The line

    aux=matriz;

Does not make a copy of `matriz`, it merely creates a new reference to `matriz` named `aux`.  You probably want

    aux=matriz[:]

Which will make a copy, assuming `matriz` is a simple data structure.  If it is more complex, you should probably use [`copy.deepcopy`](http://docs.python.org/library/copy.html)

    aux = copy.deepcopy(matriz)

As an aside, you don&#39;t need semi-colons after each statement, python doesn&#39;t use them as EOL markers.

Use [copy][1] module

    aux = copy.deepcopy(matriz) # there is copy.copy too for shallow copying

Minor one: semicolons are not needed.


  [1]: http://docs.python.org/library/copy.html

`aux` is _not_ a copy of `matrix`, it&#39;s just a different name that refers to the same object.

Use the [copy module](http://docs.python.org/library/copy.html) to create actual copies of your objects.

I am creating an appliction in which a line gets generated between two points given at runtime.  
The problem that I see is that `onTouch()` is called twice for every click on my simulator. I know that two actions (`ACTION_DOWN` &amp; `ACTION_UP`) are checked. But I want my app to call `onTouch()` just once. Please give me some ideas. This is the code that I used:

    SurfaceView surfaceview = new SurfaceView(getContext());
    SurfaceHolder h = surfaceview.getHolder();
    int action = event.getActionMasked();
    synchronized(h) {
        if (action == MotionEvent.ACTION_DOWN &amp;&amp; action!=MotionEvent.ACTION_CANCEL)// &amp;&amp; flag==true)
        {
            Log.d(&quot;TouchView&quot;,&quot;ACTION_DOWN &quot;);
            Point pointer = new Point();
            pointer.x = (int) event.getX();
            pointer.y = (int) event.getY();
            touchPoint.add(pointer);
            view.invalidate();
            Log.d(&quot;MotionEvent.ACTION_DOWN&quot;, &quot;point: &quot; + pointer);
            action = MotionEvent.ACTION_CANCEL;
            flag = false;
        }
        else if(action == MotionEvent.ACTION_UP &amp;&amp; action!=MotionEvent.ACTION_CANCEL)// &amp;&amp; flag==true)
        {
            Log.d(&quot;TouchView&quot;,&quot;ACTION_UP&quot;);
            Point pointer = new Point();
            pointer.x = (int) event.getX();
            pointer.y = (int) event.getY();
            touchPoint.add(pointer);
            view.invalidate();
            Log.d(&quot;MotionEvent.ACTION_UP&quot;, &quot;point: &quot; + pointer);
            action = MotionEvent.ACTION_CANCEL;
            flag = false;
        }
        else return false;
    }

Ontouch event of OnTouchListener gets called twice in android

I have a video as a background to a web page, and I am trying to get it to loop. Here is the code:

    &lt;video autoplay=&#39;true&#39; loop=&#39;true&#39; muted=&#39;true&#39;&gt;
      &lt;source src=&#39;/admin/wallpapers/linked/4ebc66e899727777b400003c&#39; type=&#39;video/mp4&#39;&gt;&lt;/source&gt;
    &lt;/video&gt;

Even though I have told the video to loop, it does not. I also tried to get it to loop with the `onended` attribute (as per [this Mozilla support thread](http://support.mozilla.com/en-US/questions/747220), I also tried that bit of jQuery). Nothing has worked so far. Is it an issue with Chrome, or my code?

**Edit:**

I checked the Network events and HEAD of a working copy (http://fhsclock-labs.heroku.com/no-violence) versus the application I&#39;m trying to get working. The difference is the working copy is serving up the video from a static asset on Heroku (via Varnish, apparently), whilst mine is serving from GridFS (MongoDB). 

The Network tab of Chrome&#39;s Inspector show that in my application, the video is requested three times. One time the Status is &quot;pending&quot;, the second is &quot;canceled&quot;, and the final one is 200 OK. The working copy only shows two requests, one&#39;s Status is pending and the other is 206 Partial Content. However, after the video plays once, that request changes to &quot;Cancelled&quot; and it makes another request for that video. In my application, that does not happen.

As for Type, in my application, two are &quot;undefined&quot; and the other &quot;video/mp4&quot; (which it is supposed to be). In the working app, all of the requests are &quot;video/mp4&quot;.

In addition, I&#39;m getting `Resource interpreted as Other but transferred with MIME type undefined.` warnings in the Console.

I&#39;m not really quite sure where to begin on this. It&#39;s my belief that the issue is server-side, as serving the file as static assets works fine. It could be that the server isn&#39;t sending the correct content type. It could be an issue with GridFS. I do not know.

At any rate, the source is [here](http://github.com/eturk/fhsclock). Any insight that you can offer is appreciated.

HTML5 video will not loop

I have a simple problem in Python that is very very strange.

    def estExt(matriz,erro):
        # (1) Determinar o vector X das solu&#231;&#245;es
        print (&quot;Matrix after:&quot;);
        print(matriz);

        aux=matriz;
        x=solucoes(aux); # IF aux is a copy of matrix, why the matrix is changed??

        print (&quot;Matrix before: &quot;);
        print(matriz)

    ...

As you see below, the matrix `matriz` is changed in spite of the fact that `aux` is the one being changed by the function `solucoes()`.

&lt;!-- language: lang-none --&gt;

Matrix before:&lt;br&gt;
`[[7, 8, 9, 24], [8, 9, 10, 27], [9, 10, 8, 27]]`

Matrix after:&lt;br&gt;
`[[7, 8, 9, 24], [0.0, -0.14285714285714235, -0.2857142857142847, -0.42857142857142705],
  [0.0, 0.0, -3.0, -3.0000000000000018]]`


Copied variable changes the original?

I have a simple problem in Python that is very very strange.
<pre><code class="hljs language-ini">def estExt(matriz,erro):
 # (1) Determinar o vector X das soluções
 print ("Matrix after:");
 print(matriz);

 aux=matriz;
 x=solucoes(aux); # IF aux is a copy of matrix, why the matrix is changed??

 print ("Matrix before: ");
 print(matriz)

...
</code></pre>
As you see below, the matrix <code>matriz</code> is changed in spite of the fact that <code>aux</code> is the one being changed by the function <code>solucoes()</code>.

Matrix before: 
<code>[[7, 8, 9, 24], [8, 9, 10, 27], [9, 10, 8, 27]]</code>
Matrix after: 
<code>[[7, 8, 9, 24], [0.0, -0.14285714285714235, -0.2857142857142847, -0.42857142857142705], [0.0, 0.0, -3.0, -3.0000000000000018]]</code>

I&#39;m trying to write a fabric script that does a `git commit`; however, if there is nothing to commit, git exits with a status of `1`. The deploy script takes that as unsuccessful, and quits. I do want to detect *actual* failures-to-commit, so I can&#39;t just give fabric a blanket ignore for `git commit` failures. How can I allow empty-commit failures to be ignored so that deploy can continue, but still catch errors caused when a real commit fails?

    def commit():
        local(&quot;git add -p &amp;&amp; git commit&quot;)



How to git commit nothing without an error?

I am new to YAML and have been searching for ways to parse a YAML file and use/access the data from the parsed YAML. 

I have come across explanations on how to parse the YAML file, for example, the PyYAML [tutorial][1], &quot;https://stackoverflow.com/questions/1773805/best-way-to-parse-a-yaml-file&quot;, &quot;https://stackoverflow.com/questions/1305532/convert-python-dict-to-object&quot;, but what I haven&#39;t found is a simple example on how to access the data from the parsed YAML file. 

Assume I have a YAML file such as:

     treeroot:
         branch1: branch1 text
         branch2: branch2 text

How do I access the text &quot;branch1 text&quot;?

&quot;https://stackoverflow.com/questions/6866600/yaml-parsing-and-python&quot; provides a solution, but I had problems accessing the data from a more complex YAML file.  And, I&#39;m wondering if there is some standard way of accessing the data from a parsed YAML file, possibly something similar to &quot;[tree iteration][2]&quot; or &quot;[elementpath][3]&quot; notation or something which would be used when parsing an XML file?

[1]: http://pyyaml.org/wiki/PyYAMLDocumentation#Tutorial
[2]: http://lxml.de/tutorial.html#tree-iteration
[3]: http://lxml.de/tutorial.html#elementpath


Parsing a YAML file in Python, and accessing the data?

    import matplotlib.pyplot as plt
    from mpl_toolkits.mplot3d import Axes3D

Setting the aspect ratio works for 2d plots:

    ax = plt.axes()
    ax.plot([0,1],[0,10])
    ax.set_aspect(&#39;equal&#39;,&#39;box&#39;)

But does not for 3d:

    ax = plt.axes(projection=&#39;3d&#39;)
    ax.plot([0,1],[0,1],[0,10])
    ax.set_aspect(&#39;equal&#39;,&#39;box&#39;)

Is there a different syntax for the 3d case, or it&#39;s not implemented?



set matplotlib 3d plot aspect ratio

I want to pass a default argument to an instance method using the value of an attribute of the instance:

    class C:
        def __init__(self, format):
            self.format = format
        
        def process(self, formatting=self.format):
            print(formatting)

When trying that, I get the following error message:

&lt;!-- language: lang-none --&gt;

    NameError: name &#39;self&#39; is not defined

I want the method to behave like this:

    C(&quot;abc&quot;).process()       # prints &quot;abc&quot;
    C(&quot;abc&quot;).process(&quot;xyz&quot;)  # prints &quot;xyz&quot;

What is the problem here, why does this not work? And how could I make this work?

How to pass a default argument value of an instance member to a method?

I need to insert multiple rows with one query (number of rows is not constant), so I need to execute query like this one:

    INSERT INTO t (a, b) VALUES (1, 2), (3, 4), (5, 6);

The only way I know is

    args = [(1,2), (3,4), (5,6)]
    args_str = &#39;,&#39;.join(cursor.mogrify(&quot;%s&quot;, (x, )) for x in args)
    cursor.execute(&quot;INSERT INTO t (a, b) VALUES &quot;+args_str)

but I want some simpler way.

psycopg2: insert multiple rows with one query

I don&#39;t actually know how to describe what I wanted, but I&#39;ll show you:

For example:

    $data1 = &quot;the color is&quot;;
    $data2 = &quot;red&quot;;

What should I do (or process) so $result is the combination of `$data1` and `$data2`?

Desired result:

    $result = &quot;the color is red&quot;;




How can I combine two strings together in PHP?

I&#39;m trying to use string interpolation on my variable to reference another variable:

&lt;!-- language: lang-scss --&gt;

    // Set up variable and mixin
    $foo-baz: 20px;
    
    @mixin do-this($bar) {
        width: $foo-#{$bar};
    }

    // Use mixin by passing &#39;baz&#39; string as a param for use $foo-baz variable in the mixin
    @include do-this(&#39;baz&#39;);

But when I do this, I get the following error:

&gt; Undefined variable: &quot;$foo-&quot;.

Does Sass support PHP-style variable variables?

Creating or referencing variables dynamically in Sass

I want to create 5 variables of type array all at once. Is this possible? In Java I know you can, but can&#39;t find anything about PHP. I&#39;d like to do something like this:

    $var1, $var2, $var3, $var4, $var5 = array();

Can you assign multiple variables at once in PHP like you can with Java?

I have a set of variables I allow some people I work with to edit. These are True (`T`) and False (`F`) values, but I have some people that insist on putting `t` and `f` instead of the upper case values respectively. 

I use the following workaround code to properly set uppercase values:

    IF &#39;%dotnet35%&#39;==&#39;f&#39; set dotnet35=F
    IF &#39;%dotnet35%&#39;==&#39;t&#39; set dotnet35=T
    IF &#39;%dotnet40%&#39;==&#39;f&#39; set dotnet40=F
    IF &#39;%dotnet40%&#39;==&#39;t&#39; set dotnet40=T
    IF &#39;%regedit%&#39;==&#39;f&#39; set regedit=F
    IF &#39;%regedit%&#39;==&#39;t&#39; set regedit=T
    IF &#39;%SSL%&#39;==&#39;f&#39; set SSL=F
    IF &#39;%SSL%&#39;==&#39;t&#39; set SSL=T

This is however extremely bulky and it&#39;s not easy on the eyes... is there any other way of doing this without using VBS or any other programming language?

Windows batch command to ignore case sensitivity in variables

What is the meaning of a bash variable used like this:

     ${Server?}



Content Type	Original Author	Original Content on Stackoverflow
Question	André Freitas	View Question on Stackoverflow
Solution 1 - Python	brc	View Answer on Stackoverflow
Solution 2 - Python	Shekhar	View Answer on Stackoverflow
Solution 3 - Python	omz	View Answer on Stackoverflow

Copied variable changes the original?

Python Problem Overview

Python Solutions

Solution 1 - Python

Solution 2 - Python

Solution 3 - Python

HTML5 video will not loop

Ontouch event of OnTouchListener gets called twice in android

Attributions