applicationhost.config file as with the manual methods described here.

SQL Developer with JDK (64 bit) cannot find JVM

This is because sqldeveloper.conf has an entry for the java home being used

look at this solution

Copy rows from one table to another, ignoring duplicates

I realize this is old, but I got here from google and after reviewing the accepted answer I did my own statement and it worked for me hope someone will find it useful:

    INSERT IGNORE INTO destTable SELECT id, field2,field3... FROM origTable

Edit: This works on MySQL I did not test on MSSQL

Web link to specific whatsapp contact

From the Official Whatsapp FAQ: https://faq.whatsapp.com/en/android/26000030/

WhatsApp's Click to Chat feature allows you to begin a chat with someone without having their phone number saved in your phone's address book. As long as you know this person’s phone number, you can create a link that will allow you to start a chat with them. By clicking the link, a chat with the person automatically opens. Click to Chat works on both your phone and WhatsApp Web.

To create your own link, use https://wa.me/ where the is a full phone number in international format. Omit any zeroes, brackets or dashes when adding the phone number in international format. For a detailed explanation on international numbers, read this article. Please keep in mind that this phone number must have an active account on WhatsApp.

Use: https://wa.me/15551234567

Don't use: https://wa.me/+001-(555)1234567

How to perform a for loop on each character in a string in Bash?

Another approach, if you don't care about whitespace being ignored:

for char in $(sed -E s/'(.)'/'\1 '/g <<<"$your_string"); do
    # Handle $char here
done

Renaming Columns in an SQL SELECT Statement

you have to rename each column

SELECT col1 as MyCol1,
       col2 as MyCol2,
 .......
 FROM `foobar`

Link error "undefined reference to `__gxx_personality_v0'" and g++

If g++ still gives error Try using:

g++ file.c -lstdc++

Look at this post: What is __gxx_personality_v0 for?

Make sure -lstdc++ is at the end of the command. If you place it at the beginning (i.e. before file.c), you still can get this same error.

What does '?' do in C++?

It's the conditional operator.

a ? b : c

It's a shortcut for IF/THEN/ELSE.

means: if a is true, return b, else return c. In this case, if f==r, return 1, else return 0.

Link to Flask static files with url_for

You have by default the static endpoint for static files. Also Flask application has the following arguments:

static_url_path: can be used to specify a different path for the static files on the web. Defaults to the name of the static_folder folder.

static_folder: the folder with static files that should be served at static_url_path. Defaults to the 'static' folder in the root path of the application.

It means that the filename argument will take a relative path to your file in static_folder and convert it to a relative path combined with static_url_default:

url_for('static', filename='path/to/file')

will convert the file path from static_folder/path/to/file to the url path static_url_default/path/to/file.

So if you want to get files from the static/bootstrap folder you use this code:

<link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='bootstrap/bootstrap.min.css') }}">

Which will be converted to (using default settings):

<link rel="stylesheet" type="text/css" href="static/bootstrap/bootstrap.min.css">

Also look at url_for documentation.

How to read AppSettings values from a .json file in ASP.NET Core

I doubt this is good practice but it's working locally. I'll update this if it fails when I publish/deploy (to an IIS web service).

Step 1 - Add this assembly to the top of your class (in my case, controller class):

using Microsoft.Extensions.Configuration;

Step 2 - Add this or something like it:

var config = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json").Build();

Step 3 - Call your key's value by doing this (returns string):

config["NameOfYourKey"]

iPhone/iPad browser simulator?

For now i think best emulator is https://app.crossbrowsertesting.com

It has real sizes and virtual keyboard (that is the most important thing) , zooming events...

Also https://appetize.io/demo has same things but it has time limit.

Find a file by name in Visual Studio Code

It's Ctrl+Shift+O / Cmd+Shift+O on mac. You can see it if you close all tabs

How do you extract classes' source code from a dll file?

Use dotPeek

Select the .dll to decompile

That's it

Install gitk on Mac

If, like me, you have SourceTree installed, but want to use gitk as well, you can use the version that comes with SourceTree's embedded version of git.

SourceTree's version of git (and thus gitk) is here:

For Windows:

C:\Users\User\AppData\Local\Atlassian\SourceTree\git_local\bin\git.exe

or

%USERPROFILE%\AppData\Local\Atlassian\SourceTree\git_local\bin

For Mac:

/Applications/SourceTree.app/Contents/Resources/git_local/bin

In that directory, you'll find a gitk executable.

Thanks to @Adrian for the comment which alerted me to this. I thought it was worth posting as an answer in its own right.

Java Process with Input/Output Stream

You have writer.close(); in your code. So bash receives EOF on its stdin and exits. Then you get Broken pipe when trying to read from the stdoutof the defunct bash.

What does getActivity() mean?

I to had a similar doubt what I got to know was getActivity() returns the Activity to which the fragment is associated.

The getActivity() method is used generally in static fragment as the associated activity will not be static and non static member cannot be used in static member.

I used <code>getActivity()</code> here to get non-static activity to which the the placeholder fragment is associated.

How to deal with bad_alloc in C++?

You can catch it like any other exception:

try {
  foo();
}
catch (const std::bad_alloc&) {
  return -1;
}

Quite what you can usefully do from this point is up to you, but it's definitely feasible technically.

In general you cannot, and should not try, to respond to this error. bad_alloc indicates that a resource cannot be allocated because not enough memory is available. In most scenarios your program cannot hope to cope with that, and terminating soon is the only meaningful behaviour.

Worse, modern operating systems often over-allocate: on such systems, malloc and new can return a valid pointer even if there is not enough free memory left – std::bad_alloc will never be thrown, or is at least not a reliable sign of memory exhaustion. Instead, attempts to access the allocated memory will then result in a segmentation fault, which is not catchable (you can handle the segmentation fault signal, but you cannot resume the program afterwards).

The only thing you could do when catching std::bad_alloc is to perhaps log the error, and try to ensure a safe program termination by freeing outstanding resources (but this is done automatically in the normal course of stack unwinding after the error gets thrown if the program uses RAII appropriately).

In certain cases, the program may attempt to free some memory and try again, or use secondary memory (= disk) instead of RAM but these opportunities only exist in very specific scenarios with strict conditions:

The application must ensure that it runs on a system that does not overcommit memory, i.e. it signals failure upon allocation rather than later.
The application must be able to free memory immediately, without any further accidental allocations in the meantime.

It’s exceedingly rare that applications have control over point 1 — userspace applications never do, it’s a system-wide setting that requires root permissions to change.¹

OK, so let’s assume you’ve fixed point 1. What you can now do is for instance use a LRU cache for some of your data (probably some particularly large business objects that can be regenerated or reloaded on demand). Next, you need to put the actual logic that may fail into a function that supports retry — in other words, if it gets aborted, you can just relaunch it:

lru_cache<widget> widget_cache;

double perform_operation(int widget_id) {
    std::optional<widget> maybe_widget = widget_cache.find_by_id(widget_id);
    if (not maybe_widget) {
        maybe_widget = widget_cache.store(widget_id, load_widget_from_disk(widget_id));
    }
    return maybe_widget->frobnicate();
}

…

for (int num_attempts = 0; num_attempts < MAX_NUM_ATTEMPTS; ++num_attempts) {
    try {
        return perform_operation(widget_id);
    } catch (std::bad_alloc const&) {
        if (widget_cache.empty()) throw; // memory error elsewhere.
        widget_cache.remove_oldest();
    }
}

// Handle too many failed attempts here.

But even here, using std::set_new_handler instead of handling std::bad_alloc provides the same benefit and would be much simpler.

¹ If you’re creating an application that does control point 1, and you’re reading this answer, please shoot me an email, I’m genuinely curious about your circumstances.

What is the C++ Standard specified behavior of `new` in c++?

The usual notion is that if new operator cannot allocate dynamic memory of the requested size, then it should throw an exception of type std::bad_alloc.
However, something more happens even before a bad_alloc exception is thrown:

C++03 Section 3.7.4.1.3: says

An allocation function that fails to allocate storage can invoke the currently installed new_handler(18.4.2.2), if any. [Note: A program-supplied allocation function can obtain the address of the currently installed new_handler using the set_new_handler function (18.4.2.3).] If an allocation function declared with an empty exception-specification (15.4), throw(), fails to allocate storage, it shall return a null pointer. Any other allocation function that fails to allocate storage shall only indicate failure by throw-ing an exception of class std::bad_alloc (18.4.2.1) or a class derived from std::bad_alloc.

Consider the following code sample:

#include <iostream>
#include <cstdlib>

// function to call if operator new can't allocate enough memory or error arises
void outOfMemHandler()
{
    std::cerr << "Unable to satisfy request for memory\n";

    std::abort();
}

int main()
{
    //set the new_handler
    std::set_new_handler(outOfMemHandler);

    //Request huge memory size, that will cause ::operator new to fail
    int *pBigDataArray = new int[100000000L];

    return 0;
}

In the above example, operator new (most likely) will be unable to allocate space for 100,000,000 integers, and the function outOfMemHandler() will be called, and the program will abort after issuing an error message.

As seen here the default behavior of new operator when unable to fulfill a memory request, is to call the new-handler function repeatedly until it can find enough memory or there is no more new handlers. In the above example, unless we call std::abort(), outOfMemHandler() would be called repeatedly. Therefore, the handler should either ensure that the next allocation succeeds, or register another handler, or register no handler, or not return (i.e. terminate the program). If there is no new handler and the allocation fails, the operator will throw an exception.

What is the `new_handler` and `set_new_handler`?

new_handler is a typedef for a pointer to a function that takes and returns nothing, and set_new_handler is a function that takes and returns a new_handler.

Something like:

typedef void (*new_handler)();
new_handler set_new_handler(new_handler p) throw();

set_new_handler's parameter is a pointer to the function operator new should call if it can't allocate the requested memory. Its return value is a pointer to the previously registered handler function, or null if there was no previous handler.

How to handle out of memory conditions in C++?

Given the behavior of newa well designed user program should handle out of memory conditions by providing a proper new_handlerwhich does one of the following:

Make more memory available: This may allow the next memory allocation attempt inside operator new's loop to succeed. One way to implement this is to allocate a large block of memory at program start-up, then release it for use in the program the first time the new-handler is invoked.

Install a different new-handler: If the current new-handler can't make any more memory available, and of there is another new-handler that can, then the current new-handler can install the other new-handler in its place (by calling set_new_handler). The next time operator new calls the new-handler function, it will get the one most recently installed.

(A variation on this theme is for a new-handler to modify its own behavior, so the next time it's invoked, it does something different. One way to achieve this is to have the new-handler modify static, namespace-specific, or global data that affects the new-handler's behavior.)

Uninstall the new-handler: This is done by passing a null pointer to set_new_handler. With no new-handler installed, operator new will throw an exception ((convertible to) std::bad_alloc) when memory allocation is unsuccessful.

Throw an exception convertible to std::bad_alloc. Such exceptions are not be caught by operator new, but will propagate to the site originating the request for memory.

Not return: By calling abort or exit.

What is the list of valid @SuppressWarnings warning names in Java?

If you're using SonarLint, try above the method or class the whole squid string: @SuppressWarnings("squid:S1172")

blur vs focusout -- any real differences?

The documentation for focusout says (emphasis mine):

The focusout event is sent to an element when it, or any element inside of it, loses focus. This is distinct from the blur event in that it supports detecting the loss of focus on descendant elements (in other words, it supports event bubbling).

The same distinction exists between the focusin and focus events.

Gradle to execute Java class (without modifying build.gradle)

There is no direct equivalent to mvn exec:java in gradle, you need to either apply the application plugin or have a JavaExec task.

`application` plugin

Activate the plugin:

plugins {
    id 'application'
    ...
}

Configure it as follows:

application {
    mainClassName = project.hasProperty("mainClass") ? getProperty("mainClass") : "NULL"
}

On the command line, write

$ gradle -PmainClass=Boo run

`JavaExec` task

Define a task, let's say execute:

task execute(type:JavaExec) {
   main = project.hasProperty("mainClass") ? getProperty("mainClass") : "NULL"
   classpath = sourceSets.main.runtimeClasspath
}

To run, write gradle -PmainClass=Boo execute. You get

$ gradle -PmainClass=Boo execute
:compileJava
:compileGroovy UP-TO-DATE
:processResources UP-TO-DATE
:classes
:execute
I am BOO!

mainClass is a property passed in dynamically at command line. classpath is set to pickup the latest classes.

If you do not pass in the mainClass property, both of the approaches fail as expected.

$ gradle execute

FAILURE: Build failed with an exception.

* Where:
Build file 'xxxx/build.gradle' line: 4

* What went wrong:
A problem occurred evaluating root project 'Foo'.
> Could not find property 'mainClass' on task ':execute'.

'ng' is not recognized as an internal or external command, operable program or batch file

I have tried with this below Steps and its working fine:-

Download latest version for nodejs, it should work

how to concatenate two dictionaries to create a new one in Python?

Here's a one-liner (imports don't count :) that can easily be generalized to concatenate N dictionaries:

Python 3

from itertools import chain
dict(chain.from_iterable(d.items() for d in (d1, d2, d3)))

and:

from itertools import chain
def dict_union(*args):
    return dict(chain.from_iterable(d.items() for d in args))

Python 2.6 & 2.7

from itertools import chain
dict(chain.from_iterable(d.iteritems() for d in (d1, d2, d3))

Output:

>>> from itertools import chain
>>> d1={1:2,3:4}
>>> d2={5:6,7:9}
>>> d3={10:8,13:22}
>>> dict(chain.from_iterable(d.iteritems() for d in (d1, d2, d3)))
{1: 2, 3: 4, 5: 6, 7: 9, 10: 8, 13: 22}

Generalized to concatenate N dicts:

from itertools import chain
def dict_union(*args):
    return dict(chain.from_iterable(d.iteritems() for d in args))

I'm a little late to this party, I know, but I hope this helps someone.

Understanding get and set and Python descriptors

The descriptor is how Python's property type is implemented. A descriptor simply implements __get__, __set__, etc. and is then added to another class in its definition (as you did above with the Temperature class). For example:

temp=Temperature()
temp.celsius #calls celsius.__get__

Accessing the property you assigned the descriptor to (celsius in the above example) calls the appropriate descriptor method.

instance in __get__ is the instance of the class (so above, __get__ would receive temp, while owner is the class with the descriptor (so it would be Temperature).

You need to use a descriptor class to encapsulate the logic that powers it. That way, if the descriptor is used to cache some expensive operation (for example), it could store the value on itself and not its class.

An article about descriptors can be found here.

EDIT: As jchl pointed out in the comments, if you simply try Temperature.celsius, instance will be None.

How to reduce the space between <p> tags?

I'll suggest to set padding and margin to 0.

If this does not solve your problem you can try playing with line-height even if not reccomended.

bypass invalid SSL certificate in .net core

Came here looking for an answer to the same problem, but I'm using WCF for NET Core. If you're in the same boat, use:

client.ClientCredentials.ServiceCertificate.SslCertificateAuthentication = 
    new X509ServiceCertificateAuthentication()
    {
        CertificateValidationMode = X509CertificateValidationMode.None,
        RevocationMode = X509RevocationMode.NoCheck
    };

ios app maximum memory budget

Results of testing with the utility Split wrote (link is in his answer):

device: (crash amount/total amount/percentage of total)

iPad1: 127MB/256MB/49%
iPad2: 275MB/512MB/53%
iPad3: 645MB/1024MB/62%
iPad4: 585MB/1024MB/57% (iOS 8.1)
iPad Mini 1st Generation: 297MB/512MB/58%
iPad Mini retina: 696MB/1024MB/68% (iOS 7.1)
iPad Air: 697MB/1024MB/68%
iPad Air 2: 1383MB/2048MB/68% (iOS 10.2.1)
iPad Pro 9.7": 1395MB/1971MB/71% (iOS 10.0.2 (14A456))
iPad Pro 10.5”: 3057/4000/76% (iOS 11 beta4)
iPad Pro 12.9” (2015): 3058/3999/76% (iOS 11.2.1)
iPad Pro 12.9” (2017): 3057/3974/77% (iOS 11 beta4)
iPad Pro 11.0” (2018): 2858/3769/76% (iOS 12.1)
iPad Pro 12.9” (2018, 1TB): 4598/5650/81% (iOS 12.1)
iPad 10.2: 1844/2998/62% (iOS 13.2.3)
iPod touch 4th gen: 130MB/256MB/51% (iOS 6.1.1)
iPod touch 5th gen: 286MB/512MB/56% (iOS 7.0)
iPhone4: 325MB/512MB/63%
iPhone4s: 286MB/512MB/56%
iPhone5: 645MB/1024MB/62%
iPhone5s: 646MB/1024MB/63%
iPhone6: 645MB/1024MB/62% (iOS 8.x)
iPhone6+: 645MB/1024MB/62% (iOS 8.x)
iPhone6s: 1396MB/2048MB/68% (iOS 9.2)
iPhone6s+: 1392MB/2048MB/68% (iOS 10.2.1)
iPhoneSE: 1395MB/2048MB/69% (iOS 9.3)
iPhone7: 1395/2048MB/68% (iOS 10.2)
iPhone7+: 2040MB/3072MB/66% (iOS 10.2.1)
iPhone8: 1364/1990MB/70% (iOS 12.1)
iPhone X: 1392/2785/50% (iOS 11.2.1)
iPhone XS: 2040/3754/54% (iOS 12.1)
iPhone XS Max: 2039/3735/55% (iOS 12.1)
iPhone XR: 1792/2813/63% (iOS 12.1)
iPhone 11: 2068/3844/54% (iOS 13.1.3)
iPhone 11 Pro Max: 2067/3740/55% (iOS 13.2.3)

How to recover stashed uncommitted changes

To check your stash content :-

git stash list

apply a particular stash no from stash list:-

git stash apply stash@{2}

or for applying just the first stash:-

git stash pop

Note: git stash pop will remove the stash from your stash list whereas git stash apply wont. So use them accordingly.

How do you upload a file to a document library in sharepoint?

With SharePoint 2013 new library, I managed to do something like this:

private void UploadToSharePoint(string p, out string newUrl)  //p is path to file to load
{
    string siteUrl = "https://myCompany.sharepoint.com/site/";
    //Insert Credentials
    ClientContext context = new ClientContext(siteUrl);

    SecureString passWord = new SecureString();
    foreach (var c in "mypassword") passWord.AppendChar(c);
    context.Credentials = new SharePointOnlineCredentials("myUserName", passWord);
    Web site = context.Web;

    //Get the required RootFolder
    string barRootFolderRelativeUrl = "Shared Documents/foo/bar";
    Folder barFolder = site.GetFolderByServerRelativeUrl(barRootFolderRelativeUrl);

    //Create new subFolder to load files into
    string newFolderName = baseName + DateTime.Now.ToString("yyyyMMddHHmm");
    barFolder.Folders.Add(newFolderName);
    barFolder.Update();

    //Add file to new Folder
    Folder currentRunFolder = site.GetFolderByServerRelativeUrl(barRootFolderRelativeUrl + "/" + newFolderName);
    FileCreationInformation newFile = new FileCreationInformation { Content = System.IO.File.ReadAllBytes(@p), Url = Path.GetFileName(@p), Overwrite = true };
    currentRunFolder.Files.Add(newFile);
    currentRunFolder.Update();

    context.ExecuteQuery();

    //Return the URL of the new uploaded file
    newUrl = siteUrl + barRootFolderRelativeUrl + "/" + newFolderName + "/" + Path.GetFileName(@p);
}

Java FileWriter how to write to next Line

.newLine() is the best if your system property line.separator is proper . and sometime you don't want to change the property runtime . So alternative solution is appending \n

How to implement the ReLU function in Numpy

If we have 3 parameters (t0, a0, a1) for Relu, that is we want to implement

if x > t0:
    x = x * a1
else:
    x = x * a0

We can use the following code:

X = X * (X > t0) * a1 +  X * (X < t0) * a0

X there is a matrix.

Perform Button click event when user press Enter key in Textbox

use Jquery or something here is example

of it http://riderdesign.com/articles/Check-username-availability-with-JQuery-and-ASP.NET.aspx i hope i will help you more

How to get the latest file in a folder?

max(files, key = os.path.getctime)

is quite incomplete code. What is files? It probably is a list of file names, coming out of os.listdir().

But this list lists only the filename parts (a. k. a. "basenames"), because their path is common. In order to use it correctly, you have to combine it with the path leading to it (and used to obtain it).

Such as (untested):

def newest(path):
    files = os.listdir(path)
    paths = [os.path.join(path, basename) for basename in files]
    return max(paths, key=os.path.getctime)

Read a Csv file with powershell and capture corresponding data

Old topic, but never clearly answered. I've been working on similar as well, and found the solution:

The pipe (|) in this code sample from Austin isn't the delimiter, but to pipe the ForEach-Object, so if you want to use it as delimiter, you need to do this:

Import-Csv H:\Programs\scripts\SomeText.csv -delimiter "|" |`
ForEach-Object {
    $Name += $_.Name
    $Phone += $_."Phone Number"
}

Spent a good 15 minutes on this myself before I understood what was going on. Hope the answer helps the next person reading this avoid the wasted minutes! (Sorry for expanding on your comment Austin)

How to convert std::string to lower case?

I tried std::transform, all i get is abominable stl criptic compilation error that only druids from 200 years ago can understand (cannot convert from to flibidi flabidi flu)

this works fine and can be easily tweaked

string LowerCase(string s)
{
    int dif='a'-'A';
    for(int i=0;i<s.length();i++)
    {
        if((s[i]>='A')&&(s[i]<='Z'))
            s[i]+=dif;
    }
   return s;
}

string UpperCase(string s)
{
   int dif='a'-'A';
    for(int i=0;i<s.length();i++)
    {
        if((s[i]>='a')&&(s[i]<='z'))
            s[i]-=dif;
    }
   return s;
}

Python group by

result = []
# Make a set of your "types":
input_set = set([tpl[1] for tpl in input])
>>> set(['ETH', 'KAT', 'NOT'])
# Iterate over the input_set
for type_ in input_set:
    # a dict to gather things:
    D = {}
    # filter all tuples from your input with the same type as type_
    tuples = filter(lambda tpl: tpl[1] == type_, input)
    # write them in the D:
    D["type"] = type_
    D["itmes"] = [tpl[0] for tpl in tuples]
    # append D to results:
    result.append(D)

result
>>> [{'itmes': ['9085267', '11788544'], 'type': 'NOT'}, {'itmes': ['5238761', '5349618', '962142', '7795297', '7341464', '5594916', '1550003'], 'type': 'ETH'}, {'itmes': ['11013331', '9843236'], 'type': 'KAT'}]

How to display length of filtered ng-repeat data

For Angular 1.3+ (credits to @Tom)

Use an alias expression (Docs: Angular 1.3.0: ngRepeat, scroll down to the Arguments section):

<div ng-repeat="person in data | filter:query as filtered">
</div>

For Angular prior to 1.3

Assign the results to a new variable (e.g. filtered) and access it:

<div ng-repeat="person in filtered = (data | filter: query)">
</div>

Display the number of results:

Showing {{filtered.length}} Persons

Fiddle a similar example. Credits go to Pawel Kozlowski

Which programming languages can be used to develop in Android?

I made good experiences with Scala.

I use the simple build tool (sbt: http://code.google.com/p/simple-build-tool/) with the Android-Plugin (http://github.com/jberkel/android-plugin)

Python: Pandas pd.read_excel giving ImportError: Install xlrd >= 0.9.0 for Excel support

I encountered same problem and took 2 hours to figure it out.

pip install xlrd (latest)
pip install pandas (latest)
Go to C:\Python27\Lib\site-packages and check for xlrd folder (if there are 2 of them) delete the old version
open a new terminal and use pandas to read excel. It should work.

Setting a div's height in HTML with CSS

Give this a try:

_x000D_

html, body,_x000D_
#left, #right {_x000D_
  height: 100%_x000D_
}_x000D_
_x000D_
#left {_x000D_
  float: left;_x000D_
  width: 25%;_x000D_
}_x000D_
#right {_x000D_
  width: 75%;_x000D_
}

_x000D_

<html>_x000D_
  <body>_x000D_
    <div id="left">_x000D_
      Content_x000D_
    </div>_x000D_
    <div id="right">_x000D_
      Content_x000D_
    </div>_x000D_
  </body>_x000D_
</html>

_x000D_

Keyboard shortcut for Jump to Previous View Location (Navigate back/forward) in IntelliJ IDEA

Mostly the default shortcut key combination is Ctrl + Alt + Left/Right. (I'm using the linux version)

Or you can have a toolbar option for it. Enable the tool bar by View -> Toolbar. The Left and Right Arrows will do the same. If you hover over it then you can see the shortcut key combination also.

Just in case the key combination is not working (this can be due to several reasons like you are using a virtual machine, etc) you can change this default key combination, or you can add an extra combination (ex: For Back/Move to previous Ctrl + Alt + < or Comma).

Go to Settings -> select keymap (type keymap in the search bar) -> **Editor Actions -> search for back and find Navigate options -> change the settings as you prefer.

Why does "npm install" rewrite package-lock.json?

Update 3: As other answers point out as well, the npm ci command got introduced in npm 5.7.0 as additional way to achieve fast and reproducible builds in the CI context. See the documentation and npm blog for further information.

Update 2: The issue to update and clarify the documentation is GitHub issue #18103.

Update 1: The behaviour that was described below got fixed in npm 5.4.2: the currently intended behaviour is outlined in GitHub issue #17979.

Original answer: The behaviour of package-lock.json was changed in npm 5.1.0 as discussed in issue #16866. The behaviour that you observe is apparently intended by npm as of version 5.1.0.

That means that package.json can override package-lock.json whenever a newer version is found for a dependency in package.json. If you want to pin your dependencies effectively, you now must specify the versions without a prefix, e.g., you need to write them as 1.2.0 instead of ~1.2.0 or ^1.2.0. Then the combination of package.json and package-lock.json will yield reproducible builds. To be clear: package-lock.json alone no longer locks the root level dependencies!

Whether this design decision was good or not is arguable, there is an ongoing discussion resulting from this confusion on GitHub in issue #17979. (In my eyes it is a questionable decision; at least the name lock doesn't hold true any longer.)

One more side note: there is also a restriction for registries that don’t support immutable packages, such as when you pull packages directly from GitHub instead of npmjs.org. See this documentation of package locks for further explanation.

How to return a 200 HTTP Status Code from ASP.NET MVC 3 controller

The way to do this in .NET Core is (at the time of writing) as follows:

public async Task<IActionResult> YourAction(YourModel model)
{
    if (ModelState.IsValid)
    {
        return StatusCode(200);
    }

    return StatusCode(400);
}

The StatusCode method returns a type of StatusCodeResult which implements IActionResult and can thus be used as a return type of your action.

As a refactor, you could improve readability by using a cast of the HTTP status codes enum like:

return StatusCode((int)HttpStatusCode.OK);

Furthermore, you could also use some of the built in result types. For example:

return Ok(); // returns a 200
return BadRequest(ModelState); // returns a 400 with the ModelState as JSON

Ref. StatusCodeResult - https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.mvc.statuscoderesult?view=aspnetcore-2.1

Android Studio Gradle project "Unable to start the daemon process /initialization of VM"

It has to do with how much memory is available for AS to create a VM environment for your app to populate. The thing is that ever since the update to 2.2 I've had the same problem every time I try to create a new project in AS.

How I solve it is by going into Project (on the left hand side) > Gradle Scripts > gradle.properties. When it opens the file go to the line under "(Line 10)# Specifies the JVM arguments used for the daemon process. (Line 11)# The setting is particularly useful for tweaking memory settings." You're looking for the line that starts with "org.gradle.jvmargs". This should be line 12. Change line 12 to this

org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8

After changing this line you can either sync the gradle with the project by clicking Try again on the notification telling you the gradle sync failed (it'll be at the top of the file you opened). Or you can simply close and restart the AS and it should sync.

Essentially what this is saying is for AS to allocate more memory to the app initialization. I know it's not a permanent fix but it should get you through actually starting your app.

Bundle ID Suffix? What is it?

The bundle identifier is an ID for your application used by the system as a domain for which it can store settings and reference your application uniquely.

It is represented in reverse DNS notation and it is recommended that you use your company name and application name to create it.

An example bundle ID for an App called The Best App by a company called Awesome Apps would look like:

com.awesomeapps.thebestapp

In this case the suffix is thebestapp.

How to avoid variable substitution in Oracle SQL Developer with 'trinidad & tobago'

set scan off; Above command also works.

How to use Google fonts in React.js?

you should see this tutorial: https://scotch.io/@micwanyoike/how-to-add-fonts-to-a-react-project

import WebFont from 'webfontloader';

WebFont.load({
  google: {
    families: ['Titillium Web:300,400,700', 'sans-serif']
  }
});

I just tried this method and I can say that it works very well ;)

How to git-cherry-pick only changes to certain files?

Use git merge --squash branch_name this will get all changes from the other branch and will prepare a commit for you. Now remove all unneeded changes and leave the one you want. And git will not know that there was a merge.

java.net.UnknownHostException: Unable to resolve host "<url>": No address associated with hostname and End of input at character 0 of

I encountered this problem too, reconnecting the WiFi can solve this.

For us ,we can check if the phone can resolve the host to IP when we start application. If it cannot resolve, tell the user to check the WiFi and then exit.

I hope it helps.

Splitting on first occurrence

From the docs:

str.split([sep[, maxsplit]])

Return a list of the words in the string, using sep as the delimiter string. If maxsplit is given, at most maxsplit splits are done (thus, the list will have at most maxsplit+1 elements).

s.split('mango', 1)[1]

How to close the command line window after running a batch file?

If you only need to execute only one command all by itself and no wait needed, you should try "cmd /c", this works for me!

cmd /c start iexplore "http://your/url.html"

cmd /c means executing a command and then exit.

You can learn the functions of your switches by typing in your command prompt

anycmd /?

Set Text property of asp:label in Javascript PROPER way

Asp.net codebehind runs on server first and then page is rendered to client (browser). Codebehind has no access to client side (javascript, html) because it lives on server only.

So, either use ajax and sent value of label to code behind. You can use PageMethods , or simply post the page to server where codebehind lives, so codebehind can know the updated value :)

How to set an image as a background for Frame in Swing GUI of java?

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class BackgroundImageJFrame extends JFrame
{
  JButton b1;
  JLabel l1;
public BackgroundImageJFrame()
{
setTitle("Background Color for JFrame");
setSize(400,400);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
/*
 One way
-----------------*/
setLayout(new BorderLayout());
JLabel background=new JLabel(new ImageIcon("C:\\Users\\Computer\\Downloads\\colorful design.png"));
add(background);
background.setLayout(new FlowLayout());
l1=new JLabel("Here is a button");
b1=new JButton("I am a button");
background.add(l1);
background.add(b1);

// Another way
setLayout(new BorderLayout());
setContentPane(new JLabel(new ImageIcon("C:\\Users\\Computer\\Downloads  \\colorful design.png")));
setLayout(new FlowLayout());
l1=new JLabel("Here is a button");
b1=new JButton("I am a button");
add(l1);
add(b1);
// Just for refresh :) Not optional!
  setSize(399,399);
   setSize(400,400);
   }
   public static void main(String args[])
  {
   new BackgroundImageJFrame();
 }
 }

bower automatically update bower.json

from bower help, save option has a capital S

-S, --save  Save installed packages into the project's bower.json dependencies

Path to Powershell.exe (v 2.0)

I believe it's in C:\Windows\System32\WindowsPowershell\v1.0\. In order to confuse the innocent, MS kept it in a directory labeled "v1.0". Running this on Windows 7 and checking the version number via $Host.Version (Determine installed PowerShell version) shows it's 2.0.

Another option is type $PSVersionTable at the command prompt. If you are running v2.0, the output will be:

Name                           Value
----                           -----
CLRVersion                     2.0.50727.4927
BuildVersion                   6.1.7600.16385
PSVersion                      2.0
WSManStackVersion              2.0
PSCompatibleVersions           {1.0, 2.0}
SerializationVersion           1.1.0.1
PSRemotingProtocolVersion      2.1

If you're running version 1.0, the variable doesn't exist and there will be no output.

Localization PowerShell version 1.0, 2.0, 3.0, 4.0:

64 bits version: C:\Windows\System32\WindowsPowerShell\v1.0\
32 bits version: C:\Windows\SysWOW64\WindowsPowerShell\v1.0\

Python speed testing - Time Difference - milliseconds

I know this is late, but I actually really like using:

import time
start = time.time()

##### your timed code here ... #####

print "Process time: " + (time.time() - start)

time.time() gives you seconds since the epoch. Because this is a standardized time in seconds, you can simply subtract the start time from the end time to get the process time (in seconds). time.clock() is good for benchmarking, but I have found it kind of useless if you want to know how long your process took. For example, it's much more intuitive to say "my process takes 10 seconds" than it is to say "my process takes 10 processor clock units"

>>> start = time.time(); sum([each**8.3 for each in range(1,100000)]) ; print (time.time() - start)
3.4001404476250935e+45
0.0637760162354
>>> start = time.clock(); sum([each**8.3 for each in range(1,100000)]) ; print (time.clock() - start)
3.4001404476250935e+45
0.05

In the first example above, you are shown a time of 0.05 for time.clock() vs 0.06377 for time.time()

>>> start = time.clock(); time.sleep(1) ; print "process time: " + (time.clock() - start)
process time: 0.0
>>> start = time.time(); time.sleep(1) ; print "process time: " + (time.time() - start)
process time: 1.00111794472

In the second example, somehow the processor time shows "0" even though the process slept for a second. time.time() correctly shows a little more than 1 second.

Using jQuery Fancybox or Lightbox to display a contact form

you'll probably want to look into jquery-ui dialog. it's highly customizable and can be made to work exactly like lightbox/fancybox and supports everything you would need for a contact form from a regular link.

there is even an example with a form.

How can I post data as form data instead of a request payload?

var fd = new FormData();
    fd.append('file', file);
    $http.post(uploadUrl, fd, {
        transformRequest: angular.identity,
        headers: {'Content-Type': undefined}
    })
    .success(function(){
    })
    .error(function(){
    });

Please checkout! https://uncorkedstudios.com/blog/multipartformdata-file-upload-with-angularjs

Remove DEFINER clause from MySQL Dumps

I don't think there is a way to ignore adding DEFINERs to the dump. But there are ways to remove them after the dump file is created.

Open the dump file in a text editor and replace all occurrences of DEFINER=root@localhost with an empty string ""

Edit the dump (or pipe the output) using perl:

perl -p -i.bak -e "s/DEFINER=\`\w.*\`@\`\d[0-3].*[0-3]\`//g" mydatabase.sql

Pipe the output through sed:

mysqldump ... | sed -e 's/DEFINER[ ]*=[ ]*[^*]*\*/\*/' > triggers_backup.sql

How to set a single, main title above all the subplots with Pyplot?

A few points I find useful when applying this to my own plots:

I prefer the consistency of using fig.suptitle(title) rather than plt.suptitle(title)
When using fig.tight_layout() the title must be shifted with fig.subplots_adjust(top=0.88)
See answer below about fontsizes

Example code taken from subplots demo in matplotlib docs and adjusted with a master title.

import matplotlib.pyplot as plt
import numpy as np

# Simple data to display in various forms
x = np.linspace(0, 2 * np.pi, 400)
y = np.sin(x ** 2)

fig, axarr = plt.subplots(2, 2)
fig.suptitle("This Main Title is Nicely Formatted", fontsize=16)

axarr[0, 0].plot(x, y)
axarr[0, 0].set_title('Axis [0,0] Subtitle')
axarr[0, 1].scatter(x, y)
axarr[0, 1].set_title('Axis [0,1] Subtitle')
axarr[1, 0].plot(x, y ** 2)
axarr[1, 0].set_title('Axis [1,0] Subtitle')
axarr[1, 1].scatter(x, y ** 2)
axarr[1, 1].set_title('Axis [1,1] Subtitle')

# # Fine-tune figure; hide x ticks for top plots and y ticks for right plots
plt.setp([a.get_xticklabels() for a in axarr[0, :]], visible=False)
plt.setp([a.get_yticklabels() for a in axarr[:, 1]], visible=False)

# Tight layout often produces nice results
# but requires the title to be spaced accordingly
fig.tight_layout()
fig.subplots_adjust(top=0.88)

plt.show()

Best way to get hostname with php

For PHP >= 5.3.0 use this:

$hostname = gethostname();

For PHP < 5.3.0 but >= 4.2.0 use this:

$hostname = php_uname('n');

For PHP < 4.2.0 use this:

$hostname = getenv('HOSTNAME'); 
if(!$hostname) $hostname = trim(`hostname`); 
if(!$hostname) $hostname = exec('echo $HOSTNAME');
if(!$hostname) $hostname = preg_replace('#^\w+\s+(\w+).*$#', '$1', exec('uname -a'));

Find an item in List by LINQ?

Here is one way to rewrite your method to use LINQ:

public static int GetItemIndex(string search)
{
    List<string> _list = new List<string>() { "one", "two", "three" };

    var result = _list.Select((Value, Index) => new { Value, Index })
            .SingleOrDefault(l => l.Value == search);

    return result == null ? -1 : result.Index;
}

Thus, calling it with

GetItemIndex("two") will return 1,

and

GetItemIndex("notthere") will return -1.

Reference: linqsamples.com

What is the default value for Guid?

You can use Guid.Empty. It is a read-only instance of the Guid structure with the value of 00000000-0000-0000-0000-000000000000

you can also use these instead

var g = new Guid();
var g = default(Guid);

beware not to use Guid.NewGuid() because it will generate a new Guid.

use one of the options above which you and your team think it is more readable and stick to it. Do not mix different options across the code. I think the Guid.Empty is the best one since new Guid() might make us think it is generating a new guid and some may not know what is the value of default(Guid).

How do I iterate through each element in an n-dimensional matrix in MATLAB?

these solutions are more faster (about 11%) than using numel;)

for idx = reshape(array,1,[]),
     element = element + idx;
end

for idx = array(:)',
    element = element + idx;
end

UPD. tnx @rayryeng for detected error in last answer

Disclaimer

The timing information that this post has referenced is incorrect and inaccurate due to a fundamental typo that was made (see comments stream below as well as the edit history - specifically look at the first version of this answer). Caveat Emptor.

jquery ui Dialog: cannot call methods on dialog prior to initialization

I got this error when I only updated the jquery library without updating the jqueryui library in parallel. I was using jquery 1.8.3 with jqueryui 1.9.0. However, when I updated jquery 1.8.3 to 1.9.1 I got the above error. When I commented out the offending .close method lines, it then threw an error about not finding .browser in the jquery library which was deprecated in jquery 1.8.3 and removed from jquery 1.9.1. So bascially, the jquery 1.9.1 library was not compatible with the jquery ui 1.9.0 library despite the jquery ui download page saying it works with jquery 1.6+. Essentially, there are unreported bugs when trying to use differing versions of the two. If you use the jquery version that comes bundled with the jqueryui download, I'm sure you'll be fine, but it's when you start using different versions that you off the beaten path and get errors like this. So, in summary, this error is from mis-matched versions (in my case anyway).

How to ignore deprecation warnings in Python

Convert the argument to int. It's as simple as

int(argument)

Write and read a list from file

If you don't need it to be human-readable/editable, the easiest solution is to just use pickle.

To write:

with open(the_filename, 'wb') as f:
    pickle.dump(my_list, f)

To read:

with open(the_filename, 'rb') as f:
    my_list = pickle.load(f)

If you do need them to be human-readable, we need more information.

If my_list is guaranteed to be a list of strings with no embedded newlines, just write them one per line:

with open(the_filename, 'w') as f:
    for s in my_list:
        f.write(s + '\n')

with open(the_filename, 'r') as f:
    my_list = [line.rstrip('\n') for line in f]

If they're Unicode strings rather than byte strings, you'll want to encode them. (Or, worse, if they're byte strings, but not necessarily in the same encoding as your system default.)

If they might have newlines, or non-printable characters, etc., you can use escaping or quoting. Python has a variety of different kinds of escaping built into the stdlib.

Let's use unicode-escape here to solve both of the above problems at once:

with open(the_filename, 'w') as f:
    for s in my_list:
        f.write((s + u'\n').encode('unicode-escape'))

with open(the_filename, 'r') as f:
    my_list = [line.decode('unicode-escape').rstrip(u'\n') for line in f]

You can also use the 3.x-style solution in 2.x, with either the codecs module or the io module:*

import io

with io.open(the_filename, 'w', encoding='unicode-escape') as f:
    f.writelines(line + u'\n' for line in my_list)

with open(the_filename, 'r') as f:
    my_list = [line.rstrip(u'\n') for line in f]

_{* TOOWTDI, so which is the one obvious way? It depends… For the short version: if you need to work with Python versions before 2.6, use codecs; if not, use io.}

Convert List(of object) to List(of string)

List<string> myList Str = myList.Select(x=>x.Value).OfType<string>().ToList();

Use "Select" to select a particular column

Optional Parameters in Web Api Attribute Routing

Converting my comment into an answer to complement @Kiran Chala's answer as it seems helpful for the audiences-

When we mark a parameter as optional in the action uri using ? character then we must provide default values to the parameters in the method signature as shown below:

MyMethod(string name = "someDefaultValue", int? Id = null)

What is the difference between Swing and AWT?

AWT 1 . AWT occupies more memory space 2 . AWT is platform dependent 3 . AWT require javax.awt package

swings 1 . Swing occupies less memory space 2 . Swing component is platform independent 3 . Swing requires javax.swing package

How do you query for "is not null" in Mongo?

An alternative that has not been mentioned, but that may be a more efficient option for some (won't work with NULL entries) is to use a sparse index (entries in the index only exist when there is something in the field). Here is a sample data set:

db.foo.find()
{ "_id" : ObjectId("544540b31b5cf91c4893eb94"), "imageUrl" : "http://example.com/foo.jpg" }
{ "_id" : ObjectId("544540ba1b5cf91c4893eb95"), "imageUrl" : "http://example.com/bar.jpg" }
{ "_id" : ObjectId("544540c51b5cf91c4893eb96"), "imageUrl" : "http://example.com/foo.png" }
{ "_id" : ObjectId("544540c91b5cf91c4893eb97"), "imageUrl" : "http://example.com/bar.png" }
{ "_id" : ObjectId("544540ed1b5cf91c4893eb98"), "otherField" : 1 }
{ "_id" : ObjectId("544540f11b5cf91c4893eb99"), "otherField" : 2 }

Now, create the sparse index on imageUrl field:

db.foo.ensureIndex( { "imageUrl": 1 }, { sparse: true } )
{
    "createdCollectionAutomatically" : false,
    "numIndexesBefore" : 1,
    "numIndexesAfter" : 2,
    "ok" : 1
}

Now, there is always a chance (and in particular with a small data set like my sample) that rather than using an index, MongoDB will use a table scan, even for a potential covered index query. As it turns out that gives me an easy way to illustrate the difference here:

db.foo.find({}, {_id : 0, imageUrl : 1})
{ "imageUrl" : "http://example.com/foo.jpg" }
{ "imageUrl" : "http://example.com/bar.jpg" }
{ "imageUrl" : "http://example.com/foo.png" }
{ "imageUrl" : "http://example.com/bar.png" }
{  }
{  }

OK, so the extra documents with no imageUrl are being returned, just empty, not what we wanted. Just to confirm why, do an explain:

db.foo.find({}, {_id : 0, imageUrl : 1}).explain()
{
    "cursor" : "BasicCursor",
    "isMultiKey" : false,
    "n" : 6,
    "nscannedObjects" : 6,
    "nscanned" : 6,
    "nscannedObjectsAllPlans" : 6,
    "nscannedAllPlans" : 6,
    "scanAndOrder" : false,
    "indexOnly" : false,
    "nYields" : 0,
    "nChunkSkips" : 0,
    "millis" : 0,
    "server" : "localhost:31100",
    "filterSet" : false
}

So, yes, a BasicCursor equals a table scan, it did not use the index. Let's force the query to use our sparse index with a hint():

db.foo.find({}, {_id : 0, imageUrl : 1}).hint({imageUrl : 1})
{ "imageUrl" : "http://example.com/bar.jpg" }
{ "imageUrl" : "http://example.com/bar.png" }
{ "imageUrl" : "http://example.com/foo.jpg" }
{ "imageUrl" : "http://example.com/foo.png" }

And there is the result we were looking for - only documents with the field populated are returned. This also only uses the index (i.e. it is a covered index query), so only the index needs to be in memory to return the results.

This is a specialized use case and can't be used generally (see other answers for those options). In particular it should be noted that as things stand you cannot use count() in this way (for my example it will return 6 not 4), so please only use when appropriate.

onchange event for html.dropdownlist

If you have a list view you can do this:

Define a select list:

@{
   var Acciones = new SelectList(new[]
   {
  new SelectListItem { Text = "Modificar", Value = 
   Url.Action("Edit", "Countries")},
  new SelectListItem { Text = "Detallar", Value = 
  Url.Action("Details", "Countries") },
  new SelectListItem { Text = "Eliminar", Value = 
  Url.Action("Delete", "Countries") },
 }, "Value", "Text");
}

Use the defined SelectList, creating a diferent id for each record (remember that id of each element must be unique in a view), and finally call a javascript function for onchange event (include parameters in example url and record key):
```
@Html.DropDownList("ddAcciones", Acciones, "Acciones", new { id = 
item.CountryID, @onchange = "RealizarAccion(this.value ,id)" })
```

onchange function can be something as:

@section Scripts {
<script src="~/Scripts/jquery-1.10.2.min.js"></script>
<script src="~/Scripts/jquery.unobtrusive-ajax.js"></script>

<script type="text/javascript">

function RealizarAccion(accion, country)
{

    var url = accion + '/' + country;
    if (url != null && url != '') {
        window.location.href = url ;
    }
}
</script>

@Scripts.Render("~/bundles/jqueryval")
}

decimal vs double! - Which one should I use and when?

I think that the main difference beside bit width is that decimal has exponent base 10 and double has 2

http://software-product-development.blogspot.com/2008/07/net-double-vs-decimal.html

How to wrap text in LaTeX tables?

To change the text AB into A \r B in a table cell, put this into the cell position: \makecell{A \\ B}.

Before doing that, you also need to include package makecell.

.ps1 cannot be loaded because the execution of scripts is disabled on this system

There are certain scenarios in which you can follow the steps suggested in the other answers, verify that Execution Policy is set correctly, and still have your scripts fail. If this happens to you, you are probably on a 64-bit machine with both 32-bit and 64-bit versions of PowerShell, and the failure is happening on the version that doesn't have Execution Policy set. The setting does not apply to both versions, so you have to explicitly set it twice.

Look in your Windows directory for System32 and SysWOW64.

Repeat these steps for each directory:

Navigate to WindowsPowerShell\v1.0 and launch powershell.exe
Check the current setting for ExecutionPolicy:

Get-ExecutionPolicy -List
Set the ExecutionPolicy for the level and scope you want, for example:

Set-ExecutionPolicy -Scope LocalMachine Unrestricted

Note that you may need to run PowerShell as administrator depending on the scope you are trying to set the policy for.

You can read a lot more here: Running Windows PowerShell Scripts

Hive insert query like SQL

There are few properties to set to make a Hive table support ACID properties and to insert the values into tables as like in SQL .

Conditions to create a ACID table in Hive.

The table should be stored as ORC file. Only ORC format can support ACID prpoperties for now.
The table must be bucketed

Properties to set to create ACID table:

set hive.support.concurrency =true;
set hive.enforce.bucketing =true;
set hive.exec.dynamic.partition.mode =nonstrict
set hive.compactor.initiator.on = true;
set hive.compactor.worker.threads= 1;
set hive.txn.manager = org.apache.hadoop.hive.ql.lockmgr.DbTxnManager;

set the property hive.in.test to true in hive.site.xml

After setting all these properties , the table should be created with tblproperty 'transactional' ='true'. The table should be bucketed and saved as orc

CREATE TABLE table_name (col1 int,col2 string, col3 int) CLUSTERED BY col1 INTO 4 

BUCKETS STORED AS orc tblproperties('transactional' ='true');

Now its possible to inserte values into the table like SQL query.

INSERT INTO TABLE table_name VALUES (1,'a',100),(2,'b',200),(3,'c',300);

Pandas sum by groupby, but exclude certain columns

The agg function will do this for you. Pass the columns and function as a dict with column, output:

df.groupby(['Country', 'Item_Code']).agg({'Y1961': np.sum, 'Y1962': [np.sum, np.mean]})  # Added example for two output columns from a single input column

This will display only the group by columns, and the specified aggregate columns. In this example I included two agg functions applied to 'Y1962'.

To get exactly what you hoped to see, included the other columns in the group by, and apply sums to the Y variables in the frame:

df.groupby(['Code', 'Country', 'Item_Code', 'Item', 'Ele_Code', 'Unit']).agg({'Y1961': np.sum, 'Y1962': np.sum, 'Y1963': np.sum})

How do you use $sce.trustAsHtml(string) to replicate ng-bind-html-unsafe in Angular 1.2+

JavaScript

$scope.get_pre = function(x) {
    return $sce.trustAsHtml(x);
};

HTML

<pre ng-bind-html="get_pre(html)"></pre>

Where is the <conio.h> header file on Linux? Why can't I find <conio.h>?

conio.h is a C header file used in old MS-DOS compilers to create text user interfaces. Compilers that targeted non-DOS operating systems, such as Linux, Win32 and OS/2, provided different implementations of these functions.

The #include <curses.h> will give you almost all the functionalities that was provided in conio.h

nucurses need to be installed at the first place

In deb based Distros use

sudo apt-get install libncurses5-dev libncursesw5-dev

And in rpm based distros use

sudo yum install ncurses-devel ncurses

For getch() class of functions, you can try this

PowerShell and the -contains operator

like is best, or at least easiest.
match is used for regex comparisons.

Reference: https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_comparison_operators?view=powershell-6

Why is jquery's .ajax() method not sending my session cookie?

If you are developing on localhost or a port on localhost such as localhost:8080, in addition to the steps described in the answers above, you also need to ensure that you are not passing a domain value in the Set-Cookie header.
You cannot set the domain to localhost in the Set-Cookie header - that's incorrect - just omit the domain.

See Cookies on localhost with explicit domain and Why won't asp.net create cookies in localhost?

AngularJs: Reload page

Similar to Alexandrin's answer, but using $state rather than $route:

(From JimTheDev's SO answer here.)

$scope.reloadState = function() {
   $state.go($state.current, {}, {reload: true});
}

<a ng-click="reloadState()" ...

Change Spinner dropdown icon

dummy.xml(remember image size should be less)

<?xml version="1.0" encoding="utf-8"?>
    <selector xmlns:android="http://schemas.android.com/apk/res/android">
        <item>
            <layer-list android:opacity="transparent">
                <item android:width="60dp" android:gravity="left" android:start="20dp">
                    <bitmap  android:src="@drawable/down_button_dummy_dummy" android:gravity="left"/>
                </item>
            </layer-list>
        </item>
    </selector>

layout file snippet be like

<android.support.v7.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:cardUseCompatPadding="true"
        app:cardElevation="5dp"
        >
     <Spinner
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:background="@drawable/dummy">

     </Spinner>
    </android.support.v7.widget.CardView>

click to see result layout image

How do I fix the "You don't have write permissions into the /usr/bin directory" error when installing Rails?

You can use sudo gem install -n /usr/local/bin cocoapods

This works for me.

Border around tr element doesn't show?

Add this to the stylesheet:

table {
  border-collapse: collapse;
}

JSFiddle.

The reason why it behaves this way is actually described pretty well in the specification:

There are two distinct models for setting borders on table cells in CSS. One is most suitable for so-called separated borders around individual cells, the other is suitable for borders that are continuous from one end of the table to the other.

... and later, for collapse setting:

In the collapsing border model, it is possible to specify borders that surround all or part of a cell, row, row group, column, and column group.

Python display text with font & color?

You can use your own custom fonts by setting the font path using pygame.font.Font

pygame.font.Font(filename, size): return Font

example:

pygame.font.init()
font_path = "./fonts/newfont.ttf"
font_size = 32
fontObj = pygame.font.Font(font_path, font_size)

Then render the font using fontObj.render and blit to a surface as in veiset's answer above. :)

error 1265. Data truncated for column when trying to load data from txt file

I have met this problem with a column that has ENUM values('0','1').
When I was trying to save a new record, I was assigning value 0 for the ENUM variable.

For the solution: I have changed ENUM variable value from 0 to 1, and 1 to 2.

Using underscores in Java variables and method names

Here's a link to Sun's recommendations for Java. Not that you have to use these or even that their library code follows all of them, but it's a good start if you're going from scratch. Tool like Eclipse have built in formatters and cleanup tools that can help you conform to these conventions (or others that you define).

For me, '_' are too hard to type :)

How to multi-line "Replace in files..." in Notepad++

This is a subjective opinion, but I think a text editor shouldn't do everything and the kitchen sink. I prefer lightweight flexible and powerful (in their specialized fields) editors. Although being mostly a Windows user, I like the Unix philosophy of having lot of specialized tools that you can pipe together (like the UnxUtils) rather than a monster doing everything, but not necessarily as you would like it!

Find in files is on the border of these extra features, but useful when you can double-click on a found line to open the file at the right line. Note that initially, in SciTE it was just a Tools call to grep or equivalent!
FTP is very close to off topic, although it can be seen as an extended open/save dialog.
Replace in files is too much IMO: it is dangerous (you can mess lot of files at once) if you have no preview, etc. I would rather use a specialized tool I chose, perhaps among those in Multi line search and replace tool.

To answer the question, looking at N++, I see a Run menu where you can launch any tool, with assignment of a name and shortcut key. I see also Plugins > NppExec, which seems able to launch stuff like sed (not tried it).

How to put the legend out of the plot

Short answer: you can use bbox_to_anchor + bbox_extra_artists + bbox_inches='tight'.

Longer answer: You can use bbox_to_anchor to manually specify the location of the legend box, as some other people have pointed out in the answers.

However, the usual issue is that the legend box is cropped, e.g.:

import matplotlib.pyplot as plt

# data 
all_x = [10,20,30]
all_y = [[1,3], [1.5,2.9],[3,2]]

# Plot
fig = plt.figure(1)
ax = fig.add_subplot(111)
ax.plot(all_x, all_y)

# Add legend, title and axis labels
lgd = ax.legend( [ 'Lag ' + str(lag) for lag in all_x], loc='center right', bbox_to_anchor=(1.3, 0.5))
ax.set_title('Title')
ax.set_xlabel('x label')
ax.set_ylabel('y label')

fig.savefig('image_output.png', dpi=300, format='png')

enter image description here

In order to prevent the legend box from getting cropped, when you save the figure you can use the parameters bbox_extra_artists and bbox_inches to ask savefig to include cropped elements in the saved image:

fig.savefig('image_output.png', bbox_extra_artists=(lgd,), bbox_inches='tight')

Example (I only changed the last line to add 2 parameters to fig.savefig()):

import matplotlib.pyplot as plt

# data 
all_x = [10,20,30]
all_y = [[1,3], [1.5,2.9],[3,2]]

# Plot
fig = plt.figure(1)
ax = fig.add_subplot(111)
ax.plot(all_x, all_y)

# Add legend, title and axis labels
lgd = ax.legend( [ 'Lag ' + str(lag) for lag in all_x], loc='center right', bbox_to_anchor=(1.3, 0.5))
ax.set_title('Title')
ax.set_xlabel('x label')
ax.set_ylabel('y label')    

fig.savefig('image_output.png', dpi=300, format='png', bbox_extra_artists=(lgd,), bbox_inches='tight')

enter image description here

I wish that matplotlib would natively allow outside location for the legend box as Matlab does:

figure
x = 0:.2:12;
plot(x,besselj(1,x),x,besselj(2,x),x,besselj(3,x));
hleg = legend('First','Second','Third',...
              'Location','NorthEastOutside')
% Make the text of the legend italic and color it brown
set(hleg,'FontAngle','italic','TextColor',[.3,.2,.1])

enter image description here

Removing ul indentation with CSS

Remove this from #info:

    margin-left:auto;

Add this for your header:

#info p {
    text-align: center;
}

Do you need the fixed width etc.? I removed the in my opinion not necessary stuff and centered the header with text-align.

Sample
http://jsfiddle.net/Vc8CB/

MySQL Select all columns from one table and some from another table

Just use the table name:

SELECT myTable.*, otherTable.foo, otherTable.bar...

That would select all columns from myTable and columns foo and bar from otherTable.

Bootstrap with jQuery Validation Plugin

for total compatibility with twitter bootstrap 3, I need to override some plugins methods:

// override jquery validate plugin defaults
$.validator.setDefaults({
    highlight: function(element) {
        $(element).closest('.form-group').addClass('has-error');
    },
    unhighlight: function(element) {
        $(element).closest('.form-group').removeClass('has-error');
    },
    errorElement: 'span',
    errorClass: 'help-block',
    errorPlacement: function(error, element) {
        if(element.parent('.input-group').length) {
            error.insertAfter(element.parent());
        } else {
            error.insertAfter(element);
        }
    }
});

See Example: http://jsfiddle.net/mapb_1990/hTPY7/7/

What is the difference between range and xrange functions in Python 2.X?

What?
range returns a static list at runtime.
xrange returns an object (which acts like a generator, although it's certainly not one) from which values are generated as and when required.

When to use which?

Use xrange if you want to generate a list for a gigantic range, say 1 billion, especially when you have a "memory sensitive system" like a cell phone.
Use range if you want to iterate over the list several times.

PS: Python 3.x's range function == Python 2.x's xrange function.

Raise an error manually in T-SQL to jump to BEGIN CATCH block

THROW (Transact-SQL)

Raises an exception and transfers execution to a CATCH block of a TRY…CATCH construct in SQL Server 2017.

Please refer the below link

T-SQL Throw Exception

How to listen for a WebView finishing loading a URL?

The renderer will not finish rendering when the OnPageFinshed method is called or the progress reaches 100% so both methods don't guarantee you that the view was completely rendered.

But you can figure out from OnLoadResource method what has been already rendered and what is still rendering. And this method gets called several times.

        @Override
        public void onLoadResource(WebView view, String url) {
            super.onLoadResource(view, url);
           // Log and see all the urls and know exactly what is being rendered and visible. If you wanna know when the entire page is completely rendered, find the last url from log and check it with if clause and implement your logic there.
            if (url.contains("assets/loginpage/img/ui/forms/")) {
                // loginpage is rendered and visible now.
               // your logic here.

            }
        }

How to run multiple SQL commands in a single SQL connection?

Just enable this property in your connection string:

sqb.MultipleActiveResultSets = true;

This property allows one open connection for multiple datareaders.

Python lookup hostname from IP with 1 second timeout

>>> import socket
>>> socket.gethostbyaddr("69.59.196.211")
('stackoverflow.com', ['211.196.59.69.in-addr.arpa'], ['69.59.196.211'])

For implementing the timeout on the function, this stackoverflow thread has answers on that.

What are the differences between .gitignore and .gitkeep?

.gitkeep is just a placeholder. A dummy file, so Git will not forget about the directory, since Git tracks only files.

If you want an empty directory and make sure it stays 'clean' for Git, create a .gitignore containing the following lines within:

# .gitignore sample
###################

# Ignore all files in this dir...
*

# ... except for this one.
!.gitignore

If you desire to have only one type of files being visible to Git, here is an example how to filter everything out, except .gitignore and all .txt files:

# .gitignore to keep just .txt files
###################################

# Filter everything...
*

# ... except the .gitignore...
!.gitignore

# ... and all text files.
!*.txt

('#' indicates comments.)

Unexpected character encountered while parsing value

If you are using downloading data using url...may need to use

var result = client.DownloadData(url);

Parse RSS with jQuery

Update (Oct 15, 2019)

I extracted the core logic from jquery-rss to a new library called Vanilla RSS which is using the fetch API and can work without any additional dependencies:

const RSS = require('vanilla-rss');
const rss = new RSS(
    document.querySelector("#your-div"),
    "http://www.recruiter.com/feed/career.xml",
    { 
      // options go here
    }
);
rss.render().then(() => {
  console.log('Everything is loaded and rendered');
});

Original

post:

You can also use jquery-rss, which comes with nice templating and is super easy to use:

$("#your-div").rss("http://www.recruiter.com/feed/career.xml", {
    limit: 3,
    layoutTemplate: '<ul class="inline">{entries}</ul>',
    entryTemplate: '<li><a href="{url}">[{author}@{date}] {title}</a><br/>{shortBodyPlain}</li>'
})

yields (as of Sept 18, 2013):

<div id="your-div">
    <ul class="inline">
    <entries></entries>
    </ul>
    <ul class="inline">
        <li><a href="http://www.recruiter.com/i/when-to-go-over-a-recruiter%e2%80%99s-head/">[@Tue, 10 Sep 2013 22:23:51 -0700] When to Go Over a Recruiter's Head</a><br>Job seekers tend to have a certain "fear" of recruiters and hiring managers, and I mean fear in the reverence and respect ...</li>
        <li><a href="http://www.recruiter.com/i/the-perfect-job/">[@Tue, 10 Sep 2013 14:52:40 -0700] The Perfect Job</a><br>Having long ago dealt with the "perfect resume" namely God's, in a previous article of mine, it makes sense to consider the ...</li>
        <li><a href="http://www.recruiter.com/i/unemployment-benefits-applications-remain-near-5-year-low-decline-again/">[@Mon, 09 Sep 2013 12:49:17 -0700] Unemployment Benefits Applications Remain Near 5-Year Low, Decline Again</a><br>As reported by the U.S. Department of Labor, the number of workers seeking unemployment benefits continued to sit near ...</li>
    </ul>
</div>

See http://jsfiddle.net/sdepold/ozq2dn9e/1/ for a working example.

HTTP 415 unsupported media type error when calling Web API 2 endpoint

SOLVED
After banging my head on the wall for a couple days with this issue, it was looking like the problem had something to do with the content type negotiation between the client and server. I dug deeper into that using Fiddler to check the request details coming from the client app, here's a screenshot of the raw request as captured by fiddler:

What's obviously missing there is the Content-Type header, even though I was setting it as seen in the code sample in my original post. I thought it was strange that the Content-Type never came through even though I was setting it, so I had another look at my other (working) code calling a different Web API service, the only difference was that I happened to be setting the req.ContentType property prior to writing to the request body in that case. I made that change to this new code and that did it, the Content-Type was now showing up and I got the expected success response from the web service. The new code from my .NET client now looks like this:

req.Method = "POST"
req.ContentType = "application/json"
lstrPagingJSON = JsonSerializer(Of Paging)(lPaging)
bytData = Encoding.UTF8.GetBytes(lstrPagingJSON)
req.ContentLength = bytData.Length
reqStream = req.GetRequestStream()
reqStream.Write(bytData, 0, bytData.Length)
reqStream.Close()
'// Content-Type was being set here, causing the problem
'req.ContentType = "application/json"

That's all it was, the ContentType property just needed to be set prior to writing to the request body

I believe this behavior is because once content is written to the body it is streamed to the service endpoint being called, any other attributes pertaining to the request need to be set prior to that. Please correct me if I'm wrong or if this needs more detail.

JavaScript window resize event

jQuery is just wrapping the standard resize DOM event, eg.

window.onresize = function(event) {
    ...
};

jQuery may do some work to ensure that the resize event gets fired consistently in all browsers, but I'm not sure if any of the browsers differ, but I'd encourage you to test in Firefox, Safari, and IE.

How can I update npm on Windows?

You can use these commands:

npm cache clean
npm update -g [package....]

If you are upgrading from a previous version of node, then you will want to update all existing global packages. You can also specify the package name to be updated.

Disable / Check for Mock Location (prevent gps spoofing)

I have done some investigation and sharing my results here,this may be useful for others.

First, we can check whether MockSetting option is turned ON

public static boolean isMockSettingsON(Context context) {
    // returns true if mock location enabled, false if not enabled.
    if (Settings.Secure.getString(context.getContentResolver(),
                                Settings.Secure.ALLOW_MOCK_LOCATION).equals("0"))
        return false;
    else
        return true;
}

Second, we can check whether are there other apps in the device, which are using android.permission.ACCESS_MOCK_LOCATION (Location Spoofing Apps)

public static boolean areThereMockPermissionApps(Context context) {
    int count = 0;

    PackageManager pm = context.getPackageManager();
    List<ApplicationInfo> packages =
        pm.getInstalledApplications(PackageManager.GET_META_DATA);

    for (ApplicationInfo applicationInfo : packages) {
        try {
            PackageInfo packageInfo = pm.getPackageInfo(applicationInfo.packageName,
                                                        PackageManager.GET_PERMISSIONS);

            // Get Permissions
            String[] requestedPermissions = packageInfo.requestedPermissions;

            if (requestedPermissions != null) {
                for (int i = 0; i < requestedPermissions.length; i++) {
                    if (requestedPermissions[i]
                        .equals("android.permission.ACCESS_MOCK_LOCATION")
                        && !applicationInfo.packageName.equals(context.getPackageName())) {
                        count++;
                    }
                }
            }
        } catch (NameNotFoundException e) {
            Log.e("Got exception " , e.getMessage());
        }
    }

    if (count > 0)
        return true;
    return false;
}

If both above methods, first and second are true, then there are good chances that location may be spoofed or fake.

Now, spoofing can be avoided by using Location Manager's API.

We can remove the test provider before requesting the location updates from both the providers (Network and GPS)

LocationManager lm = (LocationManager) getSystemService(LOCATION_SERVICE);

try {
    Log.d(TAG ,"Removing Test providers")
    lm.removeTestProvider(LocationManager.GPS_PROVIDER);
} catch (IllegalArgumentException error) {
    Log.d(TAG,"Got exception in removing test  provider");
}

lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 0, locationListener);

I have seen that removeTestProvider(~) works very well over Jelly Bean and onwards version. This API appeared to be unreliable till Ice Cream Sandwich.

Flutter Update: Use Geolocator and check Position object's isMocked property.

How to import a csv file using python with headers intact, where first column is a non-numerical

For Python 3

Remove the rb argument and use either r or don't pass argument (default read mode).

with open( <path-to-file>, 'r' ) as theFile:
    reader = csv.DictReader(theFile)
    for line in reader:
        # line is { 'workers': 'w0', 'constant': 7.334, 'age': -1.406, ... }
        # e.g. print( line[ 'workers' ] ) yields 'w0'
        print(line)

For Python 2

import csv
with open( <path-to-file>, "rb" ) as theFile:
    reader = csv.DictReader( theFile )
    for line in reader:
        # line is { 'workers': 'w0', 'constant': 7.334, 'age': -1.406, ... }
        # e.g. print( line[ 'workers' ] ) yields 'w0'

Python has a powerful built-in CSV handler. In fact, most things are already built in to the standard library.

Case in Select Statement

I think these could be helpful for you .

Using a SELECT statement with a simple CASE expression

Within a SELECT statement, a simple CASE expression allows for only an equality check; no other comparisons are made. The following example uses the CASE expression to change the display of product line categories to make them more understandable.

USE AdventureWorks2012;
GO
SELECT   ProductNumber, Category =
      CASE ProductLine
         WHEN 'R' THEN 'Road'
         WHEN 'M' THEN 'Mountain'
         WHEN 'T' THEN 'Touring'
         WHEN 'S' THEN 'Other sale items'
         ELSE 'Not for sale'
      END,
   Name
FROM Production.Product
ORDER BY ProductNumber;
GO

Using a SELECT statement with a searched CASE expression

Within a SELECT statement, the searched CASE expression allows for values to be replaced in the result set based on comparison values. The following example displays the list price as a text comment based on the price range for a product.

USE AdventureWorks2012;
GO
SELECT   ProductNumber, Name, "Price Range" = 
      CASE 
         WHEN ListPrice =  0 THEN 'Mfg item - not for resale'
         WHEN ListPrice < 50 THEN 'Under $50'
         WHEN ListPrice >= 50 and ListPrice < 250 THEN 'Under $250'
         WHEN ListPrice >= 250 and ListPrice < 1000 THEN 'Under $1000'
         ELSE 'Over $1000'
      END
FROM Production.Product
ORDER BY ProductNumber ;
GO

Using CASE in an ORDER BY clause

The following examples uses the CASE expression in an ORDER BY clause to determine the sort order of the rows based on a given column value. In the first example, the value in the SalariedFlag column of the HumanResources.Employee table is evaluated. Employees that have the SalariedFlag set to 1 are returned in order by the BusinessEntityID in descending order. Employees that have the SalariedFlag set to 0 are returned in order by the BusinessEntityID in ascending order. In the second example, the result set is ordered by the column TerritoryName when the column CountryRegionName is equal to 'United States' and by CountryRegionName for all other rows.

SELECT BusinessEntityID, SalariedFlag
FROM HumanResources.Employee
ORDER BY CASE SalariedFlag WHEN 1 THEN BusinessEntityID END DESC
        ,CASE WHEN SalariedFlag = 0 THEN BusinessEntityID END;
GO


SELECT BusinessEntityID, LastName, TerritoryName, CountryRegionName
FROM Sales.vSalesPerson
WHERE TerritoryName IS NOT NULL
ORDER BY CASE CountryRegionName WHEN 'United States' THEN TerritoryName
         ELSE CountryRegionName END;

Using CASE in an UPDATE statement

The following example uses the CASE expression in an UPDATE statement to determine the value that is set for the column VacationHours for employees with SalariedFlag set to 0. When subtracting 10 hours from VacationHours results in a negative value, VacationHours is increased by 40 hours; otherwise, VacationHours is increased by 20 hours. The OUTPUT clause is used to display the before and after vacation values.

USE AdventureWorks2012;
GO
UPDATE HumanResources.Employee
SET VacationHours = 
    ( CASE
         WHEN ((VacationHours - 10.00) < 0) THEN VacationHours + 40
         ELSE (VacationHours + 20.00)
       END
    )
OUTPUT Deleted.BusinessEntityID, Deleted.VacationHours AS BeforeValue, 
       Inserted.VacationHours AS AfterValue
WHERE SalariedFlag = 0;

Using CASE in a HAVING clause

The following example uses the CASE expression in a HAVING clause to restrict the rows returned by the SELECT statement. The statement returns the the maximum hourly rate for each job title in the HumanResources.Employee table. The HAVING clause restricts the titles to those that are held by men with a maximum pay rate greater than 40 dollars or women with a maximum pay rate greater than 42 dollars.

USE AdventureWorks2012;
GO
SELECT JobTitle, MAX(ph1.Rate)AS MaximumRate
FROM HumanResources.Employee AS e
JOIN HumanResources.EmployeePayHistory AS ph1 ON e.BusinessEntityID = ph1.BusinessEntityID
GROUP BY JobTitle
HAVING (MAX(CASE WHEN Gender = 'M' 
        THEN ph1.Rate 
        ELSE NULL END) > 40.00
     OR MAX(CASE WHEN Gender  = 'F' 
        THEN ph1.Rate  
        ELSE NULL END) > 42.00)
ORDER BY MaximumRate DESC;

For more details description of these example visit the source.

Also visit here and here for some examples with great details.

How to connect PHP with Microsoft Access database

If you are just getting started with a new project then I would suggest that you use PDO instead of the old odbc_exec() approach. Here is a simple example:

<?php
$bits = 8 * PHP_INT_SIZE;
echo "(Info: This script is running as $bits-bit.)\r\n\r\n";

$connStr = 
        'odbc:Driver={Microsoft Access Driver (*.mdb, *.accdb)};' .
        'Dbq=C:\\Users\\Gord\\Desktop\\foo.accdb;';

$dbh = new PDO($connStr);
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$sql = 
        "SELECT AgentName FROM Agents " .
        "WHERE ID < ? AND AgentName <> ?";
$sth = $dbh->prepare($sql);

// query parameter value(s)
$params = array(
        5,
        'Homer'
        );

$sth->execute($params);

while ($row = $sth->fetch()) {
    echo $row['AgentName'] . "\r\n";
}

NOTE: The above approach is sufficient if you do not need to support Unicode characters above U+00FF. If you do need to support such characters then neither PDO_ODBC nor the old odbc_ functions will work; you'll need to use the solution described in this answer.

How to cut an entire line in vim and paste it?

press 'V' in normal mode to select the entire line
then press 'y' to copy it
go to the place you want to paste it and press 'p' to paste after cursor or 'P' to paste before it.

Python functions call by reference

Python is neither pass-by-value nor pass-by-reference. It's more of "object references are passed by value" as described here:

Here's why it's not pass-by-value. Because

def append(list):
    list.append(1)

list = [0]
reassign(list)
append(list)

returns [0,1] showing that some kind of reference was clearly passed as pass-by-value does not allow a function to alter the parent scope at all.

Looks like pass-by-reference then, hu? Nope.

Here's why it's not pass-by-reference. Because

def reassign(list):
  list = [0, 1]

list = [0]
reassign(list)
print list

returns [0] showing that the original reference was destroyed when list was reassigned. pass-by-reference would have returned [0,1].

For more information look here:

If you want your function to not manipulate outside scope, you need to make a copy of the input parameters that creates a new object.

from copy import copy

def append(list):
  list2 = copy(list)
  list2.append(1)
  print list2

list = [0]
append(list)
print list

How to compare pointers?

Yes, that is the definition of raw pointer equality: they both point to the same location (or are pointer aliases); usually in the virtual address space of the process running your application coded in C++ and managed by some operating system (but C++ can also be used for programming embedded devices with micro-controllers having a Harward architecture: on such microcontrollers some pointer casts are forbidden and makes no sense - since read only data could sit in code ROM)

For C++, read a good C++ programming book, see this C++ reference website, read the documentation of your C++ compiler (perhaps GCC or Clang) and consider coding with smart pointers. Maybe read also some draft C++ standard, like n4713 or buy the official standard from your ISO representative.

The concepts and terminology of garbage collection are also relevant when managing pointers and memory zones obtained by dynamic allocation (e.g. ::operator new), so read perhaps the GC handbook.

For pointers on Linux machines, see also this.

JavaScript math, round to two decimal places

Fastest Way - faster than toFixed():

TWO DECIMALS

x      = .123456
result = Math.round(x * 100) / 100  // result .12

THREE DECIMALS

x      = .123456
result = Math.round(x * 1000) / 1000      // result .123

Backporting Python 3 open(encoding="utf-8") to Python 2

Not a general answer, but may be useful for the specific case where you are happy with the default python 2 encoding, but want to specify utf-8 for python 3:

if sys.version_info.major > 2:
    do_open = lambda filename: open(filename, encoding='utf-8')
else:
    do_open = lambda filename: open(filename)

with do_open(filename) as file:
    pass

SSH configuration: override the default username

man ssh_config says

User
Specifies the user to log in as. This can be useful when a different user name is used on different machines. This saves the trouble of having to remember to give the user name on the command line.

Where's my invalid character (ORA-00911)

One of the reason may be if any one of table column have an underscore(_) in its name . That is considered as invalid characters by the JDBC . Rename the column by a ALTER Command and change in your code SQL , that will fix .

int to unsigned int conversion

Since we know that i is an int, you can just go ahead and unsigneding it!

This would do the trick:

int i = -62;
unsigned int j = unsigned(i);

finding and replacing elements in a list

You can simply use list comprehension in python:

def replace_element(YOUR_LIST, set_to=NEW_VALUE):
    return [i
            if SOME_CONDITION
            else NEW_VALUE
            for i in YOUR_LIST]

for your case, where you want to replace all occurrences of 1 with 10, the code snippet will be like this:

def replace_element(YOUR_LIST, set_to=10):
    return [i
            if i != 1  # keeps all elements not equal to one
            else set_to  # replaces 1 with 10
            for i in YOUR_LIST]

How can I run MongoDB as a Windows service?

Working on Mongo DB: 3.6

(1) Install MongoDB

(2) Add bin to environment path variable

(3) Create c:\data\db

(4) Create c:\data\mongod.log

(5) Run below Command on bin folder

.\mongod.exe --install --logpath c:\data\mongod.log --logappend --bind_ip 12 7.0.0.1 --dbpath c:\data\db

(6) To start mongo db as service

net start MongoDB

(7) Finally run mongo in command line to check mongo shell is open or not.

Where is SQL Server Management Studio 2012?

On the Official SQL Server 2012 ISO that's for download, just navigate to \x64\Setup\ (or \x86\Setup) and you will find "sql_ssms.msi". It's only about 60 MB, and since it's an .MSI you can probably provision it to be installed automatically (say for a large lab or classroom environment).

How to get JSON objects value if its name contains dots?

If json object key/name contains dot......! like

var myJson = {"my.name":"vikas","my.age":27}

Than you can access like

myJson["my.name"]
myJson["my.age"]

Converting pfx to pem using openssl

Another perspective for doing it on Linux... here is how to do it so that the resulting single file contains the decrypted private key so that something like HAProxy can use it without prompting you for passphrase.

openssl pkcs12 -in file.pfx -out file.pem -nodes

Then you can configure HAProxy to use the file.pem file.

This is an EDIT from previous version where I had these multiple steps until I realized the -nodes option just simply bypasses the private key encryption. But I'm leaving it here as it may just help with teaching.

openssl pkcs12 -in file.pfx -out file.nokey.pem -nokeys
openssl pkcs12 -in file.pfx -out file.withkey.pem
openssl rsa -in file.withkey.pem -out file.key
cat file.nokey.pem file.key > file.combo.pem

The 1st step prompts you for the password to open the PFX.
The 2nd step prompts you for that plus also to make up a passphrase for the key.
The 3rd step prompts you to enter the passphrase you just made up to store decrypted.
The 4th puts it all together into 1 file.

Then you can configure HAProxy to use the file.combo.pem file.

The reason why you need 2 separate steps where you indicate a file with the key and another without the key, is because if you have a file which has both the encrypted and decrypted key, something like HAProxy still prompts you to type in the passphrase when it uses it.

System.Collections.Generic.IEnumerable' does not contain any definition for 'ToList'

An alternative to adding LINQ would be to use this code instead:

List<Pax_Detail> paxList = new List<Pax_Detail>(pax);

What are ABAP and SAP?

with SAP, you might be referring to a popular business software:

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

And according to Wikipedia, ABAP is a programming language (short for Advanced Business Application Programming) created by SAP AG.

Uploading file using POST request in Node.js

Leonid Beschastny's answer works but I also had to convert ArrayBuffer to Buffer that is used in the Node's request module. After uploading file to the server I had it in the same format that comes from the HTML5 FileAPI (I'm using Meteor). Full code below - maybe it will be helpful for others.

function toBuffer(ab) {
  var buffer = new Buffer(ab.byteLength);
  var view = new Uint8Array(ab);
  for (var i = 0; i < buffer.length; ++i) {
    buffer[i] = view[i];
  }
  return buffer;
}

var req = request.post(url, function (err, resp, body) {
  if (err) {
    console.log('Error!');
  } else {
    console.log('URL: ' + body);
  }
});
var form = req.form();
form.append('file', toBuffer(file.data), {
  filename: file.name,
  contentType: file.type
});

Calling method using JavaScript prototype

If you know your super class by name, you can do something like this:

function Base() {
}

Base.prototype.foo = function() {
  console.log('called foo in Base');
}

function Sub() {
}

Sub.prototype = new Base();

Sub.prototype.foo = function() {
  console.log('called foo in Sub');
  Base.prototype.foo.call(this);
}

var base = new Base();
base.foo();

var sub = new Sub();
sub.foo();

This will print

called foo in Base
called foo in Sub
called foo in Base

as expected.

AngularJS event on window innerWidth size change

I found a jfiddle that might help here: http://jsfiddle.net/jaredwilli/SfJ8c/

Ive refactored the code to make it simpler for this.

// In your controller
var w = angular.element($window);
$scope.$watch(
  function () {
    return $window.innerWidth;
  },
  function (value) {
    $scope.windowWidth = value;
  },
  true
);

w.bind('resize', function(){
  $scope.$apply();
});

You can then reference to windowWidth from the html

<span ng-bind="windowWidth"></span>

How to remove the last character from a bash grep output

I am not finding that sed 's/;$//' works. It doesn't trim anything, though I'm wondering whether it's because the character I'm trying to trim off happens to be a "$". What does work for me is sed 's/.\{1\}$//'.

How can I use different certificates on specific connections?

If creating a SSLSocketFactory is not an option, just import the key into the JVM

Retrieve the public key: $openssl s_client -connect dev-server:443, then create a file dev-server.pem that looks like

-----BEGIN CERTIFICATE----- 
lklkkkllklklklklllkllklkl
lklkkkllklklklklllkllklkl
lklkkkllklk....
-----END CERTIFICATE-----

Import the key: #keytool -import -alias dev-server -keystore $JAVA_HOME/jre/lib/security/cacerts -file dev-server.pem. Password: changeit
Restart JVM

Source: How to solve javax.net.ssl.SSLHandshakeException?

Fastest check if row exists in PostgreSQL

select true from tablename where condition limit 1;

I believe that this is the query that postgres uses for checking foreign keys.

In your case, you could do this in one go too:

insert into yourtable select $userid, $rightid, $count where not (select true from yourtable where userid = $userid limit 1);

Calendar Recurring/Repeating Events - Best Storage Method

I would follow this guide: https://github.com/bmoeskau/Extensible/blob/master/recurrence-overview.md

Also make sure you use the iCal format so not to reinvent the wheel and remember Rule #0: Do NOT store individual recurring event instances as rows in your database!

When and why do I need to use cin.ignore() in C++?

When you want to throw away a specific number of characters from the input stream manually.

A very common use case is using this to safely ignore newline characters since cin will sometimes leave newline characters that you will have to go over to get to the next line of input.

Long story short it gives you flexibility when handling stream input.

How can I load webpage content into a div on page load?

Take a look into jQuery's .load() function:

<script>
    $(function(){
        $('#siteloader').load('http://www.somesitehere.com');
    });
</script>

However, this only works on the same domain of the JS file.

bootstrap 4 file input doesn't show the file name

$(document).on('change', '.custom-file-input', function (event) {
    $(this).next('.custom-file-label').html(event.target.files[0].name);
})

Best of all worlds. Works on dynamically created inputs, and uses actual file name.

How do I access (read, write) Google Sheets spreadsheets with Python?

Take a look at gspread port for api v4 - pygsheets. It should be very easy to use rather than the google client.

Sample example

import pygsheets

gc = pygsheets.authorize()

# Open spreadsheet and then workseet
sh = gc.open('my new ssheet')
wks = sh.sheet1

# Update a cell with value (just to let him know values is updated ;) )
wks.update_cell('A1', "Hey yank this numpy array")

# update the sheet with array
wks.update_cells('A2', my_nparray.to_list())

# share the sheet with your friend
sh.share("[email protected]")

See the docs here.

Author here.

How to log as much information as possible for a Java Exception?

A logging script that I have written some time ago might be of help, although it is not exactly what you want. It acts in a way like a System.out.println but with much more information about StackTrace etc. It also provides Clickable text for Eclipse:

private static final SimpleDateFormat   extended    = new SimpleDateFormat( "dd MMM yyyy (HH:mm:ss) zz" );

public static java.util.logging.Logger initLogger(final String name) {
    final java.util.logging.Logger logger = java.util.logging.Logger.getLogger( name );
    try {

        Handler ch = new ConsoleHandler();
        logger.addHandler( ch );

        logger.setLevel( Level.ALL ); // Level selbst setzen

        logger.setUseParentHandlers( false );

        final java.util.logging.SimpleFormatter formatter = new SimpleFormatter() {

            @Override
            public synchronized String format(final LogRecord record) {
                StackTraceElement[] trace = new Throwable().getStackTrace();
                String clickable = "(" + trace[ 7 ].getFileName() + ":" + trace[ 7 ].getLineNumber() + ") ";
                /* Clickable text in Console. */

                for( int i = 8; i < trace.length; i++ ) {
                    /* 0 - 6 is the logging trace, 7 - x is the trace until log method was called */
                    if( trace[ i ].getFileName() == null )
                        continue;
                    clickable = "(" + trace[ i ].getFileName() + ":" + trace[ i ].getLineNumber() + ") -> " + clickable;
                }

                final String time = "<" + extended.format( new Date( record.getMillis() ) ) + "> ";

                StringBuilder level = new StringBuilder("[" + record.getLevel() + "] ");
                while( level.length() < 15 ) /* extend for tabby display */
                    level.append(" ");

                StringBuilder name = new StringBuilder(record.getLoggerName()).append(": ");
                while( name.length() < 15 ) /* extend for tabby display */
                    name.append(" ");

                String thread = Thread.currentThread().getName();
                if( thread.length() > 18 ) /* trim if too long */
                    thread = thread.substring( 0, 16 ) + "..."; 
                else {
                    StringBuilder sb = new StringBuilder(thread);
                    while( sb.length() < 18 ) /* extend for tabby display */
                        sb.append(" ");
                    thread = sb.insert( 0, "Thread " ).toString();
                }

                final String message = "\"" + record.getMessage() + "\" ";

                return level + time + thread + name + clickable + message + "\n";
            }
        };
        ch.setFormatter( formatter );
        ch.setLevel( Level.ALL );
    } catch( final SecurityException e ) {
        e.printStackTrace();
    }
    return logger;
}

Notice this outputs to the console, you can change that, see http://docs.oracle.com/javase/1.4.2/docs/api/java/util/logging/Logger.html for more information on that.

Now, the following will probably do what you want. It will go through all causes of a Throwable and save it in a String. Note that this does not use StringBuilder, so you can optimize by changing it.

Throwable e = ...
String detail = e.getClass().getName() + ": " + e.getMessage();
for( final StackTraceElement s : e.getStackTrace() )
    detail += "\n\t" + s.toString();
while( ( e = e.getCause() ) != null ) {
    detail += "\nCaused by: ";
    for( final StackTraceElement s : e.getStackTrace() )
        detail += "\n\t" + s.toString();
}

Regards,
Danyel

Using env variable in Spring Boot's application.properties

The easiest way to have different configurations for different environments is to use spring profiles. See externalised configuration.

This gives you a lot of flexibility. I am using it in my projects and it is extremely helpful. In your case you would have 3 profiles: 'local', 'jenkins', and 'openshift'

You then have 3 profile specific property files: application-local.properties, application-jenkins.properties, and application-openshift.properties

There you can set the properties for the regarding environment. When you run the app you have to specify the profile to activate like this: -Dspring.profiles.active=jenkins

Edit

According to the spring doc you can set the system environment variable SPRING_PROFILES_ACTIVE to activate profiles and don't need to pass it as a parameter.

is there any way to pass active profile option for web app at run time ?

No. Spring determines the active profiles as one of the first steps, when building the application context. The active profiles are then used to decide which property files are read and which beans are instantiated. Once the application is started this cannot be changed.

regular expression for anything but an empty string

Create "regular expression to detect empty string", and then inverse it. Invesion of regular language is the regular language. I think regular expression library in what you leverage - should support it, but if not you always can write your own library.

grep --invert-match

include external .js file in node.js app

The correct answer is usually to use require, but in a few cases it's not possible.

The following code will do the trick, but use it with care:

var fs = require('fs');
var vm = require('vm');
var includeInThisContext = function(path) {
    var code = fs.readFileSync(path);
    vm.runInThisContext(code, path);
}.bind(this);
includeInThisContext(__dirname+"/models/car.js");

How do I parse a string into a number with Dart?

In Dart 2 int.tryParse is available.

It returns null for invalid inputs instead of throwing. You can use it like this:

int val = int.tryParse(text) ?? defaultValue;

Pass parameter from a batch file to a PowerShell script

Assuming your script is something like the below snippet and named testargs.ps1

param ([string]$w)
Write-Output $w

You can call this at the commandline as:

PowerShell.Exe -File C:\scripts\testargs.ps1 "Test String"

This will print "Test String" (w/o quotes) at the console. "Test String" becomes the value of $w in the script.

How to rsync only a specific list of files?

--files-from= parameter needs trailing slash if you want to keep the absolute path intact. So your command would become something like below:

rsync -av --files-from=/path/to/file / /tmp/

This could be done like there are a large number of files and you want to copy all files to x path. So you would find the files and throw output to a file like below:

find /var/* -name *.log > file

how to hide the content of the div in css

Best way to hide in html/css using display:none;

Example

<div id="divSample" class="hideClass">hi..</div>
<style>
.hideClass
{display:none;}
</style>

“Origin null is not allowed by Access-Control-Allow-Origin” error for request made by application running from a file:// URL

Make sure you are using the latest version of JQuery. We were facing this error for JQuery 1.10.2 and the error got resolved after using JQuery 1.11.1

How to convert a string to integer in C?

Ok, I had the same problem.I came up with this solution.It worked for me the best.I did try atoi() but didn't work well for me.So here is my solution:

void splitInput(int arr[], int sizeArr, char num[])
{
    for(int i = 0; i < sizeArr; i++)
        // We are subtracting 48 because the numbers in ASCII starts at 48.
        arr[i] = (int)num[i] - 48;
}

How do I get into a non-password protected Java keystore or change the password?

The password of keystore by default is: "changeit". I functioned to my commands you entered here, for the import of the certificate. I hope you have already solved your problem.

C# LINQ find duplicates in List

I created a extention to response to this you could includ it in your projects, I think this return the most case when you search for duplicates in List or Linq.

Example:

//Dummy class to compare in list
public class Person
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Surname { get; set; }
    public Person(int id, string name, string surname)
    {
        this.Id = id;
        this.Name = name;
        this.Surname = surname;
    }
}


//The extention static class
public static class Extention
{
    public static IEnumerable<T> getMoreThanOnceRepeated<T>(this IEnumerable<T> extList, Func<T, object> groupProps) where T : class
    { //Return only the second and next reptition
        return extList
            .GroupBy(groupProps)
            .SelectMany(z => z.Skip(1)); //Skip the first occur and return all the others that repeats
    }
    public static IEnumerable<T> getAllRepeated<T>(this IEnumerable<T> extList, Func<T, object> groupProps) where T : class
    {
        //Get All the lines that has repeating
        return extList
            .GroupBy(groupProps)
            .Where(z => z.Count() > 1) //Filter only the distinct one
            .SelectMany(z => z);//All in where has to be retuned
    }
}

//how to use it:
void DuplicateExample()
{
    //Populate List
    List<Person> PersonsLst = new List<Person>(){
    new Person(1,"Ricardo","Figueiredo"), //fist Duplicate to the example
    new Person(2,"Ana","Figueiredo"),
    new Person(3,"Ricardo","Figueiredo"),//second Duplicate to the example
    new Person(4,"Margarida","Figueiredo"),
    new Person(5,"Ricardo","Figueiredo")//third Duplicate to the example
    };

    Console.WriteLine("All:");
    PersonsLst.ForEach(z => Console.WriteLine("{0} -> {1} {2}", z.Id, z.Name, z.Surname));
    /* OUTPUT:
        All:
        1 -> Ricardo Figueiredo
        2 -> Ana Figueiredo
        3 -> Ricardo Figueiredo
        4 -> Margarida Figueiredo
        5 -> Ricardo Figueiredo
        */

    Console.WriteLine("All lines with repeated data");
    PersonsLst.getAllRepeated(z => new { z.Name, z.Surname })
        .ToList()
        .ForEach(z => Console.WriteLine("{0} -> {1} {2}", z.Id, z.Name, z.Surname));
    /* OUTPUT:
        All lines with repeated data
        1 -> Ricardo Figueiredo
        3 -> Ricardo Figueiredo
        5 -> Ricardo Figueiredo
        */
    Console.WriteLine("Only Repeated more than once");
    PersonsLst.getMoreThanOnceRepeated(z => new { z.Name, z.Surname })
        .ToList()
        .ForEach(z => Console.WriteLine("{0} -> {1} {2}", z.Id, z.Name, z.Surname));
    /* OUTPUT:
        Only Repeated more than once
        3 -> Ricardo Figueiredo
        5 -> Ricardo Figueiredo
        */
}

Having trouble setting working directory

This may help... use the following code and browse the folder you want to set as the working folder

setwd(choose.dir())

Passing multiple parameters with $.ajax url

Why are you combining GET and POST? Use one or the other.

$.ajax({
    type: 'post',
    data: {
        timestamp: timestamp,
        uid: uid
        ...
    }
});

php:

$uid =$_POST['uid'];

Or, just format your request properly (you're missing the ampersands for the get parameters).

url:"getdata.php?timestamp="+timestamp+"&uid="+id+"&uname="+name,

How to safely open/close files in python 2.4

No need to close the file according to the docs if you use with:

It is good practice to use the with keyword when dealing with file objects. This has the advantage that the file is properly closed after its suite finishes, even if an exception is raised on the way. It is also much shorter than writing equivalent try-finally blocks:

>>> with open('workfile', 'r') as f:
...     read_data = f.read()
>>> f.closed
True

More here: https://docs.python.org/2/tutorial/inputoutput.html#methods-of-file-objects

How to select date without time in SQL

You can try this one too.

SELECT CONVERT(DATE, GETDATE(), 120)

HTML Upload MAX_FILE_SIZE does not appear to work

To anyone who had been wonderstruck about some files being easily uploaded and some not, it could be a size issue. I'm sharing this as I was stuck with my PHP code not uploading large files and I kept assuming it wasn't uploading any Excel files. So, if you are using PHP and you want to increase the file upload limit, go to the php.ini file and make the following modifications:

upload_max_filesize = 2M

to be changed to

upload_max_filesize = 10M
post_max_size = 10M

or the size required. Then restart the Apache server and the upload will start magically working. Hope this will be of help to someone.

Send mail via Gmail with PowerShell V2's Send-MailMessage

I had massive problems with getting any of those scripts to work with sending mail in powershell. Turned out you need to create an app-password for your gmail-account to authenticate in the script. Now it works flawlessly!

Execute ssh with password authentication via windows command prompt

PuTTY's plink has a command-line argument for a password. Some other suggestions have been made in the answers to this question: using Expect (which is available for Windows), or writing a launcher in Python with Paramiko.

How to make custom dialog with rounded corners in android

I made a new way without having a background drawable is that make it have CardView as parent and give it a app:cardCornerRadius="20dp" and then add this in the java class dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));

It's another way to make it .

Objective-C declared @property attributes (nonatomic, copy, strong, weak)

Great answers! One thing that I would like to clarify deeper is nonatomic/atomic. The user should understand that this property - "atomicity" spreads only on the attribute's reference and not on it's contents. I.e. atomic will guarantee the user atomicity for reading/setting the pointer and only the pointer to the attribute. For example:

@interface MyClass: NSObject
@property (atomic, strong) NSDictionary *dict;
...

In this case it is guaranteed that the pointer to the dict will be read/set in the atomic manner by different threads. BUT the dict itself (the dictionary dict pointing to) is still thread unsafe, i.e. all read/add operations to the dictionary are still thread unsafe.

If you need thread safe collection you either have bad architecture (more often) OR real requirement (more rare). If it is "real requirement" - you should either find good&tested thread safe collection component OR be prepared for trials and tribulations writing your own one. It latter case look at "lock-free", "wait-free" paradigms. Looks like rocket-science at a first glance, but could help you achieving fantastic performance in comparison to "usual locking".

What is the parameter "next" used for in Express?

It passes control to the next matching route. In the example you give, for instance, you might look up the user in the database if an id was given, and assign it to req.user.

Below, you could have a route like:

app.get('/users', function(req, res) {
  // check for and maybe do something with req.user
});

Since /users/123 will match the route in your example first, that will first check and find user 123; then /users can do something with the result of that.

Route middleware is a more flexible and powerful tool, though, in my opinion, since it doesn't rely on a particular URI scheme or route ordering. I'd be inclined to model the example shown like this, assuming a Users model with an async findOne():

function loadUser(req, res, next) {
  if (req.params.userId) {
    Users.findOne({ id: req.params.userId }, function(err, user) {
      if (err) {
        next(new Error("Couldn't find user: " + err));
        return;
      }

      req.user = user;
      next();
    });
  } else {
    next();
  }
}

// ...

app.get('/user/:userId', loadUser, function(req, res) {
  // do something with req.user
});

app.get('/users/:userId?', loadUser, function(req, res) {
  // if req.user was set, it's because userId was specified (and we found the user).
});

// Pretend there's a "loadItem()" which operates similarly, but with itemId.
app.get('/item/:itemId/addTo/:userId', loadItem, loadUser, function(req, res) {
  req.user.items.append(req.item.name);
});

Being able to control flow like this is pretty handy. You might want to have certain pages only be available to users with an admin flag:

/**
 * Only allows the page to be accessed if the user is an admin.
 * Requires use of `loadUser` middleware.
 */
function requireAdmin(req, res, next) {
  if (!req.user || !req.user.admin) {
    next(new Error("Permission denied."));
    return;
  }

  next();
}

app.get('/top/secret', loadUser, requireAdmin, function(req, res) {
  res.send('blahblahblah');
});

Hope this gave you some inspiration!

Angularjs - simple form submit

WARNING This is for Angular 1.x

If you are looking for Angular (v2+, currently version 8), try this answer or the official guide.

ORIGINAL ANSWER

I have rewritten your JS fiddle here: http://jsfiddle.net/YGQT9/

<div ng-app="myApp">

    <form name="saveTemplateData" action="#" ng-controller="FormCtrl" ng-submit="submitForm()">

        First name:    <br/><input type="text" name="form.firstname">    
        <br/><br/>

        Email Address: <br/><input type="text" ng-model="form.emailaddress"> 
        <br/><br/>

        <textarea rows="3" cols="25">
          Describe your reason for submitting this form ... 
        </textarea> 
        <br/>

        <input type="radio" ng-model="form.gender" value="female" />Female
        <input type="radio" ng-model="form.gender" value="male" />Male 
        <br/><br/>

        <input type="checkbox" ng-model="form.member" value="true"/> Already a member
        <input type="checkbox" ng-model="form.member" value="false"/> Not a member
        <br/>

        <input type="file" ng-model="form.file_profile" id="file_profile">
        <br/>

        <input type="file" ng-model="form.file_avatar" id="file_avatar">
        <br/><br/>

        <input type="submit">
    </form>
</div>

Here I'm using lots of angular directives(ng-controller, ng-model, ng-submit) where you were using basic html form submission. Normally all alternatives to "The angular way" work, but form submission is intercepted and cancelled by Angular to allow you to manipulate the data before submission

BUT the JSFiddle won't work properly as it doesn't allow any type of ajax/http post/get so you will have to run it locally.

~~For general advice on angular form submission see the cookbook examples~~

UPDATE The cookbook is gone. Instead have a look at the 1.x guide for for form submission

The cookbook for angular has lots of sample code which will help as the docs aren't very user friendly.

Angularjs changes your entire web development process, don't try doing things the way you are used to with JQuery or regular html/js, but for everything you do take a look around for some sample code, as there is almost always an angular alternative.

OpenSSL: unable to verify the first certificate for Experian URL

I came across the same issue installing my signed certificate on an Amazon Elastic Load Balancer instance.

All seemed find via a browser (Chrome) but accessing the site via my java client produced the exception javax.net.ssl.SSLPeerUnverifiedException

What I had not done was provide a "certificate chain" file when installing my certificate on my ELB instance (see https://serverfault.com/questions/419432/install-ssl-on-amazon-elastic-load-balancer-with-godaddy-wildcard-certificate)

We were only sent our signed public key from the signing authority so I had to create my own certificate chain file. Using my browser's certificate viewer panel I exported each certificate in the signing chain. (The order of the certificate chain in important, see https://forums.aws.amazon.com/message.jspa?messageID=222086)

Add list to set?

Hopefully this helps:

>>> seta = set('1234')
>>> listb = ['a','b','c']
>>> seta.union(listb)
set(['a', 'c', 'b', '1', '3', '2', '4'])
>>> seta
set(['1', '3', '2', '4'])
>>> seta = seta.union(listb)
>>> seta
set(['a', 'c', 'b', '1', '3', '2', '4'])

document.body.appendChild(i)

It is working. Just modify to null check:

if(document.body != null){
    document.body.appendChild(element);
}

Pointy's suggestion is good; it may work, but I didn't try.

Getting absolute URLs using ASP.NET Core

You don't need to create an extension method for this

@Url.Action("Action", "Controller", values: null);

Action - Name of the action
Controller - Name of the controller
values - Object containing route values: aka GET parameters

There are also lots of other overloads to Url.Action you can use to generate links.

How to display tables on mobile using Bootstrap?

You might also consider trying one of these approaches, since larger tables aren't exactly friendly on mobile even if it works:

http://elvery.net/demo/responsive-tables/

I'm partial to 'No More Tables' but that obviously depends on your application.

Content Type application/soap+xml; charset=utf-8 was not supported by service

For me, it was very difficult to identify the problem because of a large number of methods and class involved.

What I did is commented (removed) some methods from the WebService interface and try, and then comment another bunch of methods and try, I kept doing this until I found the method that cause the problem.

In my case, it was using a complex object which cannot be serialized.

Good luck!

Dynamic SQL results into temp table in SQL Stored procedure

Try:

SELECT into #T1 execute ('execute ' + @SQLString )

And this smells real bad like an sql injection vulnerability.

correction (per @CarpeDiem's comment):

INSERT into #T1 execute ('execute ' + @SQLString )

also, omit the 'execute' if the sql string is something other than a procedure

Using for loop inside of a JSP

You concrete problem is caused because you're mixing discouraged and old school scriptlets <% %> with its successor EL ${}. They do not share the same variable scope. The allFestivals is not available in scriptlet scope and the i is not available in EL scope.

You should install JSTL (<-- click the link for instructions) and declare it in top of JSP as follows:

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

and then iterate over the list as follows:

<c:forEach items="${allFestivals}" var="festival">
    <tr>      
        <td>${festival.festivalName}</td>
        <td>${festival.location}</td>
        <td>${festival.startDate}</td>
        <td>${festival.endDate}</td>
        <td>${festival.URL}</td>  
    </tr>
</c:forEach>

(beware of possible XSS attack holes, use <c:out> accordingly)

Don't forget to remove the <jsp:useBean> as it has no utter value here when you're using a servlet as model-and-view controller. It would only lead to confusion. See also our servlets wiki page. Further you would do yourself a favour to disable scriptlets by the following entry in web.xml so that you won't accidently use them:

<jsp-config>
    <jsp-property-group>
        <url-pattern>*.jsp</url-pattern>
        <scripting-invalid>true</scripting-invalid>
    </jsp-property-group>
</jsp-config>

What is a provisioning profile used for when developing iPhone applications?

A Quote from : iPhone Developer Program (~8MB PDF)

A provisioning profile is a collection of digital entities that uniquely ties developers and devices to an authorized iPhone Development Team and enables a device to be used for testing. A Development Provisioning Profile must be installed on each device on which you wish to run your application code. Each Development Provisioning Profile will contain a set of iPhone Development Certificates, Unique Device Identifiers and an App ID. Devices specified within the provisioning profile can be used for testing only by those individuals whose iPhone Development Certificates are included in the profile. A single device can contain multiple provisioning profiles.

Which ORM should I use for Node.js and MySQL?

I would choose Sequelize because of it's excellent documentation. It's just a honest opinion (I never really used MySQL with Node that much).

Vue Js - Loop via v-for X times (in a range)

You can use an index in a range and then access the array via its index:

<ul>
  <li v-for="index in 10" :key="index">
    {{ shoppingItems[index].name }} - {{ shoppingItems[index].price }}
  </li>
</ul>

You can also check the Official Documentation for more information.

    remove_list=c()                             # create a vector

      for(i in 1:NROW(ls())){                   # repeat over all objects in environment
        if(class(get(ls()[i]))!="function"){    # if object is *not* a function
         remove_list=c(remove_list,ls()[i])     # ..add to vector remove_list
         }    
      }

    rm(list=remove_list)                        # remove all objects named in remove_list

Notes-

The argument "list" in rm(list=) must be a character vector.

The name of an object in position i of the current environment is returned from ls()[i] and the object itself from get(ls()[i]). Therefore the class of an object is returned from class(get(ls()[i]))

Batch files : How to leave the console window open

You can just put a pause command in the last line of your batch file:

@echo off
echo Hey, I'm just doing some work for you.
pause

Will give you something like this as output:

Hey, I'm just doing some work for you.

Press any key to continue ...

Note: Using the @echo prevents to output the command before the output is printed.

Convert integer to string Jinja

The OP needed to cast as string outside the {% set ... %}. But if that not your case you can do:

{% set curYear = 2013 | string() %}

Note that you need the parenthesis on that jinja filter.

If you're concatenating 2 variables, you can also use the ~ custom operator.

Programs & Examples On #Elasticity

Cannot install packages inside docker Ubuntu image

Can we rely on String.isEmpty for checking null condition on a String in Java?

Spring-Security-Oauth2: Full authentication is required to access this resource

How to set only time part of a DateTime variable in C#

jQuery - What are differences between $(document).ready and $(window).load?

Connection refused on docker container

How to make Bootstrap 4 cards the same height in card-columns?

XML parsing of a variable string in JavaScript

Eloquent: find() and where() usage laravel

Check for column name in a SqlDataReader object

Using new line(\n) in string and rendering the same in HTML

How do you setLayoutParams() for an ImageView?

Return generated pdf using spring MVC

How can I apply styles to multiple classes at once?

How to automatically close cmd window after batch file execution?

TINYTEXT, TEXT, MEDIUMTEXT, and LONGTEXT maximum storage sizes

Table cell widths - fixing width, wrapping/truncating long words

Creating random colour in Java?

Laravel 4 with Sentry 2 add user to a group on Registration

Div vertical scrollbar show

reading HttpwebResponse json response, C#

top nav bar blocking top content of the page

jQuery DataTables Getting selected row values

using jQuery .animate to animate a div from right to left?

Concatenating two std::vectors

How to find a whole word in a String in java

Alternate output format for psql

How to increment variable under DOS?

Creating virtual directories in IIS express

SQL Developer with JDK (64 bit) cannot find JVM

Copy rows from one table to another, ignoring duplicates

Web link to specific whatsapp contact

How to perform a for loop on each character in a string in Bash?

Renaming Columns in an SQL SELECT Statement

Link error "undefined reference to `__gxx_personality_v0'" and g++

What does '?' do in C++?

Link to Flask static files with url_for

How to read AppSettings values from a .json file in ASP.NET Core

iPhone/iPad browser simulator?

Find a file by name in Visual Studio Code

How do you extract classes' source code from a dll file?

Install gitk on Mac

Java Process with Input/Output Stream

What does getActivity() mean?

How to deal with bad_alloc in C++?

What is the C++ Standard specified behavior of new in c++?

What is the new_handler and set_new_handler?

How to handle out of memory conditions in C++?

What is the list of valid @SuppressWarnings warning names in Java?

blur vs focusout -- any real differences?

Gradle to execute Java class (without modifying build.gradle)

application plugin

JavaExec task

'ng' is not recognized as an internal or external command, operable program or batch file

how to concatenate two dictionaries to create a new one in Python?

Python 3

Python 2.6 & 2.7

Understanding __get__ and __set__ and Python descriptors

How to reduce the space between <p> tags?

bypass invalid SSL certificate in .net core

ios app maximum memory budget

How to recover stashed uncommitted changes

How do you upload a file to a document library in sharepoint?

Java FileWriter how to write to next Line

How to implement the ReLU function in Numpy

Perform Button click event when user press Enter key in Textbox

How to get the latest file in a folder?

Read a Csv file with powershell and capture corresponding data

How to convert std::string to lower case?

Python group by

How to display length of filtered ng-repeat data

Which programming languages can be used to develop in Android?

Python: Pandas pd.read_excel giving ImportError: Install xlrd >= 0.9.0 for Excel support

Setting a div's height in HTML with CSS

Keyboard shortcut for Jump to Previous View Location (Navigate back/forward) in IntelliJ IDEA

Why does "npm install" rewrite package-lock.json?

How to return a 200 HTTP Status Code from ASP.NET MVC 3 controller

Android Studio Gradle project "Unable to start the daemon process /initialization of VM"

Bundle ID Suffix? What is it?

What is the C++ Standard specified behavior of `new` in c++?

What is the `new_handler` and `set_new_handler`?

`application` plugin

`JavaExec` task

Understanding get and set and Python descriptors