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    <p>The last Python you install that registers itself in the environment is the default (I can't remember the exact wording in the installer, but it is the first option). There are a number of settings so to make sure they are all registered consistently just reinstall the version you want to be the default.</p> <p>If you want to install another version but don't want it as the default just disable the registration option during installation.</p> <p><strong>Edit (May 19, 2012)</strong></p> <p>Starting with Python 3.3, the Python installer installs <a href="http://docs.python.org/3/using/windows.html?highlight=python%20launcher#python-launcher-for-windows" rel="noreferrer">Python Launcher for Windows</a>. This program (<code>py.exe</code>) is associated with the Python file extensions and looks for a "shebang" comment to specify the python version to run. This allows many versions of Python to co-exist and allows Python scripts to explicitly specify which version to use, if desired. If it is not specified, the default is to use the latest Python 2.X version for the current architecture (x86 or x64). This default can be customized through a <code>py.ini</code> file or <code>PY_PYTHON</code> environment variable. See the <a href="http://docs.python.org/3/using/windows.html?highlight=python%20launcher#python-launcher-for-windows" rel="noreferrer">docs</a> for more details.</p> <p>Just make sure the Python 3.3 is the last Python installed that registered itself with Windows. If other versions of Python are installed later be sure <strong>not</strong> to register them with the environment, so the launcher will remain the default.</p> <p>Here's how to check if the launcher is registered correctly from the console:</p> <pre><code>C:\&gt;assoc .py .py=Python.File C:\&gt;ftype Python.File Python.File="C:\Windows\py.exe" "%1" %* </code></pre> <p>Above, <code>.py</code> files are associated with the <code>Python.File</code> type. The command line for <code>Python.File</code> is the Python Launcher, which is installed in the Windows directory since it is always in the PATH.</p> <p>For the association to work, run scripts from the command line with <code>script.py</code>, not "python script.py", otherwise <code>python</code> will be run instead of <code>py</code>. <code>py.exe</code> can also be run with switches to force a Python version:</p> <pre><code>py -3 script.py # force latest Python 3.X version to be used. </code></pre> <p>Additionally, add <code>.py;.pyw;.pyc;.pyo</code> to the <code>PATHEXT</code> environment variable and then the command line can just be <code>script</code> with no extension.</p>
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    1. POHow should I set the default Python version in Windows
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    1. USMark Tolonen
    1. USMark Tolonen
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      1. VTUpMod
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    1. CO+1 While I would hope that there is a better way, this worked for me. Thanks.
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      1. USwestsider
    2. CORather than completely reinstalling the version of Python that you want as the default, if you repair it from the control panel add/remove programs it has the same effect, but is much quicker.
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      1. USGiles Smith
    3. COThis advice is incorrect. Python 2.7.5 did no such thing when I installed it just now. I just had to change my PATH manually.
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      1. USTom W
 

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