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Comment install both Python 2.x et Python 3.x dans Windows

ayi

How to install both Python 2.x and Python 3.x in Windows
<hr>
Source : <a href="http://docs.python.org/3.3/using/windows.html" rel="noopener nofollow ugc">Stack Overflow [windows]</a>

ayi_2

I found that the formal way to do this is as follows:
Just install two (or more, using their installers) versions of Python on Windows 7 (for me work with 3.3 and 2.7).
Follow the instuctions below, changing the parameters for your needs.
Create the following variable d’environnement (to default on double click):
<pre><code class="lang-auto">Name: PY_PYTHON
Value: 3

</code></pre>
To launch a script in a particular interpreter, add the following shebang (beginning of script):
<pre><code class="lang-auto">#! python2

</code></pre>
To execute a script using a specific interpreter, use the following prompt command:
<pre><code class="lang-auto">> py -2 MyScript.py

</code></pre>
To launch a specific interpreter:
<pre><code class="lang-auto">> py -2

</code></pre>
To launch the default interpreter (defined by the PY_PYTHON variable):
<pre><code class="lang-auto">> py

</code></pre>
Resources
Documentation: <a href="http://docs.python.org/3.3/using/windows.html">Using Python on Windows</a>
<a href="http://www.python.org/dev/peps/pep-0397/">PEP 397</a> - Python launcher for Windows