Programs & Examples On #Method signature

In computer programming, especially object-oriented programming, a method is commonly identified by its unique method signature, which usually includes the method name, and the number, types and order of its parameters. A method signature is the smallest type of a method.

How to return an array from a function?

Well if you want to return your array from a function you must make sure that the values are not stored on the stack as they will be gone when you leave the function.

So either make your array static or allocate the memory (or pass it in but your initial attempt is with a void parameter). For your method I would define it like this:

int *gnabber(){
  static int foo[] = {1,2,3}
  return foo;
}

How do I get the file name from a String containing the Absolute file path?

extract file name using java regex *.

public String extractFileName(String fullPathFile){
        try {
            Pattern regex = Pattern.compile("([^\\\\/:*?\"<>|\r\n]+$)");
            Matcher regexMatcher = regex.matcher(fullPathFile);
            if (regexMatcher.find()){
                return regexMatcher.group(1);
            }
        } catch (PatternSyntaxException ex) {
            LOG.info("extractFileName::pattern problem <"+fullPathFile+">",ex);
        }
        return fullPathFile;
    }

syntax error when using command line in python

I faced a similar problem, on my Windows computer, please do check that you have set the Environment Variables correctly.

To check that Environment variable is set correctly:

  1. Open cmd.exe

  2. Type Python and press return

  3. (a) If it outputs the version of python then the environment variables are set correctly.

    (b) If it outputs "no such program or file name" then your environment variable are not set correctly.

To set environment variable:

  1. goto Computer-> System Properties-> Advanced System Settings -> Set Environment Variables
  2. Goto path in the system variables; append ;C:\Python27 in the end.

If you have correct variables already set; then you are calling the file inside the python interpreter.

Can't execute jar- file: "no main manifest attribute"

Found a great solution which would help in any such situation, given you just need a runnable jar, which you do in most cases. If your application is running in Intellij Idea follow these steps: 1) Go to module settings and then artifacts, and add a jar and define main class 2) Then go to Build in the menu and click "build artifact" and you get the jar.

This worked even when I changed the source folder and used scala instead of java.

ajax jquery simple get request

var settings = {
        "async": true,
        "crossDomain": true,
        "url": "<your URL Here>",
        "method": "GET",
        "headers": {
            "content-type": "application/x-www-form-urlencoded"
        },
        "data": {
            "username": "[email protected]",
            "password": "12345678"
        }
    }

    $.ajax(settings).done(function (response) {
        console.log(response);
    });

How to convert string to Date in Angular2 \ Typescript?

You can use date filter to convert in date and display in specific format.

In .ts file (typescript):

let dateString = '1968-11-16T00:00:00' 
let newDate = new Date(dateString);

In HTML:

{{dateString |  date:'MM/dd/yyyy'}}

Below are some formats which you can implement :

Backend:

public todayDate = new Date();

HTML :

<select>
<option value=""></option>
<option value="MM/dd/yyyy">[{{todayDate | date:'MM/dd/yyyy'}}]</option>
<option value="EEEE, MMMM d, yyyy">[{{todayDate | date:'EEEE, MMMM d, yyyy'}}]</option>
<option value="EEEE, MMMM d, yyyy h:mm a">[{{todayDate | date:'EEEE, MMMM d, yyyy h:mm a'}}]</option>
<option value="EEEE, MMMM d, yyyy h:mm:ss a">[{{todayDate | date:'EEEE, MMMM d, yyyy h:mm:ss a'}}]</option>
<option value="MM/dd/yyyy h:mm a">[{{todayDate | date:'MM/dd/yyyy h:mm a'}}]</option>
<option value="MM/dd/yyyy h:mm:ss a">[{{todayDate | date:'MM/dd/yyyy h:mm:ss a'}}]</option>
<option value="MMMM d">[{{todayDate | date:'MMMM d'}}]</option>   
<option value="yyyy-MM-ddTHH:mm:ss">[{{todayDate | date:'yyyy-MM-ddTHH:mm:ss'}}]</option>
<option value="h:mm a">[{{todayDate | date:'h:mm a'}}]</option>
<option value="h:mm:ss a">[{{todayDate | date:'h:mm:ss a'}}]</option>      
<option value="EEEE, MMMM d, yyyy hh:mm:ss a">[{{todayDate | date:'EEEE, MMMM d, yyyy hh:mm:ss a'}}]</option>
<option value="MMMM yyyy">[{{todayDate | date:'MMMM yyyy'}}]</option> 
</select>

How can I query a value in SQL Server XML column

select
  Roles
from
  MyTable
where
  Roles.value('(/root/role)[1]', 'varchar(max)') like 'StringToSearchFor'

In case your column is not XML, you need to convert it. You can also use other syntax to query certain attributes of your XML data. Here is an example...

Let's suppose that data column has this:

<Utilities.CodeSystems.CodeSystemCodes iid="107" CodeSystem="2" Code="0001F" CodeTags="-19-"..../>

... and you only want the ones where CodeSystem = 2 then your query will be:

select 
  [data] 
from
  [dbo].[CodeSystemCodes_data]
  
where
  CAST([data] as XML).value('(/Utilities.CodeSystems.CodeSystemCodes/@CodeSystem)[1]', 'varchar(max)') = '2'

These pages will show you more about how to query XML in T-SQL:

Querying XML fields using t-sql

Flattening XML Data in SQL Server

EDIT

After playing with it a little bit more, I ended up with this amazing query that uses CROSS APPLY. This one will search every row (role) for the value you put in your like expression...

Given this table structure:

create table MyTable (Roles XML)

insert into MyTable values
('<root>
   <role>Alpha</role>
   <role>Gamma</role>
   <role>Beta</role>
</root>')

We can query it like this:

select * from 

(select 
       pref.value('(text())[1]', 'varchar(32)') as RoleName
from 
       MyTable CROSS APPLY

       Roles.nodes('/root/role') AS Roles(pref)
)  as Result

where RoleName like '%ga%'

You can check the SQL Fiddle here: http://sqlfiddle.com/#!18/dc4d2/1/0

No templates in Visual Studio 2017

If you have installed .NET desktop development and still you can't see the templates, then VS is probably getting the templates from your custom templates folder and not installed.

To fix that, copy the installed templates folder to custom.

This is your "installed" folder

C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\ProjectTemplates

This is your "custom" folder

C:\Users[your username]\Documents\Visual Studio\2017\Templates\ProjectTemplates

Typically this happens when you are at the office and you are running VS as an administrator and visual studio is confused how to merge both of them and if you notice they don't have the same folder structure and folder names.. One is CSHARP and the other C#....

I didn't have the same problem when I installed VS 2017 community edition at home though. This happened when I installed visual studio 2017 "enterprise" edition.

JUnit test for System.out.println()

If the function is printing to System.out, you can capture that output by using the System.setOut method to change System.out to go to a PrintStream provided by you. If you create a PrintStream connected to a ByteArrayOutputStream, then you can capture the output as a String.

// Create a stream to hold the output
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream ps = new PrintStream(baos);
// IMPORTANT: Save the old System.out!
PrintStream old = System.out;
// Tell Java to use your special stream
System.setOut(ps);
// Print some output: goes to your special stream
System.out.println("Foofoofoo!");
// Put things back
System.out.flush();
System.setOut(old);
// Show what happened
System.out.println("Here: " + baos.toString());

How to check if a string contains a substring in Bash

My .bash_profile file and how I used grep:

If the PATH environment variable includes my two bin directories, don't append them,

# .bash_profile
# Get the aliases and functions
if [ -f ~/.bashrc ]; then
    . ~/.bashrc
fi

U=~/.local.bin:~/bin

if ! echo "$PATH" | grep -q "home"; then
    export PATH=$PATH:${U}
fi

Renaming files in a folder to sequential numbers

Let us assume we have these files in a directory, listed in order of creation, the first being the oldest:

a.jpg
b.JPG
c.jpeg
d.tar.gz
e

then ls -1cr outputs exactly the list above. You can then use rename:

ls -1cr | xargs rename -n 's/^[^\.]*(\..*)?$/our $i; sprintf("%03d$1", $i++)/e'

which outputs

rename(a.jpg, 000.jpg)
rename(b.JPG, 001.JPG)
rename(c.jpeg, 002.jpeg)
rename(d.tar.gz, 003.tar.gz)
Use of uninitialized value $1 in concatenation (.) or string at (eval 4) line 1.
rename(e, 004)

The warning ”use of uninitialized value […]” is displayed for files without an extension; you can ignore it.

Remove -n from the rename command to actually apply the renaming.

This answer is inspired by Luke’s answer of April 2014. It ignores Gnutt’s requirement of setting the number of leading zeroes depending on the total amount of files.

In c, in bool, true == 1 and false == 0?

You neglected to say which version of C you are concerned about. Let's assume it's this one:

http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf

As you can see by reading the specification, the standard definitions of true and false are 1 and 0, yes.

If your question is about a different version of C, or about non-standard definitions for true and false, then ask a more specific question.

SQL Server Insert Example

Here are 4 ways to insert data into a table.

  1. Simple insertion when the table column sequence is known.

    INSERT INTO Table1 VALUES (1,2,...)

  2. Simple insertion into specified columns of the table.

    INSERT INTO Table1(col2,col4) VALUES (1,2)

  3. Bulk insertion when...

    1. You wish to insert every column of Table2 into Table1
    2. You know the column sequence of Table2
    3. You are certain that the column sequence of Table2 won't change while this statement is being used (perhaps you the statement will only be used once).

    INSERT INTO Table1 {Column sequence} SELECT * FROM Table2

  4. Bulk insertion of selected data into specified columns of Table2.

.

INSERT INTO Table1 (Column1,Column2 ....)
    SELECT Column1,Column2...
       FROM Table2

Detect changed input text box

I think you can use keydown too:

$('#fieldID').on('keydown', function (e) {
  //console.log(e.which);
  if (e.which === 8) {
    //do something when pressing delete
    return true;
  } else {
    //do something else
    return false;
  }
});

What is the regular expression to allow uppercase/lowercase (alphabetical characters), periods, spaces and dashes only?

Check out the basics of regular expressions in a tutorial. All it requires is two anchors and a repeated character class:

^[a-zA-Z ._-]*$

If you use the case-insensitive modifier, you can shorten this to

^[a-z ._-]*$

Note that the space is significant (it is just a character like any other).

Usage of unicode() and encode() functions in Python

You are using encode("utf-8") incorrectly. Python byte strings (str type) have an encoding, Unicode does not. You can convert a Unicode string to a Python byte string using uni.encode(encoding), and you can convert a byte string to a Unicode string using s.decode(encoding) (or equivalently, unicode(s, encoding)).

If fullFilePath and path are currently a str type, you should figure out how they are encoded. For example, if the current encoding is utf-8, you would use:

path = path.decode('utf-8')
fullFilePath = fullFilePath.decode('utf-8')

If this doesn't fix it, the actual issue may be that you are not using a Unicode string in your execute() call, try changing it to the following:

cur.execute(u"update docs set path = :fullFilePath where path = :path", locals())

Credentials for the SQL Server Agent service are invalid

I've had this error as a result of trying to use a cloned VM that had the same SID as the domain. The two options to fix it were: sysprep (or rebuild) the database server OR dcpromo the DC down and back up to change the domain SID.

Instagram API to fetch pictures with specific hashtags

Take a look here in order to get started: http://instagram.com/developer/

and then in order to retrieve pictures by tag, look here: http://instagram.com/developer/endpoints/tags/

Getting tags from Instagram doesn't require OAuth, so you can make the calls via these URLs:

GET IMAGES https://api.instagram.com/v1/tags/{tag-name}/media/recent?access_token={TOKEN}

SEARCH https://api.instagram.com/v1/tags/search?q={tag-query}&access_token={TOKEN}

TAG INFO https://api.instagram.com/v1/tags/{tag-name}?access_token={TOKEN}

How to check if a key exists in Json Object and get its value

Use:

if (containerObject.has("video")) {
    //get value of video
}

How do I view an older version of an SVN file?

Update to a specific revision:

svn up -r1234 file

ASP.NET jQuery Ajax Calling Code-Behind Method

Firstly, you probably want to add a return false; to the bottom of your Submit() method in JavaScript (so it stops the submit, since you're handling it in AJAX).

You're connecting to the complete event, not the success event - there's a significant difference and that's why your debugging results aren't as expected. Also, I've never made the signature methods match yours, and I've always provided a contentType and dataType. For example:

$.ajax({
        type: "POST",
        url: "Default.aspx/OnSubmit",
        data: dataValue,                
        contentType: 'application/json; charset=utf-8',
        dataType: 'json',
        error: function (XMLHttpRequest, textStatus, errorThrown) {
            alert("Request: " + XMLHttpRequest.toString() + "\n\nStatus: " + textStatus + "\n\nError: " + errorThrown);
        },
        success: function (result) {
            alert("We returned: " + result);
        }
    });

Converting Java file:// URL to File(...) path, platform independent, including UNC paths

Building on @SotiriosDelimanolis's comment, here is a method to deal with URLs (such as file:...) and non-URLs (such as C:...), using Spring's FileSystemResource:

public FileSystemResource get(String file) {
    try {
        // First try to resolve as URL (file:...)
        Path path = Paths.get(new URL(file).toURI());
        FileSystemResource resource = new FileSystemResource(path.toFile());
        return resource;
    } catch (URISyntaxException | MalformedURLException e) {
        // If given file string isn't an URL, fall back to using a normal file 
        return new FileSystemResource(file);
    }
}

Rounded Corners Image in Flutter

Use this Way in this circle image is also working + you have preloader also for network image:

new ClipRRect(
     borderRadius: new BorderRadius.circular(30.0),
     child: FadeInImage.assetNetwork(
          placeholder:'asset/loader.gif',
          image: 'Your Image Path',
      ),
    )

css h1 - only as wide as the text

You could use a <span> instead of an <h1>.

How to get label text value form a html page?

You can use textContent attribute to retrieve data from a label.

 <script>
       var datas = document.getElementById("excel-data-div").textContent;
    </script>


<label id="excel-data-div" style="display: none;">
     Sample text
</label>

How to convert a private key to an RSA private key?

To Convert BEGIN OPENSSH PRIVATE KEY to BEGIN RSA PRIVATE KEY:

ssh-keygen -p -m PEM -f ~/.ssh/id_rsa

postgresql - add boolean column to table set default

If you are using postgresql then you have to use column type BOOLEAN in lower case as boolean.

ALTER TABLE users ADD "priv_user" boolean DEFAULT false;

What should be the values of GOPATH and GOROOT?

Here is one solution (single user):

GOROOT=$HOME/.local # your go executable is in $GOROOT/bin
GOPATH=$HOME/.gopath
PATH=$GOROOT/bin:$GOPATH/bin:$PATH

go complains if you change .gopath to .go.

I wish they went with how the rust/cargo guys did and just put everything at one place.

Bootstrap button drop-down inside responsive table not visible because of scroll

We solved this issue here at work by applying a .dropup class to the dropdown when the dropdown is close to the bottom of a table.enter image description here

How to reset all checkboxes using jQuery or pure JS?

If you mean how to remove the 'checked' state from all checkboxes:

$('input:checkbox').removeAttr('checked');

how to wait for first command to finish?

Shell scripts, no matter how they are executed, execute one command after the other. So your code will execute results.sh after the last command of st_new.sh has finished.

Now there is a special command which messes this up: &

cmd &

means: "Start a new background process and execute cmd in it. After starting the background process, immediately continue with the next command in the script."

That means & doesn't wait for cmd to do it's work. My guess is that st_new.sh contains such a command. If that is the case, then you need to modify the script:

cmd &
BACK_PID=$!

This puts the process ID (PID) of the new background process in the variable BACK_PID. You can then wait for it to end:

while kill -0 $BACK_PID ; do
    echo "Process is still active..."
    sleep 1
    # You can add a timeout here if you want
done

or, if you don't want any special handling/output simply

wait $BACK_PID

Note that some programs automatically start a background process when you run them, even if you omit the &. Check the documentation, they often have an option to write their PID to a file or you can run them in the foreground with an option and then use the shell's & command instead to get the PID.

Project has no default.properties file! Edit the project properties to set one

Just try these steps and i am sure it will definitely help you..

1.Just rename the project.properties to default.properties.

2.Delete your project from eclipse.

3.Again import your project into the eclipse.

Now the problem must be solve.

Please dont forget to give +1.

Perform curl request in javascript?

Yes, use getJSONP. It's the only way to make cross domain/server async calls. (*Or it will be in the near future). Something like

$.getJSON('your-api-url/validate.php?'+$(this).serialize+'callback=?', function(data){
if(data)console.log(data);
});

The callback parameter will be filled in automatically by the browser, so don't worry.

On the server side ('validate.php') you would have something like this

<?php
if(isset($_GET))
{
//if condition is met
echo $_GET['callback'] . '(' . "{'message' : 'success', 'userID':'69', 'serial' : 'XYZ99UAUGDVD&orwhatever'}". ')';
}
else echo json_encode(array('error'=>'failed'));
?>

Generate random numbers following a normal distribution in C/C++

A quick and easy method is just to sum a number of evenly distributed random numbers and take their average. See the Central Limit Theorem for a full explanation of why this works.

How do I display todays date on SSRS report?

  1. Inset Test box in the design area of the SSRS report.
  2. Right-click on the Textbox and scroll down and click on the Expression tab
  3. just type the given expression in the expression area: =format(Today,"dd/MM/yyyy")

Error Message: Type or namespace definition, or end-of-file expected

  1. Make sure you have System.Web referenced
  2. Get rid of the two } at the end.

How do I compare version numbers in Python?

What's wrong with transforming the version string into a tuple and going from there? Seems elegant enough for me

>>> (2,3,1) < (10,1,1)
True
>>> (2,3,1) < (10,1,1,1)
True
>>> (2,3,1,10) < (10,1,1,1)
True
>>> (10,3,1,10) < (10,1,1,1)
False
>>> (10,3,1,10) < (10,4,1,1)
True

@kindall's solution is a quick example of how good the code would look.

Adding a Method to an Existing Object Instance

What you're looking for is setattr I believe. Use this to set an attribute on an object.

>>> def printme(s): print repr(s)
>>> class A: pass
>>> setattr(A,'printme',printme)
>>> a = A()
>>> a.printme() # s becomes the implicit 'self' variable
< __ main __ . A instance at 0xABCDEFG>

How to update RecyclerView Adapter Data?

you have 2 options to do this: refresh UI from the adapter:

mAdapter.notifyDataSetChanged();

or refresh it from recyclerView itself:

recyclerView.invalidate();

fatal: could not read Username for 'https://github.com': No such file or directory

TL;DR: check if you can read/write to /dev/tty. If no and you have used su to open the shell, check if you have used it correctly.

I was facing the same problem but on Linux and I have found the issue. I don't have my credentials stored so I always input them on prompt:

Username for 'https://github.com': foo
Password for 'https://[email protected]': 

The way how git handles http(s) connections is using /usr/lib/git-core/git-remote-https you can see strace here:

stat("/usr/lib/git-core/git-remote-https", {st_mode=S_IFREG|0755, st_size=1366784, ...}) = 0
pipe([9, 10])                           = 0
rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f65398bb350) = 18177
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
close(10)                               = 0
read(9, "", 8)                          = 0
close(9)                                = 0
close(5)                                = 0
close(8)                                = 0
dup(7)                                  = 5
fcntl(5, F_GETFL)                       = 0 (flags O_RDONLY)
write(6, "capabilities\n", 13)          = 13
fstat(5, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
read(5, "fetch\noption\npush\ncheck-connecti"..., 4096) = 38
write(6, "option progress true\n", 21)  = 21
read(5, "ok\n", 4096)                   = 3
write(6, "option verbosity 1\n", 19)    = 19
read(5, "ok\n", 4096)                   = 3
stat(".git/packed-refs", {st_mode=S_IFREG|0664, st_size=675, ...}) = 0
lstat(".git/objects/10/52401742a2e9a3e8bf068b115c3818180bf19e", {st_mode=S_IFREG|0444, st_size=179, ...}) = 0
lstat(".git/objects/4e/35fa16cf8f2676600f56e9ba78cf730adc706e", {st_mode=S_IFREG|0444, st_size=178, ...}) = 0
dup(7)                                  = 8
fcntl(8, F_GETFL)                       = 0 (flags O_RDONLY)
close(8)                                = 0
write(6, "list for-push\n", 14)         = 14
read(5, fatal: could not read Username for 'https://github.com': No such device or address
"", 4096)                       = 0
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=18177, si_uid=1000, si_status=128, si_utime=6, si_stime=2} ---
exit_group(128)                         = ?
+++ exited with 128 +++

So I tried to call it directly:

echo "list for-push" | strace /usr/lib/git-core/git-remote-https my

and the result:

poll([{fd=3, events=POLLIN|POLLPRI|POLLRDNORM|POLLRDBAND}], 1, 0) = 1 ([{fd=3, revents=POLLIN|POLLRDNORM}])
recvfrom(3, "\27\3\3\1\32", 5, 0, NULL, NULL) = 5
recvfrom(3, "\307|4Q\21\306\334\244o\237-\230\255\336\25\215D\257\227\274\r\330\314U\5\17\217T\274\262M\223"..., 282, 0, NULL, NULL) = 282
openat(AT_FDCWD, "/dev/tty", O_RDONLY)  = -1 ENXIO (No such device or address)
openat(AT_FDCWD, "/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=2995, ...}) = 0
read(4, "# Locale name alias data base.\n#"..., 4096) = 2995
read(4, "", 4096)                       = 0
close(4)                                = 0
openat(AT_FDCWD, "/usr/share/locale/en_US/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/en/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale-langpack/en_US/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale-langpack/en/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
write(2, "fatal: could not read Username f"..., 83fatal: could not read Username for 'https://github.com': No such device or address
) = 83
exit_group(128)                         = ?
+++ exited with 128 +++

And here it came to me:

openat(AT_FDCWD, "/dev/tty", O_RDONLY)  = -1 ENXIO (No such device or address)
...
write(2, "fatal: could not read Username f"..., 83fatal: could not read Username for 'https://github.com': No such device or address
) = 83

git-remote-https tries to read credentials via /dev/tty so I tested if it works:

$ echo ahoj > /dev/tty
bash: /dev/tty: No such device or address

But in another terminal:

# echo ahoj > /dev/tty
ahoj

I knew I switched to this user using su so I exited the shell to see how and found out I used command su danman - so I tested it again:

~# su danman -
bash: cannot set terminal process group (-1): Inappropriate ioctl for device
bash: no job control in this shell
/root$ echo ahoj > /dev/tty
bash: /dev/tty: No such device or address

I probably ignored the message and continued working but this was the reason. When I switched using the correct su - danman everything worked fine:

~# su - danman
danman@speedy:~$ echo ahoj > /dev/tty
ahoj

After this, git started working correctly

Cannot find JavaScriptSerializer in .Net 4.0

This is how to get JavaScriptSerializer available in your application, targetting .NET 4.0 (full)

using System.Web.Script.Serialization;

This should allow you to create a new JavaScriptSerializer object!

Add "Are you sure?" to my excel button, how can I?

Just make a custom userform that is shown when the "delete" button is pressed, then link the continue button to the actual code that does the deleting. Make the cancel button hide the userform.

Celery Received unregistered task of type (run example)

I had the same problem running tasks from Celery Beat. Celery doesn't like relative imports so in my celeryconfig.py, I had to explicitly set the full package name:

app.conf.beat_schedule = {
   'add-every-30-seconds': {
        'task': 'full.path.to.add',
        'schedule': 30.0,
        'args': (16, 16)
    },
}

"Content is not allowed in prolog" when parsing perfectly valid XML on GAE

I had a tab character instead of spaces. Replacing the tab '\t' fixed the problem.

Cut and paste the whole doc into an editor like Notepad++ and display all characters.

How to set environment variables in PyCharm?

I was able to figure out this using a PyCharm plugin called EnvFile. This plugin, basically allows setting environment variables to run configurations from one or multiple files.

The installation is pretty simple:

Preferences > Plugins > Browse repositories... > Search for "Env File" > Install Plugin.

Then, I created a file, in my project root, called environment.env which contains:

DATABASE_URL=postgres://127.0.0.1:5432/my_db_name
DEBUG=1

Then I went to Run->Edit Configurations, and I followed the steps in the next image:

Set Environment Variables

In 3, I chose the file environment.env, and then I could just click the play button in PyCharm, and everything worked like a charm.

Python 2,3 Convert Integer to "bytes" Cleanly

You can use the struct's pack:

In [11]: struct.pack(">I", 1)
Out[11]: '\x00\x00\x00\x01'

The ">" is the byte-order (big-endian) and the "I" is the format character. So you can be specific if you want to do something else:

In [12]: struct.pack("<H", 1)
Out[12]: '\x01\x00'

In [13]: struct.pack("B", 1)
Out[13]: '\x01'

This works the same on both python 2 and python 3.

Note: the inverse operation (bytes to int) can be done with unpack.

Parsing GET request parameters in a URL that contains another URL

You may have to use urlencode on the string 'http://google.com/?var=234&key=234'

Is there an advantage to use a Synchronized Method instead of a Synchronized Block?

I suppose this question is about the difference between Thread Safe Singleton and Lazy initialization with Double check locking. I always refer to this article when I need to implement some specific singleton.

Well, this is a Thread Safe Singleton:

// Java program to create Thread Safe 
// Singleton class 
public class GFG  
{ 
  // private instance, so that it can be 
  // accessed by only by getInstance() method 
  private static GFG instance; 

  private GFG()  
  { 
    // private constructor 
  } 

 //synchronized method to control simultaneous access 
  synchronized public static GFG getInstance()  
  { 
    if (instance == null)  
    { 
      // if instance is null, initialize 
      instance = new GFG(); 
    } 
    return instance; 
  } 
} 

Pros:

  1. Lazy initialization is possible.

  2. It is thread safe.

Cons:

  1. getInstance() method is synchronized so it causes slow performance as multiple threads can’t access it simultaneously.

This is a Lazy initialization with Double check locking:

// Java code to explain double check locking 
public class GFG  
{ 
  // private instance, so that it can be 
  // accessed by only by getInstance() method 
  private static GFG instance; 

  private GFG()  
  { 
    // private constructor 
  } 

  public static GFG getInstance() 
  { 
    if (instance == null)  
    { 
      //synchronized block to remove overhead 
      synchronized (GFG.class) 
      { 
        if(instance==null) 
        { 
          // if instance is null, initialize 
          instance = new GFG(); 
        } 

      } 
    } 
    return instance; 
  } 
} 

Pros:

  1. Lazy initialization is possible.

  2. It is also thread safe.

  3. Performance reduced because of synchronized keyword is overcome.

Cons:

  1. First time, it can affect performance.

  2. As cons. of double check locking method is bearable so it can be used for high performance multi-threaded applications.

Please refer to this article for more details:

https://www.geeksforgeeks.org/java-singleton-design-pattern-practices-examples/

how to read System environment variable in Spring applicationContext

Thanks to @Yiling. That was a hint.

<bean id="propertyConfigurer"
        class="org.springframework.web.context.support.ServletContextPropertyPlaceholderConfigurer">

    <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />
    <property name="searchSystemEnvironment" value="true" />
    <property name="locations">
        <list>
            <value>file:#{systemEnvironment['FILE_PATH']}/first.properties</value>
            <value>file:#{systemEnvironment['FILE_PATH']}/second.properties</value>
            <value>file:#{systemEnvironment['FILE_PATH']}/third.properties</value>
        </list>
    </property>
</bean>

After this, you should have one environment variable named 'FILE_PATH'. Make sure you restart your terminal/IDE after creating that environment variable.

Revert a jQuery draggable object back to its original container on out event of droppable

I've found another easy way to deal with this problem, you just need the attribute " connectToSortable:" to draggable like as below code:

$("#a1,#a2").draggable({
        connectToSortable: "#b,#a",
        revert: 'invalid',
    });

PS: More detail and example
How to move Draggable objects between source area and target area with jQuery

EPPlus - Read Excel Table

Working solution with validate email,mobile number

 public class ExcelProcessing
        {
            public List<ExcelUserData> ReadExcel()
            {
                string path = Config.folderPath + @"\MemberUploadFormat.xlsx";
    
                using (var excelPack = new ExcelPackage())
                {
                    //Load excel stream
                    using (var stream = File.OpenRead(path))
                    {
                        excelPack.Load(stream);
                    }
    
                    //Lets Deal with first worksheet.(You may iterate here if dealing with multiple sheets)
                    var ws = excelPack.Workbook.Worksheets[0];
    
                    List<ExcelUserData> userList = new List<ExcelUserData>();
    
                    int colCount = ws.Dimension.End.Column;  //get Column Count
                    int rowCount = ws.Dimension.End.Row;
                       
                    for (int row = 2; row <= rowCount; row++) // start from to 2 omit header
                    {
                       
                        bool IsValid = true;
                        ExcelUserData _user = new ExcelUserData();
    
                        for (int col = 1; col <= colCount; col++)
                        {
                            if (col == 1)
                            {
                                _user.FirstName = ws.Cells[row, col].Value?.ToString().Trim();
                                if (string.IsNullOrEmpty(_user.FirstName))
                                {
                                    _user.ErrorMessage += "Enter FirstName <br/>";
                                    IsValid = false;
                                }
                            }
                            else if (col == 2)
                            {
                                _user.Email = ws.Cells[row, col].Value?.ToString().Trim();
    
                                if (string.IsNullOrEmpty(_user.Email))
                                {
                                    _user.ErrorMessage += "Enter Email <br/>";
                                    IsValid = false;
                                }
                                else if (!IsValidEmail(_user.Email))
                                {
                                    _user.ErrorMessage += "Invalid Email Address <br/>";
                                    IsValid = false;
                                }
                            }
                            else if (col ==3)
                            {
                                _user.MobileNo = ws.Cells[row, col].Value?.ToString().Trim();
    
                                if (string.IsNullOrEmpty(_user.MobileNo))
                                {
                                    _user.ErrorMessage += "Enter Mobile No <br/>";
                                    IsValid = false;
                                }
                                else if (_user.MobileNo.Length != 10)
                                {
                                    _user.ErrorMessage += "Invalid Mobile No <br/>";
                                    IsValid = false;
                                }
    
                            }
                            else if (col == 4)
                            {
                                _user.IsAdmin = ws.Cells[row, col].Value?.ToString().Trim();
    
                                if (string.IsNullOrEmpty(_user.IsAdmin))
                                {
                                    _user.IsAdmin = "0";
                                }
                            }
    
                            _user.IsValid = IsValid;
                        }
                        userList.Add(_user);
                    }
                    return userList;
                }
            }
            public static bool IsValidEmail(string email)
            {
                Regex regex = new Regex(@"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$",
                 RegexOptions.CultureInvariant | RegexOptions.Singleline);
    
                return regex.IsMatch(email);
            }
        }

ssh "permissions are too open" error

I've got the error in my windows 10 so I set permission as the following and it works.

Permission for id_rsa of windows 10

In details, remove other users/groups until it has only 'SYSTEM' and 'Administrators'. Then add your windows login into it with Read permission only.

Note the id_rsa file is under the c:\users\<username> folder.

Script not served by static file handler on IIS7.5

I encountered this error from IIS 8.5 when trying to access a WCF service I had written. Turns out the server didn't have the WCF HTTP Activation features turned on. Checked the boxes and clicked through the wizard, iisreset, started working.

Windows Features Panel

Converting .NET DateTime to JSON

What is returned is milliseconds since epoch. You could do:

var d = new Date();
d.setTime(1245398693390);
document.write(d);

On how to format the date exactly as you want, see full Date reference at http://www.w3schools.com/jsref/jsref_obj_date.asp

You could strip the non-digits by either parsing the integer (as suggested here):

var date = new Date(parseInt(jsonDate.substr(6)));

Or applying the following regular expression (from Tominator in the comments):

var jsonDate = jqueryCall();  // returns "/Date(1245398693390)/"; 
var re = /-?\d+/; 
var m = re.exec(jsonDate); 
var d = new Date(parseInt(m[0]));

How to enter special characters like "&" in oracle database?

We can use another way as well for example to insert the value with special characters 'Java_22 & Oracle_14' into db we can use the following format..

'Java_22 '||'&'||' Oracle_14'

Though it consider as 3 different tokens we dont have any option as the handling of escape sequence provided in the oracle documentation is incorrect.

How do I force files to open in the browser instead of downloading (PDF)?

The correct type is application/pdf for PDF, not application/force-download. This looks like a hack for some legacy browsers. Always use the correct mimetype if you can.

If you have control over the server code:

  • Forced download/prompt: use header("Content-Disposition", "attachment; filename=myfilename.myextension");
  • Browser tries to open it: use header("Content-Disposition", "inline; filename=myfilename.myextension");

No control over the server code:

NOTE: I prefer setting the filename on the server side as you may have more information and can use common code.

ViewPager PagerAdapter not updating the View

1.First you have to set the getItemposition method in your Pageradapter class 2.You have to read the Exact position of your View Pager 3.then send that position as data location of your new one 4.Write update button onclick listener inside the setonPageChange listener

that program code is little bit i modified to set the particular position element only

public class MyActivity extends Activity {

private ViewPager myViewPager;
private List<String> data;
public int location=0;
public Button updateButton;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    data = new ArrayList<String>();
    data.add("A");
    data.add("B");
    data.add("C");
    data.add("D");
    data.add("E");
    data.add("F");

    myViewPager = (ViewPager) findViewById(R.id.pager);
    myViewPager.setAdapter(new MyViewPagerAdapter(this, data));

      updateButton = (Button) findViewById(R.id.update);

    myViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int i, float v, int i2) {
             //Toast.makeText(MyActivity.this, i+"  Is Selected  "+data.size(), Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onPageSelected( int i) {
          // here you will get the position of selected page
            final int k = i;
             updateViewPager(k);

        }

        @Override
        public void onPageScrollStateChanged(int i) {

        }
    });
}

private void updateViewPager(final int i) {  
    updateButton.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            Toast.makeText(MyActivity.this, i+"  Is Selected  "+data.size(), Toast.LENGTH_SHORT).show();
            data.set(i, "Replaced "+i);         
            myViewPager.getAdapter().notifyDataSetChanged();
        }
    });

}

private class MyViewPagerAdapter extends PagerAdapter {

    private List<String> data;
    private Context ctx;

    public MyViewPagerAdapter(Context ctx, List<String> data) {
        this.ctx = ctx;
        this.data = data;
    }

    @Override
    public int getCount() {
        return data.size();
    }

    @Override
    public int getItemPosition(Object object) {
        return POSITION_NONE;
    }

    @Override
    public Object instantiateItem(View collection, int position) {          

        TextView view = new TextView(ctx);
        view.setText(data.get(position));
        ((ViewPager)collection).addView(view);            
        return view;
    }

    @Override
    public void destroyItem(View collection, int position, Object view) {
         ((ViewPager) collection).removeView((View) view);
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }

    @Override
    public Parcelable saveState() {
        return null;
    }

    @Override
    public void restoreState(Parcelable arg0, ClassLoader arg1) {
    }

    @Override
    public void startUpdate(View arg0) {
    }

    @Override
    public void finishUpdate(View arg0) {
    }
}
}

How to go to each directory and execute a command?

for p in [0-9][0-9][0-9];do
    (
        cd $p
        for f in [0-9][0-9][0-9][0-9]*.txt;do
            ls $f; # Your operands
        done
    )
done

How to round a number to significant figures in Python

%g in string formatting will format a float rounded to some number of significant figures. It will sometimes use 'e' scientific notation, so convert the rounded string back to a float then through %s string formatting.

>>> '%s' % float('%.1g' % 1234)
'1000'
>>> '%s' % float('%.1g' % 0.12)
'0.1'
>>> '%s' % float('%.1g' % 0.012)
'0.01'
>>> '%s' % float('%.1g' % 0.062)
'0.06'
>>> '%s' % float('%.1g' % 6253)
'6000.0'
>>> '%s' % float('%.1g' % 1999)
'2000.0'

Passing Multiple route params in Angular2

OK realized a mistake .. it has to be /:id/:id2

Anyway didn't find this in any tutorial or other StackOverflow question.

@RouteConfig([{path: '/component/:id/:id2',name: 'MyCompB', component:MyCompB}])
export class MyCompA {
    onClick(){
        this._router.navigate( ['MyCompB', {id: "someId", id2: "another ID"}]);
    }
}

Can "list_display" in a Django ModelAdmin display attributes of ForeignKey fields?

I prefer this:

class CoolAdmin(admin.ModelAdmin):
    list_display = ('pk', 'submodel__field')

    @staticmethod
    def submodel__field(obj):
        return obj.submodel.field

Javascript Object push() function

Objects does not support push property, but you can save it as well using the index as key,

_x000D_
_x000D_
var tempData = {};_x000D_
for ( var index in data ) {_x000D_
  if ( data[index].Status == "Valid" ) { _x000D_
    tempData[index] = data; _x000D_
  } _x000D_
 }_x000D_
data = tempData;
_x000D_
_x000D_
_x000D_

I think this is easier if remove the object if its status is invalid, by doing.

_x000D_
_x000D_
for(var index in data){_x000D_
  if(data[index].Status == "Invalid"){ _x000D_
    delete data[index]; _x000D_
  } _x000D_
}
_x000D_
_x000D_
_x000D_

And finally you don't need to create a var temp –

JavaScript Extending Class

I can propose one variant, just have read in book, it seems the simplest:

function Parent() { 
  this.name = 'default name';
};

function Child() {
  this.address = '11 street';
};

Child.prototype = new Parent();      // child class inherits from Parent
Child.prototype.constructor = Child; // constructor alignment

var a = new Child(); 

console.log(a.name);                // "default name" trying to reach property of inherited class

Return Max Value of range that is determined by an Index & Match lookup

You can easily change the match-type to 1 when you are looking for the greatest value or to -1 when looking for the smallest value.

How to set up subdomains on IIS 7

If your computer can't find the IP address associated with SUBDOMAIN1.example.COM, it will not find the site.

You need to either change your hosts file (so you can at least test things - this will be a local change, only available to yourself), or update DNS so the name will resolve correctly (so the rest of the world can see it).

The APR based Apache Tomcat Native library was not found on the java.library.path

not found on the java.library.path: /usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib

The native lib is expected in one of the following locations

/usr/java/packages/lib/amd64
/usr/lib64
/lib64
/lib
/usr/lib

and not in

tomcat/lib

The files in tomcat/lib are all jar file and are added by tomcat to the classpath so that they are available to your application.

The native lib is needed by tomcat to perform better on the platform it is installed on and thus cannot be a jar, for linux it could be a .so file, for windows it could be a .dll file.

Just download the native library for your platform and place it in the one of the locations tomcat is expecting it to be.

Note that you are not required to have this lib for development/test purposes. Tomcat runs just fine without it.

org.apache.catalina.startup.Catalina start INFO: Server startup in 2882 ms

EDIT

The output you are getting is very normal, it's just some logging outputs from tomcat, the line right above indicates that the server correctly started and is ready for operating.

If you are troubling with running your servlet then after the run on sever command eclipse opens a browser window (embeded (default) or external, depends on your config). If nothing shows on the browser, then check the url bar of the browser to see whether your servlet was requested or not.

It should be something like that

http://localhost:8080/<your-context-name>/<your-servlet-name>

EDIT 2

Try to call your servlet using the following url

http://localhost:8080/com.filecounter/FileCounter

Also each web project has a web.xml, you can find it in your project under WebContent\WEB-INF.

It is better to configure your servlets there using servlet-name servlet-class and url-mapping. It could look like that:

  <servlet>
    <description></description>
    <display-name>File counter - My first servlet</display-name>
    <servlet-name>file_counter</servlet-name>
    <servlet-class>com.filecounter.FileCounter</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>file_counter</servlet-name>
    <url-pattern>/FileFounter</url-pattern>
  </servlet-mapping>

In eclipse dynamic web project the default context name is the same as your project name.

http://localhost:8080/<your-context-name>/FileCounter

will work too.

Why "net use * /delete" does not work but waits for confirmation in my PowerShell script?

Try this:

net use * /delete /y

The /y key makes it select Yes in prompt silently

How to retrieve inserted id after inserting row in SQLite using Python?

All credits to @Martijn Pieters in the comments:

You can use the function last_insert_rowid():

The last_insert_rowid() function returns the ROWID of the last row insert from the database connection which invoked the function. The last_insert_rowid() SQL function is a wrapper around the sqlite3_last_insert_rowid() C/C++ interface function.

What’s the difference between “{}” and “[]” while declaring a JavaScript array?

Nobody seems to be explaining the difference between an array and an object.

[] is declaring an array.

{} is declaring an object.

An array has all the features of an object with additional features (you can think of an array like a sub-class of an object) where additional methods and capabilities are added in the Array sub-class. In fact, typeof [] === "object" to further show you that an array is an object.

The additional features consist of a magic .length property that keeps track of the number of items in the array and a whole slew of methods for operating on the array such as .push(), .pop(), .slice(), .splice(), etc... You can see a list of array methods here.

An object gives you the ability to associate a property name with a value as in:

var x = {};
x.foo = 3;
x["whatever"] = 10;
console.log(x.foo);      // shows 3
console.log(x.whatever); // shows 10

Object properties can be accessed either via the x.foo syntax or via the array-like syntax x["foo"]. The advantage of the latter syntax is that you can use a variable as the property name like x[myvar] and using the latter syntax, you can use property names that contain characters that Javascript won't allow in the x.foo syntax.

A property name can be any string value.


An array is an object so it has all the same capabilities of an object plus a bunch of additional features for managing an ordered, sequential list of numbered indexes starting from 0 and going up to some length. Arrays are typically used for an ordered list of items that are accessed by numerical index. And, because the array is ordered, there are lots of useful features to manage the order of the list .sort() or to add or remove things from the list.

Change Bootstrap tooltip color

This is already been answered right but i think i should give my opinion too. Like cozen says this is a border, and for it to work you must specify the classes to format this in the same way that bootstrap specifies it. So, you can do this

.tooltip .tooltip-inner {background-color: #00a8c4; color: black;} 
.tooltip.top .tooltip-arrow {border-top-color: #00a8c4;}

or you can do the next one, just for the tooltip-arrow but you must add the !important, so that it overwrites the bootstrap css

.tooltip-arrow {border-top-color: #00a8c4!important;}

How to display an image stored as byte array in HTML/JavaScript?

Try putting this HTML snippet into your served document:

<img id="ItemPreview" src="">

Then, on JavaScript side, you can dynamically modify image's src attribute with so-called Data URL.

document.getElementById("ItemPreview").src = "data:image/png;base64," + yourByteArrayAsBase64;

Alternatively, using jQuery:

$('#ItemPreview').attr('src', `data:image/png;base64,${yourByteArrayAsBase64}`);

This assumes that your image is stored in PNG format, which is quite popular. If you use some other image format (e.g. JPEG), modify the MIME type ("image/..." part) in the URL accordingly.

Similar Questions:

How do I remove newlines from a text file?

Was having the same case today, super easy in vim or nvim, you can use gJ to join lines. For your use case, just do

99gJ

this will join all your 99 lines. You can adjust the number 99 as need according to how many lines to join. If just join 1 line, then only gJ is good enough.

How can I get the current user directory?

Messing around with environment variables or hard-coded parent folder offsets is never a good idea when there is a API to get the info you want, call SHGetSpecialFolderPath(...,CSIDL_PROFILE,...)

How to run a jar file in a linux commandline

copy your file in linux Java directory

cp yourfile.jar /java/bin

open the directory

cd /java/bin

and execute your file

./java -jar yourfile.jar

or all in one try this command:

/java/bin/java -jar jarfilefolder/jarfile.jar

sql use statement with variable

You can do this:

Declare @dbName nvarchar(max);
SET @dbName = 'TESTDB';

Declare @SQL nvarchar(max);
select @SQL = 'USE ' + @dbName +'; {can put command(s) here}';
EXEC (@SQL);

{but not here!}

This means you can do a recursive select like the following:

Declare @dbName nvarchar(max);
SET @dbName = 'TESTDB';
Declare @SQL nvarchar(max);

SELECT @SQL = 'USE ' + @dbName + '; ' +(Select ... {query here}
For XML Path(''),Type)
.value('text()[1]','nvarchar(max)');

Exec (@SQL)

Java error: Comparison method violates its general contract

It might also be an OpenJDK bug... (not in this case but it is the same error)

If somebody like me stumbles upon this answer regarding the

java.lang.IllegalArgumentException: Comparison method violates its general contract!

then it might also be a bug in the Java-Version. I have a compareTo running since several years now in some applications. But suddenly it stopped working and throws the error after all compares were done (i compare 6 Attributes before returning "0").

Now I just found this Bugreport of OpenJDK:

Disable Button in Angular 2

I tried use [disabled]="!editmode" but it not work in my case.

This is my solution [disabled]="!editmode ? 'disabled': null" , I share for whom concern.

<button [disabled]="!editmode ? 'disabled': null" 
    (click)='loadChart()'>
            <div class="btn-primary">Load Chart</div>
    </button>

Stackbliz https://stackblitz.com/edit/angular-af55ep

Static array vs. dynamic array in C++

I think in this context it means it is static in the sense that the size is fixed. Use std::vector. It has a resize() function.

How to remove all white space from the beginning or end of a string?

use the String.Trim() function.

string foo = "   hello ";
string bar = foo.Trim();

Console.WriteLine(bar); // writes "hello"

How to disable Compatibility View in IE

All you need is to force disable C.M. in IE - Just paste This code (in IE9 and under c.m. will be disabled):

<meta http-equiv="X-UA-Compatible" content="IE=9; IE=8; IE=7; IE=EDGE" />

Source: http://twigstechtips.blogspot.com/2010/03/css-ie8-meta-tag-to-disable.html

A full list of all the new/popular databases and their uses?

The SQLite database engine

With library for most popular languages

  • .Net
  • perl
  • Feel free to edit this and add more links

Is there a way to iterate over a dictionary?

Yes, NSDictionary supports fast enumeration. With Objective-C 2.0, you can do this:

// To print out all key-value pairs in the NSDictionary myDict
for(id key in myDict)
    NSLog(@"key=%@ value=%@", key, [myDict objectForKey:key]);

The alternate method (which you have to use if you're targeting Mac OS X pre-10.5, but you can still use on 10.5 and iPhone) is to use an NSEnumerator:

NSEnumerator *enumerator = [myDict keyEnumerator];
id key;
// extra parens to suppress warning about using = instead of ==
while((key = [enumerator nextObject]))
    NSLog(@"key=%@ value=%@", key, [myDict objectForKey:key]);

How to change text color of simple list item

If you want to keep all the style but change few details, you can use the default style defined on the Android and change what you want

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/text1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceListItemSmall"
    android:gravity="center_vertical"
    android:textColor="@android:color/background_light"
    android:paddingStart="?android:attr/listPreferredItemPaddingStart"
    android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
    android:background="?android:attr/activatedBackgroundIndicator"
    android:minHeight="?android:attr/listPreferredItemHeightSmall" />

Then set the adapter using:

setListAdapter(new ArrayAdapter<String>(getApplicationContext(),
            R.layout.list_item_custom, mStringList));

Source: https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/core/res/res/layout/simple_list_item_activated_1.xml

Position an element relative to its container

You have to explicitly set the position of the parent container along with the position of the child container. The typical way to do that is something like this:

div.parent{
    position: relative;
    left: 0px;  /* stick it wherever it was positioned by default */
    top: 0px;
}

div.child{
    position: absolute;
    left: 10px;
    top: 10px;
}

Create a HTML table where each TR is a FORM

I had a problem similar to the one posed in the original question. I was intrigued by the divs styled as table elements (didn't know you could do that!) and gave it a run. However, my solution was to keep my tables wrapped in tags, but rename each input and select option to become the keys of array, which I'm now parsing to get each element in the selected row.

Here's a single row from the table. Note that key [4] is the rendered ID of the row in the database from which this table row was retrieved:

<table>
  <tr>
    <td>DisabilityCategory</td>
    <td><input type="text" name="FormElem[4][ElemLabel]" value="Disabilities"></td>
    <td><select name="FormElem[4][Category]">
        <option value="1">General</option>
        <option value="3">Disability</option>
        <option value="4">Injury</option>
        <option value="2"selected>School</option>
        <option value="5">Veteran</option>
        <option value="10">Medical</option>
        <option value="9">Supports</option>
        <option value="7">Residential</option>
        <option value="8">Guardian</option>
        <option value="6">Criminal</option>
        <option value="11">Contacts</option>
      </select></td>
    <td>4</td>
    <td style="text-align:center;"><input type="text" name="FormElem[4][ElemSeq]" value="0" style="width:2.5em; text-align:center;"></td>
    <td>'ccpPartic'</td>
    <td><input type="text" name="FormElem[4][ElemType]" value="checkbox"></td>
    <td><input type="checkbox" name="FormElem[4][ElemRequired]"></td>
    <td><input type="text" name="FormElem[4][ElemLabelPrefix]" value=""></td>
    <td><input type="text" name="FormElem[4][ElemLabelPostfix]" value=""></td>
    <td><input type="text" name="FormElem[4][ElemLabelPosition]" value="before"></td>
    <td><input type="submit" name="submit[4]" value="Commit Changes"></td>
  </tr>
</table>

Then, in PHP, I'm using the following method to store in an array ($SelectedElem) each of the elements in the row corresponding to the submit button. I'm using print_r() just to illustrate:

$SelectedElem = implode(",", array_keys($_POST['submit']));
print_r ($_POST['FormElem'][$SelectedElem]);

Perhaps this sounds convoluted, but it turned out to be quite simple, and it preserved the organizational structure of the table.

How to retrieve the last autoincremented ID from a SQLite table?

With SQL Server you'd SELECT SCOPE_IDENTITY() to get the last identity value for the current process.

With SQlite, it looks like for an autoincrement you would do

SELECT last_insert_rowid()

immediately after your insert.

http://www.mail-archive.com/[email protected]/msg09429.html

In answer to your comment to get this value you would want to use SQL or OleDb code like:

using (SqlConnection conn = new SqlConnection(connString))
{
    string sql = "SELECT last_insert_rowid()";
    SqlCommand cmd = new SqlCommand(sql, conn);
    conn.Open();
    int lastID = (Int32) cmd.ExecuteScalar();
}

Get current time in seconds since the Epoch on Linux, Bash

So far, all the answers use the external program date.

Since Bash 4.2, printf has a new modifier %(dateformat)T that, when used with argument -1 outputs the current date with format given by dateformat, handled by strftime(3) (man 3 strftime for informations about the formats).

So, for a pure Bash solution:

printf '%(%s)T\n' -1

or if you need to store the result in a variable var:

printf -v var '%(%s)T' -1

No external programs and no subshells!

Since Bash 4.3, it's even possible to not specify the -1:

printf -v var '%(%s)T'

(but it might be wiser to always give the argument -1 nonetheless).

If you use -2 as argument instead of -1, Bash will use the time the shell was started instead of the current date. This can be used to compute elapsed times

$ printf -v beg '%(%s)T\n' -2
$ printf -v now '%(%s)T\n' -1
$ echo beg=$beg now=$now elapsed=$((now-beg))
beg=1583949610 now=1583953032 elapsed=3422

Jenkins "Console Output" log location in filesystem

Jenkins stores the console log on master. If you want programmatic access to the log, and you are running on master, you can access the log that Jenkins already has, without copying it to the artifacts or having to GET the http job URL.

From http://javadoc.jenkins.io/archive/jenkins-1.651/hudson/model/Run.html#getLogFile(), this returns the File object for the console output (in the jenkins file system, this is the "log" file in the build output directory).

In my case, we use a chained (child) job to do parsing and analysis on a parent job's build.

When using a groovy script run in Jenkins, you get an object named "build" for the run. We use this to get the http://javadoc.jenkins.io/archive/jenkins-1.651/hudson/model/Build.html for the upstream job, then call this job's .getLogFile().

Added bonus; since it's just a File object, we call .getParent() to get the folder where Jenkins stores build collateral (like test xmls, environment variables, and other things that may not be explicitly exposed through the artifacts) which we can also parse.

Double added bonus; we also use matrix jobs. This sometimes makes inferring the file path on the system a pain. .getLogFile().getParent() takes away all the pain.

How to show the text on a ImageButton?

You can use a LinearLayout instead of using Button it's an arrangement i used in my app

 <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:background="@color/mainColor"
        android:orientation="horizontal"
        android:padding="10dp">

        <ImageView
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:background="@drawable/ic_cv"
            android:textColor="@color/offBack"
            android:textSize="20dp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:text="@string/cartyCv"
            android:textColor="@color/offBack"
            android:textSize="25dp" />

    </LinearLayout>

Use NSInteger as array index

According to the error message, you declared myLoc as a pointer to an NSInteger (NSInteger *myLoc) rather than an actual NSInteger (NSInteger myLoc). It needs to be the latter.

how to use python2.7 pip instead of default pip

There should be a binary called "pip2.7" installed at some location included within your $PATH variable.

You can find that out by typing

which pip2.7

This should print something like '/usr/local/bin/pip2.7' to your stdout. If it does not print anything like this, it is not installed. In that case, install it by running

$ wget https://bootstrap.pypa.io/get-pip.py
$ sudo python2.7 get-pip.py

Now, you should be all set, and

which pip2.7

should return the correct output.

Is there a way to add/remove several classes in one single instruction with classList?

I liked @rich.kelly's answer, but I wanted to use the same nomenclature as classList.add() (comma seperated strings), so a slight deviation.

DOMTokenList.prototype.addMany = DOMTokenList.prototype.addMany || function() {
  for (var i = 0; i < arguments.length; i++) {
    this.add(arguments[i]);
  }
}
DOMTokenList.prototype.removeMany = DOMTokenList.prototype.removeMany || function() {
  for (var i = 0; i < arguments.length; i++) {
    this.remove(arguments[i]);
  }
}

So you can then use:

document.body.classList.addMany('class-one','class-two','class-three');

I need to test all browsers, but this worked for Chrome.
Should we be checking for something more specific than the existence of DOMTokenList.prototype.addMany? What exactly causes classList.add() to fail in IE11?

Can a table row expand and close?

Well, I'd say use the DIV instead of table as it would be much easier (but there's nothing wrong with using tables).

My approach would be to use jQuery.ajax and request more data from server and that way, the selected DIV (or TD if you use table) will automatically expand based on requested content.

That way, it saves bandwidth and makes it go faster as you don't load all content at once. It loads only when it's selected.

SSRS chart does not show all labels on Horizontal axis

It looks as though the horizontal axis (Category Group) labels have very long values - there may not be room to display them all. I suggest changing the labels to have shorter values.

You can set the sort order for the Category Groups in the Category Group Properties - Sorting section - this may have been previously set; if not, I suggest using this to sort as desired.

How to change colour of blue highlight on select box dropdown

i just found this site that give a cool themes for the select box http://gregfranko.com/jquery.selectBoxIt.js/

and you can try this themes if your problem with the overall look blue - yellow - grey

How can I remove a child node in HTML using JavaScript?

Modern Solution - child.remove()

For your use case:

document.getElementById("FirstDiv").remove()

This is recommended by W3C since late 2015, and is vanilla JS. All major browsers support it.

Mozilla Docs

Supported Browsers - 96% May 2020

Any way (or shortcut) to auto import the classes in IntelliJ IDEA like in Eclipse?

Can't import all at once but can use following combination:

ALT + Enter --> Show intention actions and quick-fixes.

F2 --> Next highlighted error.

How do I get current URL in Selenium Webdriver 2 Python?

Use current_url element for Python 2:

print browser.current_url

For Python 3 and later versions of selenium:

print(driver.current_url)

Add to python path mac os x

Not sure why Matthew's solution didn't work for me (could be that I'm using OSX10.8 or perhaps something to do with macports). But I added the following to the end of the file at ~/.profile

export PYTHONPATH=/path/to/dir:$PYTHONPATH

my directory is now on the pythonpath -

my-macbook:~ aidan$ python
Python 2.7.2 (default, Jun 20 2012, 16:23:33) 
[GCC 4.2.1 Compatible Apple Clang 4.0 (tags/Apple/clang-418.0.60)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.path
['', '/path/to/dir', ...  

and I can import modules from that directory.

Linq on DataTable: select specific column into datatable, not whole table

Here I get only three specific columns from mainDataTable and use the filter

DataTable checkedParams = mainDataTable.Select("checked = true").CopyToDataTable()
.DefaultView.ToTable(false, "lagerID", "reservePeriod", "discount");

fileReader.readAsBinaryString to upload files

Use fileReader.readAsDataURL( fileObject ), this will encode it to base64, which you can safely upload to your server.

Create a map with clickable provinces/states using SVG, HTML/CSS, ImageMap

Go to SVG to Script with your SVG the default output is the map in SVG Code which adds events is also added but is easily identified and can be altered as required.

Android ViewPager with bottom dots

I thought of posting a simpler solution for the above problem and indicator numbers can be dynamically changed with only changing one variable value dotCounts=x what I did goes like this.

1) Create an xml file in drawable folder for page selected indicator named "item_selected".

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval" android:useLevel="true"
    android:dither="true">
    <size android:height="8dp" android:width="8dp"/>
    <solid android:color="@color/image_item_selected_for_dots"/>
</shape>

2) Create one more xml file for unselected indicator named "item_unselected"

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval" android:useLevel="true"
    android:dither="true">

    <size android:height="8dp" android:width="8dp"/>

    <solid android:color="@color/image_item_unselected_for_dots"/>
</shape>

3) Now add add this part of the code at the place where you want to display the indicators for ex below viewPager in your Layout XML file.

 <RelativeLayout
        android:id="@+id/viewPagerIndicator"
        android:layout_width="match_parent"
        android:layout_below="@+id/banner_pager"
        android:layout_height="wrap_content"
        android:gravity="center">

        <LinearLayout
            android:id="@+id/viewPagerCountDots"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_centerHorizontal="true"
            android:gravity="center"
            android:orientation="horizontal" />
        </RelativeLayout>

4) Add this function on top of your activity file file where your layout is inflated or the above xml file is related to

private int dotsCount=5;    //No of tabs or images
private ImageView[] dots;
LinearLayout linearLayout;

private void drawPageSelectionIndicators(int mPosition){
    if(linearLayout!=null) {
        linearLayout.removeAllViews();
    }
    linearLayout=(LinearLayout)findViewById(R.id.viewPagerCountDots);
    dots = new ImageView[dotsCount];
    for (int i = 0; i < dotsCount; i++) {
        dots[i] = new ImageView(context);
        if(i==mPosition)
            dots[i].setImageDrawable(getResources().getDrawable(R.drawable.item_selected));
        else
            dots[i].setImageDrawable(getResources().getDrawable(R.drawable.item_unselected));

        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT,
                LinearLayout.LayoutParams.WRAP_CONTENT
        );

        params.setMargins(4, 0, 4, 0);
        linearLayout.addView(dots[i], params);
    }
}

5) Finally in your onCreate method add the following code to reference your layout and handle pageselected positions

drawPageSelectionIndicators(0);
mPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
    }

    @Override
    public void onPageSelected(int position) {
        drawPageSelectionIndicators(position);
    }

    @Override
    public void onPageScrollStateChanged(int state) {
    }
});

How Can I Resolve:"can not open 'git-upload-pack' " error in eclipse?

This is a quite old post, but:

  • never oh never disable ssl verify as suggested in some answers

  • if you want to stick with https:

    1. retrieve add your git server certificate (using firefox for example)
    2. add it to your java keystore. See https://stackoverflow.com/a/27928213/5423781

MySQL maximum memory usage

mysqld.exe was using 480 mb in RAM. I found that I added this parameter to my.ini

table_definition_cache = 400

that reduced memory usage from 400,000+ kb down to 105,000kb

How to subtract 30 days from the current date using SQL Server

SELECT DATEADD(day,-30,date) AS before30d 
FROM...

But it is strongly recommended to keep date in datetime column, not varchar.

How do I use a regex in a shell script?

I think this is what you want:

REGEX_DATE='^\d{2}[/-]\d{2}[/-]\d{4}$'

echo "$1" | grep -P -q $REGEX_DATE
echo $?

I've used the -P switch to get perl regex.

How to set background color of a View

I use at API min 16 , target 23

Button WeekDoneButton = (Button) viewWeeklyTimetable.findViewById(R.id.week_done_button);

WeekDoneButton.setBackgroundColor(ContextCompat.getColor(getActivity(), R.color.colorAccent));

Unclosed Character Literal error

Java uses double quotes for "String" and single quotes for 'C'haracters.

Easily measure elapsed time

Windows only: (The Linux tag was added after I posted this answer)

You can use GetTickCount() to get the number of milliseconds that have elapsed since the system was started.

long int before = GetTickCount();

// Perform time-consuming operation

long int after = GetTickCount();

How to convert a Java 8 Stream to an Array?

The easiest method is to use the toArray(IntFunction<A[]> generator) method with an array constructor reference. This is suggested in the API documentation for the method.

String[] stringArray = stringStream.toArray(String[]::new);

What it does is find a method that takes in an integer (the size) as argument, and returns a String[], which is exactly what (one of the overloads of) new String[] does.

You could also write your own IntFunction:

Stream<String> stringStream = ...;
String[] stringArray = stringStream.toArray(size -> new String[size]);

The purpose of the IntFunction<A[]> generator is to convert an integer, the size of the array, to a new array.

Example code:

Stream<String> stringStream = Stream.of("a", "b", "c");
String[] stringArray = stringStream.toArray(size -> new String[size]);
Arrays.stream(stringArray).forEach(System.out::println);

Prints:

a
b
c

Spring Boot application can't resolve the org.springframework.boot package

This answer may be out of topic for most of readers. In my case the dependency didn't update and "mvn clean" didn't work since my wifi network at the office is highly securised, leaving a "connection timed out". (same respect github pushes and pulls don't work) I just moved to teathering with my phone and it works. Stupid, out of topic for most, but it may help some very specific cases.

C++ int float casting

When doing integer division, the result will always be a integer unless one or more of the operands are a float. Just type cast one/both of the operands to a float and the compiler will do the conversion. Type casting is used when you want the arithmetic to perform as it should so the result will be the correct data type.

float m = static_cast<float>(a.y - b.y) / (a.x - b.x);

Calculating sum of repeated elements in AngularJS ng-repeat

here is my solution to this problem:

<td>Total: {{ calculateTotal() }}</td>

script

$scope.calculateVAT = function () {
    return $scope.cart.products.reduce((accumulator, currentValue) => accumulator + (currentValue.price * currentValue.quantity), 0);
};

reduce will execute for each product in products array. Accumulator is the total accumulated amount, currentValue is the current element of the array and the 0 in the last is the initial value

How can I create a blank/hardcoded column in a sql query?

For varchars, you may need to do something like this:

select convert(varchar(25), NULL) as abc_column into xyz_table

If you try

select '' as abc_column into xyz_table

you may get errors related to truncation, or an issue with null values, once you populate.

Use a URL to link to a Google map with a marker on it

In May 2017 Google launched the official Google Maps URLs documentation. The Google Maps URLs introduces universal cross-platform syntax that you can use in your applications.

Have a look at the following document:

https://developers.google.com/maps/documentation/urls/guide

You can use URLs in search, directions, map and street view modes.

For example, to show the marker at specified position you can use the following URL:

https://www.google.com/maps/search/?api=1&query=36.26577,-92.54324

For further details please read aforementioned documentation.

You can also file feature requests for this API in Google issue tracker.

Hope this helps!

AngularJS - Building a dynamic table based on a json

TGrid is another option that people don't usually find in a google search. If the other grids you find don't suit your needs, you can give it a try, its free

How do I set a checkbox in razor view?

You can do this with @Html.CheckBoxFor():

@Html.CheckBoxFor(m => m.AllowRating, new{@checked=true });

or you can also do this with a simple @Html.CheckBox():

@Html.CheckBox("AllowRating", true) ;

Could not find default endpoint element

I've had this same issue. It turns out that for a web REFERENCE, you have to supply the URL as the first parameter to the constructor:

new WebService.WebServiceSoapClient("http://myservice.com/moo.aspx");

For a new style web SERVICE REFERENCE, you have to supply a name that refers to an endpoint entry in the configuration:

new WebService.WebServiceSoapClient("WebServiceEndpoint");

With a corresponding entry in Web.config or App.config:

<client>
      <endpoint address="http://myservice.com/moo.aspx"
        binding="basicHttpBinding" 
        bindingConfiguration="WebService"
        contract="WebService.WebServiceSoap"
        name="WebServiceEndpoint" />
    </client>
  </system.serviceModel>

Pretty damn hard to remove the tunnel vision on "it worked in an older program"...

How do I set the selected item in a comboBox to match my string using C#?

I've used an extension method:

public static void SelectItemByValue(this ComboBox cbo, string value)
{
    for(int i=0; i < cbo.Items.Count; i++)
    {
        var prop = cbo.Items[i].GetType().GetProperty(cbo.ValueMember);
        if (prop!=null && prop.GetValue(cbo.Items[i], null).ToString() == value)
        {
             cbo.SelectedIndex = i;
             break;
        }
    } 
}

Then just consume the method:

ddl.SelectItemByValue(value);

Install specific version using laravel installer

you can find all version install code here by changing the version of laravel doc

composer create-project --prefer-dist laravel/laravel yourProjectName "5.1.*"

above code for creating laravel 5.1 version project. see more in laravel doc. happy coding!!

How can I get enum possible values in a MySQL database?

For Laravel this worked:

$result = DB::select("SHOW COLUMNS FROM `table_name` LIKE 'status';");
$regex = "/'(.*?)'/";
preg_match_all( $regex , $result[0]->Type, $enum_array );
$enum_fields = $enum_array[1];
echo "<pre>";
print_r($enum_fields);

Output:

Array
(
[0] => Requested
[1] => Call Back
[2] => Busy
[3] => Not Reachable
[4] => Not Responding
)

What is the single most influential book every programmer should read?

When I first started, there was "Mastering Turbo Pascal" by Tom Swan. There is nothing terribly profound about this book. It was clear and concise with usable examples. Based on this knowledge, I spawned a software development career now 15+ years in.

What are the most-used vim commands/keypresses?

Go to Efficient Editing with vim and learn what you need to get started. Not everything on that page is essential starting off, so cherry pick what you want.

From there, use vim for everything. "hjkl", "y", and "p" will get you a long way, even if it's not the most efficient way. When you come up against a task for which you don't know the magic key to do it efficiently (or at all), and you find yourself doing it more than a few times, go look it up. Little by little it will become second nature.

I found vim daunting many moons ago (back when it didn't have the "m" on the end), but it only took about a week of steady use to get efficient. I still find it the quickest editor in which to get stuff done.

SQL ON DELETE CASCADE, Which Way Does the Deletion Occur?

Cascade will work when you delete something on table Courses. Any record on table BookCourses that has reference to table Courses will be deleted automatically.

But when you try to delete on table BookCourses only the table itself is affected and not on the Courses

follow-up question: why do you have CourseID on table Category?

Maybe you should restructure your schema into this,

CREATE TABLE Categories 
(
  Code CHAR(4) NOT NULL PRIMARY KEY,
  CategoryName VARCHAR(63) NOT NULL UNIQUE
);

CREATE TABLE Courses 
(
  CourseID INT NOT NULL PRIMARY KEY,
  BookID INT NOT NULL,
  CatCode CHAR(4) NOT NULL,
  CourseNum CHAR(3) NOT NULL,
  CourseSec CHAR(1) NOT NULL,
);

ALTER TABLE Courses
ADD FOREIGN KEY (CatCode)
REFERENCES Categories(Code)
ON DELETE CASCADE;

Java, How to implement a Shift Cipher (Caesar Cipher)

Java Shift Caesar Cipher by shift spaces.

Restrictions:

  1. Only works with a positive number in the shift parameter.
  2. Only works with shift less than 26.
  3. Does a += which will bog the computer down for bodies of text longer than a few thousand characters.
  4. Does a cast number to character, so it will fail with anything but ascii letters.
  5. Only tolerates letters a through z. Cannot handle spaces, numbers, symbols or unicode.
  6. Code violates the DRY (don't repeat yourself) principle by repeating the calculation more than it has to.

Pseudocode:

  1. Loop through each character in the string.
  2. Add shift to the character and if it falls off the end of the alphabet then subtract shift from the number of letters in the alphabet (26)
  3. If the shift does not make the character fall off the end of the alphabet, then add the shift to the character.
  4. Append the character onto a new string. Return the string.

Function:

String cipher(String msg, int shift){
    String s = "";
    int len = msg.length();
    for(int x = 0; x < len; x++){
        char c = (char)(msg.charAt(x) + shift);
        if (c > 'z')
            s += (char)(msg.charAt(x) - (26-shift));
        else
            s += (char)(msg.charAt(x) + shift);
    }
    return s;
}

How to invoke it:

System.out.println(cipher("abc", 3));  //prints def
System.out.println(cipher("xyz", 3));  //prints abc

Assert that a WebElement is not present using Selenium WebDriver with java

boolean titleTextfield = driver.findElement(By.id("widget_polarisCommunityInput_113_title")).isDisplayed();
assertFalse(titleTextfield, "Title text field present which is not expected");

SQL string value spanning multiple lines in query

with your VARCHAR, you may also need to specify the length, or its usually good to

What about grabbing the text, making a sting of it, then putting it into the query witrh

String TableName = "ComplicatedTableNameHere";  
EditText editText1 = (EditText) findViewById(R.id.EditTextIDhere); 
String editTextString1 = editText1.getText().toString();  

BROKEN DOWN

String TableName = "ComplicatedTableNameHere";            
    //sets the table name as a string so you can refer to TableName instead of writing out your table name everytime

EditText editText1 = (EditText) findViewById(R.id.EditTextIDhere); 
    //gets the text from your edit text fieldfield 
    //editText1 = your edit text name
    //EditTextIDhere = the id of your text field

String editTextString1 = editText1.getText().toString();  
    //sets the edit text as a string
    //editText1 is the name of the Edit text from the (EditText) we defined above
    //editTextString1 = the string name you will refer to in future

then use

       /* Insert data to a Table*/
       myDB.execSQL("INSERT INTO "
         + TableName
         + " (Column_Name, Column_Name2, Column_Name3, Column_Name4)"
         + " VALUES ( "+EditTextString1+", 'Column_Value2','Column_Value3','Column_Value4');");

Hope this helps some what...

NOTE each string is within

'"+stringname+"'

its the 'and' that enable the multi line element of the srting, without it you just get the first line, not even sure if you get the whole line, it may just be the first word

How to add to the PYTHONPATH in Windows, so it finds my modules/packages?

You know what has worked for me really well on windows.

My Computer > Properties > Advanced System Settings > Environment Variables >

Just add the path as C:\Python27 (or wherever you installed python)

OR

Then under system variables I create a new Variable called PythonPath. In this variable I have C:\Python27\Lib;C:\Python27\DLLs;C:\Python27\Lib\lib-tk;C:\other-folders-on-the-path

enter image description here

This is the best way that has worked for me which I hadn't found in any of the docs offered.

EDIT: For those who are not able to get it, Please add

C:\Python27;

along with it. Else it will never work.

VBA macro that search for file in multiple subfolders

Just for fun, here's a sample with a recursive function which (I hope) should be a bit simpler to understand and to use with your code:

Function Recurse(sPath As String) As String

    Dim FSO As New FileSystemObject
    Dim myFolder As Folder
    Dim mySubFolder As Folder

    Set myFolder = FSO.GetFolder(sPath)
    For Each mySubFolder In myFolder.SubFolders
        Call TestSub(mySubFolder.Path)
        Recurse = Recurse(mySubFolder.Path)
    Next

End Function

Sub TestR()

    Call Recurse("D:\Projets\")

End Sub

Sub TestSub(ByVal s As String)

    Debug.Print s

End Sub

Edit: Here's how you can implement this code in your workbook to achieve your objective.

Sub TestSub(ByVal s As String)

    Dim FSO As New FileSystemObject
    Dim myFolder As Folder
    Dim myFile As File

    Set myFolder = FSO.GetFolder(s)
    For Each myFile In myFolder.Files
        If myFile.Name = Range("E1").Value Then
            Debug.Print myFile.Name 'Or do whatever you want with the file
        End If
    Next

End Sub

Here, I just debug the name of the found file, the rest is up to you. ;)

Of course, some would say it's a bit clumsy to call twice the FileSystemObject so you could simply write your code like this (depends on wether you want to compartmentalize or not):

Function Recurse(sPath As String) As String

    Dim FSO As New FileSystemObject
    Dim myFolder As Folder
    Dim mySubFolder As Folder
    Dim myFile As File

    Set myFolder = FSO.GetFolder(sPath)

    For Each mySubFolder In myFolder.SubFolders
        For Each myFile In mySubFolder.Files
            If myFile.Name = Range("E1").Value Then
                Debug.Print myFile.Name & " in " & myFile.Path 'Or do whatever you want with the file
                Exit For
            End If
        Next
        Recurse = Recurse(mySubFolder.Path)
    Next

End Function

Sub TestR()

    Call Recurse("D:\Projets\")

End Sub

Is there an R function for finding the index of an element in a vector?

The function match works on vectors:

x <- sample(1:10)
x
# [1]  4  5  9  3  8  1  6 10  7  2
match(c(4,8),x)
# [1] 1 5

match only returns the first encounter of a match, as you requested. It returns the position in the second argument of the values in the first argument.

For multiple matching, %in% is the way to go:

x <- sample(1:4,10,replace=TRUE)
x
# [1] 3 4 3 3 2 3 1 1 2 2
which(x %in% c(2,4))
# [1]  2  5  9 10

%in% returns a logical vector as long as the first argument, with a TRUE if that value can be found in the second argument and a FALSE otherwise.

Using grep to help subset a data frame in R

You may also use the stringr package

library(dplyr)
library(stringr)
My.Data %>% filter(str_detect(x, '^G45'))

You may not use '^' (starts with) in this case, to obtain the results you need

Connect to Oracle DB using sqlplus

Easy way (using XE):

1). Configure your tnsnames.ora

XE =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = HOST.DOMAIN.COM)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = XE)
    )
  )

You can replace HOST.DOMAIN.COM with IP address, the TCP port by default is 1521 (ckeck it) and look that name of this configuration is XE

2). Using your app named sqlplus:

sqlplus SYSTEM@XE

SYSTEM should be replaced with an authorized USER, and put your password when prompt appear

3). See at firewall for any possibilities of some blocked TCP ports and fix it if appear

Credit card expiration dates - Inclusive or exclusive?

In my experience, it has expired at the end of that month. That is based on the fact that I can use it during that month, and that month is when my bank sends a new one.

How do I change an HTML selected option using JavaScript?

Tools as pure JavaScript code for handling Selectbox:

Graphical Understanding:

Image - A

enter image description here


Image - B

enter image description here


Image - C

enter image description here

Updated - 25-June-2019 | Fiddler DEMO

JavaScript Code:

/**
 * Empty Select Box
 * @param eid Element ID
 * @param value text
 * @param text text
 * @author Neeraj.Singh
 */
function emptySelectBoxById(eid, value, text) {
    document.getElementById(eid).innerHTML = "<option value='" + value + "'>" + text + "</option>";
}


/**
 * Reset Select Box
 * @param eid Element ID
 */

function resetSelectBoxById(eid) {
    document.getElementById(eid).options[0].selected = 'selected';
}


/**
 * Set Select Box Selection By Index
 * @param eid Element ID
 * @param eindx Element Index
 */

function setSelectBoxByIndex(eid, eindx) {
    document.getElementById(eid).getElementsByTagName('option')[eindx].selected = 'selected';
    //or
    document.getElementById(eid).options[eindx].selected = 'selected';
}


/**
 * Set Select Box Selection By Value
 * @param eid Element ID
 * @param eval Element Index
 */
function setSelectBoxByValue(eid, eval) {
    document.getElementById(eid).value = eval;
}


/**
 * Set Select Box Selection By Text
 * @param eid Element ID
 * @param eval Element Index
 */
function setSelectBoxByText(eid, etxt) {
    var eid = document.getElementById(eid);
    for (var i = 0; i < eid.options.length; ++i) {
        if (eid.options[i].text === etxt)
            eid.options[i].selected = true;
    }
}


/**
 * Get Select Box Text By ID
 * @param eid Element ID
 * @return string
 */

function getSelectBoxText(eid) {
    return document.getElementById(eid).options[document.getElementById(eid).selectedIndex].text;
}


/**
 * Get Select Box Value By ID
 * @param eid Element ID
 * @return string
 */

function getSelectBoxValue(id) {
    return document.getElementById(id).options[document.getElementById(id).selectedIndex].value;
}

How to create a MySQL hierarchical recursive query?

Something not mentioned here, although a bit similar to the second alternative of the accepted answer but different and low cost for big hierarchy query and easy (insert update delete) items, would be adding a persistent path column for each item.

some like:

id | name        | path
19 | category1   | /19
20 | category2   | /19/20
21 | category3   | /19/20/21
22 | category4   | /19/20/21/22

Example:

-- get children of category3:
SELECT * FROM my_table WHERE path LIKE '/19/20/21%'
-- Reparent an item:
UPDATE my_table SET path = REPLACE(path, '/19/20', '/15/16') WHERE path LIKE '/19/20/%'

Optimise the path length and ORDER BY path using base36 encoding instead real numeric path id

 // base10 => base36
 '1' => '1',
 '10' => 'A',
 '100' => '2S',
 '1000' => 'RS',
 '10000' => '7PS',
 '100000' => '255S',
 '1000000' => 'LFLS',
 '1000000000' => 'GJDGXS',
 '1000000000000' => 'CRE66I9S'

https://en.wikipedia.org/wiki/Base36

Suppressing also the slash '/' separator by using fixed length and padding to the encoded id

Detailed optimization explanation here: https://bojanz.wordpress.com/2014/04/25/storing-hierarchical-data-materialized-path/

TODO

building a function or procedure to split path for retreive ancestors of one item

LISTAGG function: "result of string concatenation is too long"

We were able to solve a similar issue here using Oracle LISTAGG. There was a point where what we were grouping on exceeded the 4K limit but this was easily solved by having the first dataset take the first 15 items to aggregate, each of which have a 256K limit.

More info: We have projects, which have change orders, which in turn have explanations. Why the database is set up to take change text in chunks of 256K limits is not known but its one of the design constraints. So the application that feeds change explanations into the table stops at 254K and inserts, then gets the next set of text and if > 254K generates another row, etc. So we have a project to a change order, a 1:1. Then we have these as 1:n for explanations. LISTAGG concatenates all these. We have RMRKS_SN values, 1 for each remark and/or for each 254K of characters.

The largest RMRKS_SN was found to be 31, so I did the first dataset pulling SN 0 to 15, the 2nd dataset 16 to 30 and the last dataset 31 to 45 -- hey, let's plan on someone adding a LOT of explanation to some change orders!

In the SQL report, the Tablix ties to the first dataset. To get the other data, here's the expression:

=First(Fields!NON_STD_TXT.Value, "DataSet_EXPLAN") & First(Fields!NON_STD_TXT.Value, "ds_EXPLAN_SN_16_TO_30") & First(Fields!NON_STD_TXT.Value, "ds_EXPLAN_SN_31_TO_45")

For us, we have to have DB Group create functions, etc. because of security constraints. So with a bit of creativity, we didn't have to do a User Aggregate or a UDF.

If your application has some sort of SN to aggregate by, this method should work. I don't know what the equivalent TSQL is -- we're fortunate to be dealing with Oracle for this report, for which LISTAGG is a Godsend.

The code is:

SELECT
LT.C_O_NBR AS LT_CO_NUM,
RT.C_O_NBR AS RT_CO_NUM,
LT.STD_LN_ITM_NBR, 
RT.NON_STD_LN_ITM_NBR,
RT.NON_STD_PRJ_NBR, 
LT.STD_PRJ_NBR, 
NVL(LT.PRPSL_LN_NBR, RT.PRPSL_LN_NBR) AS PRPSL_LN_NBR,
LT.STD_CO_EXPL_TXT AS STD_TXT,
LT.STD_CO_EXPLN_T, 
LT.STD_CO_EXPL_SN, 
RT.NON_STD_CO_EXPLN_T,
LISTAGG(RT.RMRKS_TXT_FLD, '') 
    WITHIN GROUP(ORDER BY RT.RMRKS_SN) AS NON_STD_TXT

FROM ...

    WHERE RT.RMRKS_SN BETWEEN 0 AND 15

GROUP BY 
    LT.C_O_NBR,
    RT.C_O_NBR,
    ...

And in the other 2 datasets just select the LISTAGG only for the subqueries in the FROM:

SELECT
LISTAGG(RT.RMRKS_TXT_FLD, '') 
    WITHIN GROUP(ORDER BY RT.RMRKS_SN) AS NON_STD_TXT

FROM ...

WHERE RT.RMRKS_SN BETWEEN 31 AND 45

...

... and so on.

How do I protect javascript files?

I agree with everyone else here: With JS on the client, the cat is out of the bag and there is nothing completely foolproof that can be done.

Having said that; in some cases I do this to put some hurdles in the way of those who want to take a look at the code. This is how the algorithm works (roughly)

  1. The server creates 3 hashed and salted values. One for the current timestamp, and the other two for each of the next 2 seconds. These values are sent over to the client via Ajax to the client as a comma delimited string; from my PHP module. In some cases, I think you can hard-bake these values into a script section of HTML when the page is formed, and delete that script tag once the use of the hashes is over The server is CORS protected and does all the usual SERVER_NAME etc check (which is not much of a protection but at least provides some modicum of resistance to script kiddies).

  2. Also it would be nice, if the the server checks if there was indeed an authenticated user's client doing this

  3. The client then sends the same 3 hashed values back to the server thru an ajax call to fetch the actual JS that I need. The server checks the hashes against the current time stamp there... The three values ensure that the data is being sent within the 3 second window to account for latency between the browser and the server

  4. The server needs to be convinced that one of the hashes is matched correctly; and if so it would send over the crucial JS back to the client. This is a simple, crude "One time use Password" without the need for any database at the back end.

  5. This means, that any hacker has only the 3 second window period since the generation of the first set of hashes to get to the actual JS code.

  6. The entire client code can be inside an IIFE function so some of the variables inside the client are even more harder to read from the Inspector console

    This is not any deep solution: A determined hacker can register, get an account and then ask the server to generate the first three hashes; by doing tricks to go around Ajax and CORS; and then make the client perform the second call to get to the actual code -- but it is a reasonable amount of work.

Moreover, if the Salt used by the server is based on the login credentials; the server may be able to detect who is that user who tried to retreive the sensitive JS (The server needs to do some more additional work regarding the behaviour of the user AFTER the sensitive JS was retreived, and block the person if the person, say for example, did not do some other activity which was expected)

An old, crude version of this was done for a hackathon here: http://planwithin.com/demo/tadr.html That wil not work in case the server detects too much latency, and it goes beyond the 3 second window period

How to connect Android app to MySQL database?

The one way is by using webservice, simply write a webservice method in PHP or any other language . And From your android app by using http client request and response , you can hit the web service method which will return whatever you want.

For PHP You can create a webservice like this. Assuming below we have a php file in the server. And the route of the file is yourdomain.com/api.php

if(isset($_GET['api_call'])){
    switch($_GET['api_call']){
       case 'userlogin':
           //perform your userlogin task here
       break; 
    }
}

Now you can use Volley or Retrofit to send a network request to the above PHP Script and then, actually the php script will handle the database operation.

In this case the PHP script is called a RESTful API.

You can learn all the operation at MySQL from this tutorial. Android MySQL Tutorial to Perform CRUD.

Simulate limited bandwidth from within Chrome?

If you are on a Mac, the Chrome dev team recommend the 'Network Link Conditioner Tool'

Either:

Xcode > Open Developer Tool > More Developer Tools > Hardware IO Tools for Xcode

Or if you don't want to install Xcode:

Go to the Apple Download Center and search for Hardware IO Tools

https://developer.apple.com/downloads/index.action

Combine multiple Collections into a single logical Collection?

Plain Java 8 solutions using a Stream.

Constant number

Assuming private Collection<T> c, c2, c3.

One solution:

public Stream<T> stream() {
    return Stream.concat(Stream.concat(c.stream(), c2.stream()), c3.stream());
}

Another solution:

public Stream<T> stream() {
    return Stream.of(c, c2, c3).flatMap(Collection::stream);
}

Variable number

Assuming private Collection<Collection<T>> cs:

public Stream<T> stream() {
    return cs.stream().flatMap(Collection::stream);
}

PHP Unset Session Variable

unset is a function, not an operator. Use it like unset($_SESSION['key']); to unset that session key. You can, however, use session_destroy(); as well. (Make sure to start the session with session_start(); as well)

How to import a csv file into MySQL workbench?

In the navigator under SCHEMAS, right click your schema/database and select "Table Data Import Wizard"

Works for mac too.

Find in Files: Search all code in Team Foundation Server

Assuming you have Notepad++, an often-missed feature is 'Find in files', which is extremely fast and comes with filters, regular expressions, replace and all the N++ goodies.

How to remove carriage return and newline from a variable in shell script

yet another solution uses tr:

echo $testVar | tr -d '\r'
cat myscript | tr -d '\r'

the option -d stands for delete.

UPDATE and REPLACE part of a string

For anyone want to replace your script.

update dbo.[TABLE_NAME] set COLUMN_NAME= replace(COLUMN_NAME, 'old_value', 'new_value') where COLUMN_NAME like %CONDITION%

Fill drop down list on selection of another drop down list

enter image description here

enter image description here

enter image description here

Model:

namespace MvcApplicationrazor.Models
{
    public class CountryModel
    {
        public List<State> StateModel { get; set; }
        public SelectList FilteredCity { get; set; }
    }
    public class State
    {
        public int Id { get; set; }
        public string StateName { get; set; }
    }
    public class City
    {
        public int Id { get; set; }
        public int StateId { get; set; }
        public string CityName { get; set; }
    }
}   

Controller:

public ActionResult Index()
        {
            CountryModel objcountrymodel = new CountryModel();
            objcountrymodel.StateModel = new List<State>();
            objcountrymodel.StateModel = GetAllState();
            return View(objcountrymodel);
        }


        //Action result for ajax call
        [HttpPost]
        public ActionResult GetCityByStateId(int stateid)
        {
            List<City> objcity = new List<City>();
            objcity = GetAllCity().Where(m => m.StateId == stateid).ToList();
            SelectList obgcity = new SelectList(objcity, "Id", "CityName", 0);
            return Json(obgcity);
        }
        // Collection for state
        public List<State> GetAllState()
        {
            List<State> objstate = new List<State>();
            objstate.Add(new State { Id = 0, StateName = "Select State" });
            objstate.Add(new State { Id = 1, StateName = "State 1" });
            objstate.Add(new State { Id = 2, StateName = "State 2" });
            objstate.Add(new State { Id = 3, StateName = "State 3" });
            objstate.Add(new State { Id = 4, StateName = "State 4" });
            return objstate;
        }
        //collection for city
        public List<City> GetAllCity()
        {
            List<City> objcity = new List<City>();
            objcity.Add(new City { Id = 1, StateId = 1, CityName = "City1-1" });
            objcity.Add(new City { Id = 2, StateId = 2, CityName = "City2-1" });
            objcity.Add(new City { Id = 3, StateId = 4, CityName = "City4-1" });
            objcity.Add(new City { Id = 4, StateId = 1, CityName = "City1-2" });
            objcity.Add(new City { Id = 5, StateId = 1, CityName = "City1-3" });
            objcity.Add(new City { Id = 6, StateId = 4, CityName = "City4-2" });
            return objcity;
        }

View:

@model MvcApplicationrazor.Models.CountryModel
@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script>
<script language="javascript" type="text/javascript">
    function GetCity(_stateId) {
        var procemessage = "<option value='0'> Please wait...</option>";
        $("#ddlcity").html(procemessage).show();
        var url = "/Test/GetCityByStateId/";

        $.ajax({
            url: url,
            data: { stateid: _stateId },
            cache: false,
            type: "POST",
            success: function (data) {
                var markup = "<option value='0'>Select City</option>";
                for (var x = 0; x < data.length; x++) {
                    markup += "<option value=" + data[x].Value + ">" + data[x].Text + "</option>";
                }
                $("#ddlcity").html(markup).show();
            },
            error: function (reponse) {
                alert("error : " + reponse);
            }
        });

    }
</script>
<h4>
 MVC Cascading Dropdown List Using Jquery</h4>
@using (Html.BeginForm())
{
    @Html.DropDownListFor(m => m.StateModel, new SelectList(Model.StateModel, "Id", "StateName"), new { @id = "ddlstate", @style = "width:200px;", @onchange = "javascript:GetCity(this.value);" })
    <br />
    <br />
    <select id="ddlcity" name="ddlcity" style="width: 200px">

    </select>

    <br /><br />
  }

Uncaught SyntaxError: Unexpected token :

When you request your JSON file, server returns JavaScript Content-Type header (text/javascript) instead of JSON (application/json).

According to MooTools docs:

Responses with javascript content-type will be evaluated automatically.

In result MooTools tries to evaluate your JSON as JavaScript, and when you try to evaluate such JSON:

{"votes":47,"totalvotes":90}

as JavaScript, parser treats { and } as a block scope instead of object notation. It is the same as evaluating following "code":

"votes":47,"totalvotes":90

As you can see, : is totally unexpected there.

The solution is to set correct Content-Type header for the JSON file. If you save it with .json extension, your server should do it by itself.

How to determine if binary tree is balanced?

Balance is a truly subtle property; you think you know what it is, but it's so easy to get wrong. In particular, even Eric Lippert's (good) answer is off. That's because the notion of height is not enough. You need to have the concept of minimum and maximum heights of a tree (where the minimum height is the least number of steps from the root to a leaf, and the maximum is... well, you get the picture). Given that, we can define balance to be:

A tree where the maximum height of any branch is no more than one more than the minimum height of any branch.

(This actually implies that the branches are themselves balanced; you can pick the same branch for both maximum and minimum.)

All you need to do to verify this property is a simple tree traversal keeping track of the current depth. The first time you backtrack, that gives you a baseline depth. Each time after that when you backtrack, you compare the new depth against the baseline

  • if it's equal to the baseline, then you just continue
  • if it is more than one different, the tree isn't balanced
  • if it is one off, then you now know the range for balance, and all subsequent depths (when you're about to backtrack) must be either the first or the second value.

In code:

class Tree {
    Tree left, right;
    static interface Observer {
        public void before();
        public void after();
        public boolean end();
    }
    static boolean traverse(Tree t, Observer o) {
        if (t == null) {
            return o.end();
        } else {
            o.before();
            try {
                if (traverse(left, o))
                    return traverse(right, o);
                return false;
            } finally {
                o.after();
            }
        }
    }
    boolean balanced() {
        final Integer[] heights = new Integer[2];
        return traverse(this, new Observer() {
            int h;
            public void before() { h++; }
            public void after() { h--; }
            public boolean end() {
                if (heights[0] == null) {
                    heights[0] = h;
                } else if (Math.abs(heights[0] - h) > 1) {
                    return false;
                } else if (heights[0] != h) {
                    if (heights[1] == null) {
                        heights[1] = h;
                    } else if (heights[1] != h) {
                        return false;
                    }
                }
                return true;
            }
        });
    }
}

I suppose you could do this without using the Observer pattern, but I find it easier to reason this way.


[EDIT]: Why you can't just take the height of each side. Consider this tree:

        /\
       /  \
      /    \
     /      \_____
    /\      /     \_
   /  \    /      / \
  /\   C  /\     /   \
 /  \    /  \   /\   /\
A    B  D    E F  G H  J

OK, a bit messy, but each side of the root is balanced: C is depth 2, A, B, D, E are depth 3, and F, G, H, J are depth 4. The height of the left branch is 2 (remember the height decreases as you traverse the branch), the height of the right branch is 3. Yet the overall tree is not balanced as there is a difference in height of 2 between C and F. You need a minimax specification (though the actual algorithm can be less complex as there should be only two permitted heights).

Map HTML to JSON

Thank you @Gorge Reith. Working off the solution provided by @George Reith, here is a function that furthers (1) separates out the individual 'hrefs' links (because they might be useful), (2) uses attributes as keys (since attributes are more descriptive), and (3) it's usable within Node.js without needing Chrome by using the 'jsdom' package:

const jsdom = require('jsdom') // npm install jsdom provides in-built Window.js without needing Chrome


// Function to map HTML DOM attributes to inner text and hrefs
function mapDOM(html_string, json) {
    treeObject = {}

    // IMPT: use jsdom because of in-built Window.js
    // DOMParser() does not provide client-side window for element access if coding in Nodejs
    dom = new jsdom.JSDOM(html_string)
    document = dom.window.document
    element = document.firstChild

    // Recursively loop through DOM elements and assign attributes to inner text object
    // Why attributes instead of elements? 1. attributes more descriptive, 2. usually important and lesser
    function treeHTML(element, object) {
        var nodeList = element.childNodes;
        if (nodeList != null) {
           if (nodeList.length) {
               object[element.nodeName] = []  // IMPT: empty [] array for non-text recursivable elements (see below)
               for (var i = 0; i < nodeList.length; i++) {
                   // if final text
                   if (nodeList[i].nodeType == 3) {
                       if (element.attributes != null) {
                           for (var j = 0; j < element.attributes.length; j++) {
                                if (element.attributes[j].nodeValue !== '' && 
                                    nodeList[i].nodeValue !== '') {
                                    if (element.attributes[j].name === 'href') { // separate href
                                        object[element.attributes[j].name] = element.attributes[j].nodeValue;
                                    } else {
                                        object[element.attributes[j].nodeValue] = nodeList[i].nodeValue;
                                    }

                                }
                           }
                       }
                   // else if non-text then recurse on recursivable elements
                   } else {
                       object[element.nodeName].push({}); // if non-text push {} into empty [] array
                       treeHTML(nodeList[i], object[element.nodeName][object[element.nodeName].length -1]);
                   }
               }
           }
        }
    }
    treeHTML(element, treeObject);

    return (json) ? JSON.stringify(treeObject) : treeObject;
}

How do you set the width of an HTML Helper TextBox in ASP.NET MVC?

Don't use the length parameter as it will not work with all browsers. The best way is to set a style on the input tag.

<input style="width:100px" />

Regular expression to match any character being repeated more than 10 times

On some apps you need to remove the slashes to make it work.

/(.)\1{9,}/

or this:

(.)\1{9,}

MomentJS getting JavaScript Date in UTC

A timestamp is a point in time. Typically this can be represented by a number of milliseconds past an epoc (the Unix Epoc of Jan 1 1970 12AM UTC). The format of that point in time depends on the time zone. While it is the same point in time, the "hours value" is not the same among time zones and one must take into account the offset from the UTC.

Here's some code to illustrate. A point is time is captured in three different ways.

var moment = require( 'moment' );

var localDate = new Date();
var localMoment = moment();
var utcMoment = moment.utc();
var utcDate = new Date( utcMoment.format() );

//These are all the same
console.log( 'localData unix = ' + localDate.valueOf() );
console.log( 'localMoment unix = ' + localMoment.valueOf() );
console.log( 'utcMoment unix = ' + utcMoment.valueOf() );

//These formats are different
console.log( 'localDate = ' + localDate );
console.log( 'localMoment string = ' + localMoment.format() );
console.log( 'utcMoment string = ' + utcMoment.format() );
console.log( 'utcDate  = ' + utcDate );

//One to show conversion
console.log( 'localDate as UTC format = ' + moment.utc( localDate ).format() );
console.log( 'localDate as UTC unix = ' + moment.utc( localDate ).valueOf() );

Which outputs this:

localData unix = 1415806206570
localMoment unix = 1415806206570
utcMoment unix = 1415806206570
localDate = Wed Nov 12 2014 10:30:06 GMT-0500 (EST)
localMoment string = 2014-11-12T10:30:06-05:00
utcMoment string = 2014-11-12T15:30:06+00:00
utcDate  = Wed Nov 12 2014 10:30:06 GMT-0500 (EST)
localDate as UTC format = 2014-11-12T15:30:06+00:00
localDate as UTC unix = 1415806206570

In terms of milliseconds, each are the same. It is the exact same point in time (though in some runs, the later millisecond is one higher).

As far as format, each can be represented in a particular timezone. And the formatting of that timezone'd string looks different, for the exact same point in time!

Are you going to compare these time values? Just convert to milliseconds. One value of milliseconds is always less than, equal to or greater than another millisecond value.

Do you want to compare specific 'hour' or 'day' values and worried they "came from" different timezones? Convert to UTC first using moment.utc( existingDate ), and then do operations. Examples of those conversions, when coming out of the DB, are the last console.log calls in the example.

What's the opposite of 'make install', i.e. how do you uninstall a library in Linux?

There is no standard unfortunately, this is one of the perils of installing from source. Some Makefiles will include an "uninstall", so

make uninstall

from the source directory may work. Otherwise, it may be a matter of manually undoing whatever the make install did.

make clean usually just cleans up the source directory - removing generated/compiled files and the like, probably not what you're after.

Cannot find mysql.sock

The original questions seems to come from confusion about a) where is the file, and b) where is it being looked for (and why can't we find it there when we do a locate or grep). I think Alnitak's point was that you want to find where it was linked to - but grep will not show you a link, right? The file doesn't live there, since it's a link it is just a pointer. You still need to know where to put the link.

my sock file is definitely in /tmp and the ERROR I am getting is looking for it in /var/lib/ (not just /var) I have linked to /var and /var/lib now, and I still am getting the error "Cannot connect to local MySQL server through socket 'var/lib/mysql.sock' (2)".

Note the (2) after the error.... I found on another thread that this means the socket might be indeed attempted to be used, but something is wrong with the socket itself - so to shut down the machine - completely - so that the socket closes. Then a restart should fix it. I tried this, but it didn't work for me (now I question if I restarted too quickly? really?) Maybe it will be a solution for someone else.

Python function pointer

funcdict = {
  'mypackage.mymodule.myfunction': mypackage.mymodule.myfunction,
    ....
}

funcdict[myvar](parameter1, parameter2)

Difference between signature versions - V1 (Jar Signature) and V2 (Full APK Signature) while generating a signed APK in Android Studio?

It is written here that "By default, Android Studio 2.2 and the Android Plugin for Gradle 2.2 sign your app using both APK Signature Scheme v2 and the traditional signing scheme, which uses JAR signing."

As it seems that these new checkboxes appeared with Android 2.3, I understand that my previous versions of Android Studio (at least the 2.2) did sign with both signatures. So, to continue as I did before, I think that it is better to check both checkboxes.

EDIT March 31st, 2017 : submitted several apps with both signatures => no problem :)

Add "Appendix" before "A" in thesis TOC

You can easily achieve what you want using the appendix package. Here's a sample file that shows you how. The key is the titletoc option when calling the package. It takes whatever value you've defined in \appendixname and the default value is Appendix.

\documentclass{report}
\usepackage[titletoc]{appendix}
\begin{document}
\tableofcontents

\chapter{Lorem ipsum}
\section{Dolor sit amet}
\begin{appendices}
  \chapter{Consectetur adipiscing elit}
  \chapter{Mauris euismod}
\end{appendices}
\end{document}

The output looks like

enter image description here

Capitalize first letter. MySQL

You can use a combination of UCASE(), MID() and CONCAT():

SELECT CONCAT(UCASE(MID(name,1,1)),MID(name,2)) AS name FROM names;

add elements to object array

I know this is old, but came across it looking for a simpler way, and this is how i do it, just create a new list of the same object and add it to the one you want to use e.g.

Subject[] subjectsList = {new Subject1{....}, new Subject2{....}, new Subject3{....}} 
univStudent.subjects = subjectsList ;

Revert to Eclipse default settings

you need to do the process for all individual languages you work on...

enter image description here

When to use self over $this?

DO NOT USE self::, use static::

There is another aspect of self:: that is worth mentioning. Annoyingly self:: refers to the scope at the point of definition not at the point of execution. Consider this simple class with two methods:

class Person
{

    public static function status()
    {
        self::getStatus();
    }

    protected static function getStatus()
    {
        echo "Person is alive";
    }

}

If we call Person::status() we will see "Person is alive" . Now consider what happens when we make a class that inherits from this:

class Deceased extends Person
{

    protected static function getStatus()
    {
        echo "Person is deceased";
    }

}

Calling Deceased::status() we would expect to see "Person is deceased" however what we see is "Person is alive" as the scope contains the original method definition when call to self::getStatus() was defined.

PHP 5.3 has a solution. the static:: resolution operator implements "late static binding" which is a fancy way of saying that it's bound to the scope of the class called. Change the line in status() to static::getStatus() and the results are what you would expect. In older versions of PHP you will have to find a kludge to do this.

See PHP Documentation

So to answer the question not as asked ...

$this-> refers to the current object (an instance of a class), whereas static:: refers to a class

ignoring any 'bin' directory on a git project

If the pattern inside .gitignore ends with a slash /, it will only find a match with a directory.

In other words, bin/ will match a directory bin and paths underneath it, but will not match a regular file or a symbolic link bin.


If the pattern does not contain a slash, like in bin Git treats it as a shell glob pattern (greedy). So best would be to use simple /bin.

bin would not be the best solution for this particular problem.

Android ACTION_IMAGE_CAPTURE Intent

this is a well documented bug in some versions of android. that is, on google experience builds of android, image capture doesn't work as documented. what i've generally used is something like this in a utilities class.

public boolean hasImageCaptureBug() {

    // list of known devices that have the bug
    ArrayList<String> devices = new ArrayList<String>();
    devices.add("android-devphone1/dream_devphone/dream");
    devices.add("generic/sdk/generic");
    devices.add("vodafone/vfpioneer/sapphire");
    devices.add("tmobile/kila/dream");
    devices.add("verizon/voles/sholes");
    devices.add("google_ion/google_ion/sapphire");

    return devices.contains(android.os.Build.BRAND + "/" + android.os.Build.PRODUCT + "/"
            + android.os.Build.DEVICE);

}

then when i launch image capture, i create an intent that checks for the bug.

Intent i = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
if (hasImageCaptureBug()) {
    i.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File("/sdcard/tmp")));
} else {
    i.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
}
startActivityForResult(i, mRequestCode);

then in activity that i return to, i do different things based on the device.

protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
     switch (requestCode) {
         case GlobalConstants.IMAGE_CAPTURE:
             Uri u;
             if (hasImageCaptureBug()) {
                 File fi = new File("/sdcard/tmp");
                 try {
                     u = Uri.parse(android.provider.MediaStore.Images.Media.insertImage(getContentResolver(), fi.getAbsolutePath(), null, null));
                     if (!fi.delete()) {
                         Log.i("logMarker", "Failed to delete " + fi);
                     }
                 } catch (FileNotFoundException e) {
                     e.printStackTrace();
                 }
             } else {
                u = intent.getData();
            }
    }

this saves you having to write a new camera app, but this code isn't great either. the big problems are

  1. you never get full sized images from the devices with the bug. you get pictures that are 512px wide that are inserted into the image content provider. on devices without the bug, everything works as document, you get a big normal picture.

  2. you have to maintain the list. as written, it is possible for devices to be flashed with a version of android (say cyanogenmod's builds) that has the bug fixed. if that happens, your code will crash. the fix is to use the entire device fingerprint.

Initialize Array of Objects using NSArray

This might not really answer the question, but just in case someone just need to quickly send a string value to a function that require a NSArray parameter.

NSArray *data = @[@"The String Value"];

if you need to send more than just 1 string value, you could also use

NSArray *data = @[@"The String Value", @"Second String", @"Third etc"];

then you can send it to the function like below

theFunction(data);

Pandas timeseries plot setting x-axis major and minor ticks and labels

Both pandas and matplotlib.dates use matplotlib.units for locating the ticks.

But while matplotlib.dates has convenient ways to set the ticks manually, pandas seems to have the focus on auto formatting so far (you can have a look at the code for date conversion and formatting in pandas).

So for the moment it seems more reasonable to use matplotlib.dates (as mentioned by @BrenBarn in his comment).

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt 
import matplotlib.dates as dates

idx = pd.date_range('2011-05-01', '2011-07-01')
s = pd.Series(np.random.randn(len(idx)), index=idx)

fig, ax = plt.subplots()
ax.plot_date(idx.to_pydatetime(), s, 'v-')
ax.xaxis.set_minor_locator(dates.WeekdayLocator(byweekday=(1),
                                                interval=1))
ax.xaxis.set_minor_formatter(dates.DateFormatter('%d\n%a'))
ax.xaxis.grid(True, which="minor")
ax.yaxis.grid()
ax.xaxis.set_major_locator(dates.MonthLocator())
ax.xaxis.set_major_formatter(dates.DateFormatter('\n\n\n%b\n%Y'))
plt.tight_layout()
plt.show()

pandas_like_date_fomatting

(my locale is German, so that Tuesday [Tue] becomes Dienstag [Di])

Is Django for the frontend or backend?

Neither.

Django is a framework, not a language. Python is the language in which Django is written.

Django is a collection of Python libs allowing you to quickly and efficiently create a quality Web application, and is suitable for both frontend and backend.

However, Django is pretty famous for its "Django admin", an auto generated backend that allows you to manage your website in a blink for a lot of simple use cases without having to code much.

More precisely, for the front end, Django helps you with data selection, formatting, and display. It features URL management, a templating language, authentication mechanisms, cache hooks, and various navigation tools such as paginators.

For the backend, Django comes with an ORM that lets you manipulate your data source with ease, forms (an HTML independent implementation) to process user input and validate data and signals, and an implementation of the observer pattern. Plus a tons of use-case specific nifty little tools.

For the rest of the backend work Django doesn't help with, you just use regular Python. Business logic is a pretty broad term.

You probably want to know as well that Django comes with the concept of apps, a self contained pluggable Django library that solves a problem. The Django community is huge, and so there are numerous apps that do specific business logic that vanilla Django doesn't.

How to lowercase a pandas dataframe string column if it has missing values?

Use apply function,

Xlower = df['x'].apply(lambda x: x.upper()).head(10) 

How do I create sql query for searching partial matches?

This may work as well.

SELECT * 
FROM myTable
WHERE CHARINDEX('mall', name) > 0
  OR CHARINDEX('mall', description) > 0

rebase in progress. Cannot commit. How to proceed or stop (abort)?

I got stuck in 'rebase status', I got

On branch master
Your branch is up to date with 'origin/master'.

You are currently rebasing.
  (all conflicts fixed: run "git rebase --continue")

nothing to commit, working tree clean

but running git rebase --skip yielded error: could not read '.git/rebase-apply/head-name': No such file or directory.

Running rm -fr ".git/rebase-apply" helped.

Note: of course, do it only if you don't care about the rebase or if you're stuck on a previous rebase you don't want anymore.

What does the red exclamation point icon in Eclipse mean?

I also faced a similar problem when i tried to import Source file and JAR file from one machine to another machine. The path of the JAR was different on new machine compared to old machine. I resolved it as belows

  1. Right click on the "Project name"
  2. Select "Build path"
  3. Then select "Configure Build Path"
  4. Click on "Libraries"
  5. Remove all the libraries which were referring to old path

Then, the exclamation symbol on the "Project name" was removed.

Call JavaScript function on DropDownList SelectedIndexChanged Event:

Or you can do it like as well:

<asp:DropDownList ID="ddl" runat="server"  AutoPostBack="true" onchange="javascript:CalcTotalAmt();" OnSelectedIndexChanged="ddl_SelectedIndexChanged"></asp:DropDownList>

Linux bash: Multiple variable assignment

First thing that comes into my mind:

read -r a b c <<<$(echo 1 2 3) ; echo "$a|$b|$c"

output is, unsurprisingly

1|2|3

Determine function name from within that function (without using traceback)

This is actually derived from the other answers to the question.

Here's my take:

import sys

# for current func name, specify 0 or no argument.
# for name of caller of current func, specify 1.
# for name of caller of caller of current func, specify 2. etc.
currentFuncName = lambda n=0: sys._getframe(n + 1).f_code.co_name


def testFunction():
    print "You are in function:", currentFuncName()
    print "This function's caller was:", currentFuncName(1)    


def invokeTest():
    testFunction()


invokeTest()

# end of file

The likely advantage of this version over using inspect.stack() is that it should be thousands of times faster [see Alex Melihoff's post and timings regarding using sys._getframe() versus using inspect.stack() ].

Fatal error compiling: invalid target release: 1.8 -> [Help 1]

The issue was resolved as I was having a JDK pointing to 1.7 and JRE pointing to 1.8. Check in the command prompt by typing

java -version

and

javac -version

Both should be same.  

CSS: On hover show and hide different div's at the same time?

Have you tried somethig like this?

.showme{display: none;}
.showhim:hover .showme{display : block;}
.hideme{display:block;}
.showhim:hover .hideme{display:none;}

<div class="showhim">HOVER ME
  <div class="showme">hai</div>
  <div class="hideme">bye</div>
</div>

I dont know any reason why it shouldn't be possible.

Render Partial View Using jQuery in ASP.NET MVC

Another thing you can try (based on tvanfosson's answer) is this:

<div class="renderaction fade-in" 
    data-actionurl="@Url.Action("details","user", new { id = Model.ID } )"></div>

And then in the scripts section of your page:

<script type="text/javascript">
    $(function () {
        $(".renderaction").each(function (i, n) {
            var $n = $(n),
                url = $n.attr('data-actionurl'),
                $this = $(this);

            $.get(url, function (data) {
                $this.html(data);
            });
        });
    });

</script>

This renders your @Html.RenderAction using ajax.

And to make it all fansy sjmansy you can add a fade-in effect using this css:

/* make keyframes that tell the start state and the end state of our object */
@-webkit-keyframes fadeIn { from { opacity:0; } to { opacity:1; } }
@-moz-keyframes fadeIn { from { opacity:0; } to { opacity:1; } }
@keyframes fadeIn { from { opacity:0; } to { opacity:1; } }

.fade-in {
    opacity: 0; /* make things invisible upon start */
    -webkit-animation: fadeIn ease-in 1; /* call our keyframe named fadeIn, use animattion ease-in and repeat it only 1 time */
    -moz-animation: fadeIn ease-in 1;
    -o-animation: fadeIn ease-in 1;
    animation: fadeIn ease-in 1;
    -webkit-animation-fill-mode: forwards; /* this makes sure that after animation is done we remain at the last keyframe value (opacity: 1)*/
    -o-animation-fill-mode: forwards;
    animation-fill-mode: forwards;
    -webkit-animation-duration: 1s;
    -moz-animation-duration: 1s;
    -o-animation-duration: 1s;
    animation-duration: 1s;
}

Man I love mvc :-)

Django check for any exists for a query

this worked for me!

if some_queryset.objects.all().exists(): print("this table is not empty")

alternatives to REPLACE on a text or ntext datatype

IF your data won't overflow 4000 characters AND you're on SQL Server 2000 or compatibility level of 8 or SQL Server 2000:

UPDATE [CMS_DB_test].[dbo].[cms_HtmlText] 
SET Content = CAST(REPLACE(CAST(Content as NVarchar(4000)),'ABC','DEF') AS NText)
WHERE Content LIKE '%ABC%' 

For SQL Server 2005+:

UPDATE [CMS_DB_test].[dbo].[cms_HtmlText] 
SET Content = CAST(REPLACE(CAST(Content as NVarchar(MAX)),'ABC','DEF') AS NText)
WHERE Content LIKE '%ABC%' 

Exit a Script On Error

Here is the way to do it:

#!/bin/sh

abort()
{
    echo >&2 '
***************
*** ABORTED ***
***************
'
    echo "An error occurred. Exiting..." >&2
    exit 1
}

trap 'abort' 0

set -e

# Add your script below....
# If an error occurs, the abort() function will be called.
#----------------------------------------------------------
# ===> Your script goes here
# Done!
trap : 0

echo >&2 '
************
*** DONE *** 
************
'

How to handle the click event in Listview in android?

According to my test,

  1. implements OnItemClickListener -> works.

  2. setOnItemClickListener -> works.

  3. ListView is clickable by default (API 19)

The important thing is, "click" only works to TextView (if you choose simple_list_item_1.xml as item). That means if you provide text data for the ListView, "click" works when you click on text area. Click on empty area does not trigger "click event".

Class not registered Error

My problem and the solution

  1. I have a 32 bit third party dll which I have installed in 2008 R2 machine which is 64 bit.

  2. I have a wcf service created in .net 4.5 framework which calls the 32 bit third party dll for process. Now I have build property set to target 'any' cpu and deployed it to the 64 bit machine.

  3. When Ii tried to invoke the wcf service got error "80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG"

  4. Now Ii used ProcMon.exe to trace the com registry issue and identified that the process is looking for the registry entry at HKLM\CLSID and HKCR\CLSID where there is no entry.

  5. Came to know that Microsoft will not register the 32 bit com components to the paths HKLM\CLSID, HKCR\CLSID in 64 bit machine rather it places the entry in HKLM\Wow6432Node\CLSID and HKCR\Wow6432Node\CLSID paths.

  6. Now the conflict is 64 bit process trying to invoke 32 bit process in 64 bit machine which will look for the registry entry in HKLM\CLSID, HKCR\CLSID. The solution is we have to force the 64 bit process to look at the registry entry at HKLM\Wow6432Node\CLSID and HKCR\Wow6432Node\CLSID.

  7. This can be achieved by configuring the wcf service project properties to target to 'X86' machine instead of 'Any'.

  8. After deploying the 'X86' version to the 2008 R2 server got the issue "System.BadImageFormatException: Could not load file or assembly"

  9. Solution to this badimageformatexception is setting the 'Enable32bitApplications' to 'True' in IIS Apppool properties for the right apppool.

Skip certain tables with mysqldump

I like Rubo77's solution, I hadn't seen it before I modified Paul's. This one will backup a single database, excluding any tables you don't want. It will then gzip it, and delete any files over 8 days old. I will probably use 2 versions of this that do a full (minus logs table) once a day, and another that just backs up the most important tables that change the most every hour using a couple cron jobs.

#!/bin/sh
PASSWORD=XXXX
HOST=127.0.0.1
USER=root
DATABASE=MyFavoriteDB

now="$(date +'%d_%m_%Y_%H_%M')"
filename="${DATABASE}_db_backup_$now"
backupfolder="/opt/backups/mysql"
DB_FILE="$backupfolder/$filename"
logfile="$backupfolder/"backup_log_"$(date +'%Y_%m')".txt

EXCLUDED_TABLES=(
logs
)
IGNORED_TABLES_STRING=''
for TABLE in "${EXCLUDED_TABLES[@]}"
do :
   IGNORED_TABLES_STRING+=" --ignore-table=${DATABASE}.${TABLE}"
done

echo "Dump structure started at $(date +'%d-%m-%Y %H:%M:%S')" >> "$logfile"
mysqldump --host=${HOST} --user=${USER} --password=${PASSWORD} --single-transaction --no-data --routines ${DATABASE}  > ${DB_FILE} 
echo "Dump structure finished at $(date +'%d-%m-%Y %H:%M:%S')" >> "$logfile"
echo "Dump content"
mysqldump --host=${HOST} --user=${USER} --password=${PASSWORD} ${DATABASE} --no-create-info --skip-triggers ${IGNORED_TABLES_STRING} >> ${DB_FILE}
gzip ${DB_FILE}

find "$backupfolder" -name ${DATABASE}_db_backup_* -mtime +8 -exec rm {} \;
echo "old files deleted" >> "$logfile"
echo "operation finished at $(date +'%d-%m-%Y %H:%M:%S')" >> "$logfile"
echo "*****************" >> "$logfile"
exit 0

How to use curl to get a GET request exactly same as using Chrome?

Check the HTTP headers that chrome is sending with the request (Using browser extension or proxy) then try sending the same headers with CURL - Possibly one at a time till you figure out which header(s) makes the request work.

curl -A [user-agent] -H [headers] "http://something.com/api"

Python list subtraction operation

Use set difference

>>> z = list(set(x) - set(y))
>>> z
[0, 8, 2, 4, 6]

Or you might just have x and y be sets so you don't have to do any conversions.

How to get the URL without any parameters in JavaScript?

This is possible, but you'll have to build it manually from the location object:

location.protocol + '//' + location.host + location.pathname

HTML table sort

Another approach to sort HTML table. (based on W3.JS HTML Sort)

_x000D_
_x000D_
let tid = "#usersTable";_x000D_
let headers = document.querySelectorAll(tid + " th");_x000D_
_x000D_
// Sort the table element when clicking on the table headers_x000D_
headers.forEach(function(element, i) {_x000D_
  element.addEventListener("click", function() {_x000D_
    w3.sortHTML(tid, ".item", "td:nth-child(" + (i + 1) + ")");_x000D_
  });_x000D_
});
_x000D_
th {_x000D_
  cursor: pointer;_x000D_
  background-color: coral;_x000D_
}
_x000D_
<script src="https://www.w3schools.com/lib/w3.js"></script>_x000D_
<link href="https://www.w3schools.com/w3css/4/w3.css" rel="stylesheet" />_x000D_
<p>Click the <strong>table headers</strong> to sort the table accordingly:</p>_x000D_
_x000D_
<table id="usersTable" class="w3-table-all">_x000D_
  <!--     _x000D_
  <tr>_x000D_
    <th onclick="w3.sortHTML('#usersTable', '.item', 'td:nth-child(1)')">Name</th>_x000D_
    <th onclick="w3.sortHTML('#usersTable', '.item', 'td:nth-child(2)')">Address</th>_x000D_
    <th onclick="w3.sortHTML('#usersTable', '.item', 'td:nth-child(3)')">Sales Person</th>_x000D_
  </tr> _x000D_
  -->_x000D_
  <tr>_x000D_
    <th>Name</th>_x000D_
    <th>Address</th>_x000D_
    <th>Sales Person</th>_x000D_
  </tr>_x000D_
_x000D_
  <tr class="item">_x000D_
    <td>user:2911002</td>_x000D_
    <td>UK</td>_x000D_
    <td>Melissa</td>_x000D_
  </tr>_x000D_
  <tr class="item">_x000D_
    <td>user:2201002</td>_x000D_
    <td>France</td>_x000D_
    <td>Justin</td>_x000D_
  </tr>_x000D_
  <tr class="item">_x000D_
    <td>user:2901092</td>_x000D_
    <td>San Francisco</td>_x000D_
    <td>Judy</td>_x000D_
  </tr>_x000D_
  <tr class="item">_x000D_
    <td>user:2801002</td>_x000D_
    <td>Canada</td>_x000D_
    <td>Skipper</td>_x000D_
  </tr>_x000D_
  <tr class="item">_x000D_
    <td>user:2901009</td>_x000D_
    <td>Christchurch</td>_x000D_
    <td>Alex</td>_x000D_
  </tr>_x000D_
_x000D_
</table>
_x000D_
_x000D_
_x000D_

How to create a bash script to check the SSH connection?

Example Using BASH 4+ script:

# -- ip/host and res which is result of nmap (note must have nmap installed)
ip="192.168.0.1"
res=$(nmap ${ip} -PN -p ssh | grep open)

# -- if result contains open, we can reach ssh else assume failure) --
if [[ "${res}" =~ "open" ]] ;then
    echo "It's Open! Let's SSH to it.."
else
    echo "The host ${ip} is not accessible!"
fi

Why should I use a pointer rather than the object itself?

There are many benefits of using pointers to object -

  1. Efficiency (as you already pointed out). Passing objects to functions mean creating new copies of object.
  2. Working with objects from third party libraries. If your object belongs to a third party code and the authors intend the usage of their objects through pointers only (no copy constructors etc) the only way you can pass around this object is using pointers. Passing by value may cause issues. (Deep copy / shallow copy issues).
  3. if the object owns a resource and you want that the ownership should not be sahred with other objects.

Format string to a 3 digit number

You can also do : string.Format("{0:D3}, 3);

How to unzip a list of tuples into individual lists?

Use zip(*list):

>>> l = [(1,2), (3,4), (8,9)]
>>> list(zip(*l))
[(1, 3, 8), (2, 4, 9)]

The zip() function pairs up the elements from all inputs, starting with the first values, then the second, etc. By using *l you apply all tuples in l as separate arguments to the zip() function, so zip() pairs up 1 with 3 with 8 first, then 2 with 4 and 9. Those happen to correspond nicely with the columns, or the transposition of l.

zip() produces tuples; if you must have mutable list objects, just map() the tuples to lists or use a list comprehension to produce a list of lists:

map(list, zip(*l))          # keep it a generator
[list(t) for t in zip(*l)]  # consume the zip generator into a list of lists

How to calculate number of days between two given dates?

There is also a datetime.toordinal() method that was not mentioned yet:

import datetime
print(datetime.date(2008,9,26).toordinal() - datetime.date(2008,8,18).toordinal())  # 39

https://docs.python.org/3/library/datetime.html#datetime.date.toordinal

date.toordinal()

Return the proleptic Gregorian ordinal of the date, where January 1 of year 1 has ordinal 1. For any date object d, date.fromordinal(d.toordinal()) == d.

Seems well suited for calculating days difference, though not as readable as timedelta.days.

How to get rid of `deprecated conversion from string constant to ‘char*’` warnings in GCC?

just use -w option for g++

example:

g++ -w -o simple.o simple.cpp -lpthread

Remember this doesn't avoid deprecation rather it prevents showing warning message on the terminal.

Now if you really want to avoid deprecation use const keyword like this:

const char* s="constant string";  

Explicitly select items from a list or tuple

like often when you have a boolean numpy array like mask

[mylist[i] for i in np.arange(len(mask), dtype=int)[mask]]

A lambda that works for any sequence or np.array:

subseq = lambda myseq, mask : [myseq[i] for i in np.arange(len(mask), dtype=int)[mask]]

newseq = subseq(myseq, mask)

How to check if ping responded or not in a batch file

I hope this helps someone. I use this bit of logic to verify if network shares are responsive before checking the individual paths. It should handle DNS names and IP addresses

A valid path in the text file would be \192.168.1.2\'folder' or \NAS\'folder'

@echo off
title Network Folder Check

pushd "%~dp0"
:00
cls

for /f "delims=\\" %%A in (Files-to-Check.txt) do set Server=%%A
    setlocal EnableDelayedExpansion
        ping -n 1 %Server% | findstr TTL= >nul 
            if %errorlevel%==1 ( 
                ping -n 1 %Server% | findstr "Reply from" | findstr "time" >nul
                    if !errorlevel!==1 (echo Network Asset %Server% Not Found & pause & goto EOF)
            )
:EOF

Get current date in Swift 3?

You can do it in this way with Swift 3.0:

let date = Date()
let calendar = Calendar.current
let components = calendar.dateComponents([.year, .month, .day], from: date)

let year =  components.year
let month = components.month
let day = components.day

print(year)
print(month)
print(day)

Reading in double values with scanf in c

As far as i know %d means decadic which is number without decimal point. if you want to load double value, use %lf conversion (long float). for printf your values are wrong for same reason, %d is used only for integer (and possibly chars if you know what you are doing) numbers.

Example:

double a,b;
printf("--------\n"); //seperate lines
scanf("%lf",&a);
printf("--------\n"); 
scanf("%lf",&b);
printf("%lf %lf",a,b);

SQLAlchemy ORDER BY DESCENDING?

Just as an FYI, you can also specify those things as column attributes. For instance, I might have done:

.order_by(model.Entry.amount.desc())

This is handy since it avoids an import, and you can use it on other places such as in a relation definition, etc.

For more information, you can refer this

How do I write a Python dictionary to a csv file?

Your code was very close to working.

Try using a regular csv.writer rather than a DictWriter. The latter is mainly used for writing a list of dictionaries.

Here's some code that writes each key/value pair on a separate row:

import csv

somedict = dict(raymond='red', rachel='blue', matthew='green')
with open('mycsvfile.csv','wb') as f:
    w = csv.writer(f)
    w.writerows(somedict.items())

If instead you want all the keys on one row and all the values on the next, that is also easy:

with open('mycsvfile.csv','wb') as f:
    w = csv.writer(f)
    w.writerow(somedict.keys())
    w.writerow(somedict.values())

Pro tip: When developing code like this, set the writer to w = csv.writer(sys.stderr) so you can more easily see what is being generated. When the logic is perfected, switch back to w = csv.writer(f).