How Can I Run Specific Python Versions (e.g., 2.5 and 2.6) on Windows?

Multiple Python Versions on Windows: A Comprehensive Guide

When working with multiple Python versions on Windows, it's essential to understand how to specify which version you want to execute for different projects. This article will provide a detailed guide to managing multiple Python installations and choosing the desired version.

Background:

You have installed both Python 2.5 and 2.6 on your Windows XP SP2 machine and wish to use different versions for distinct projects.

Solution:

To execute a specific Python version, simply specify the correct executable. Instead of typing "python" on the command line, which may result in Windows selecting the first matching executable in the %PATH% environment variable, manually invoke the targeted executable.

Option 1: Explicit Execution

Use the full path to the desired Python executable. For instance, to run Python 2.5:

c:\python.5\python.exe

Similarly, for Python 2.6:

c:\python.6\python.exe

Option 2: Shortcut Creation

Create shortcuts for each Python version (e.g., "python25" and "python26") that point to the respective python.exe executables. You can then simply type these shortcut names to run the desired versions.

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