pythonselect

pythonselect is a tool to set the current Python version; it is included with ActivePython. If you have multiple Python versions installed - say, 2.6, 2.7 and 3.1 - then running the following will set Python 2.7 to be your current Python:

$ sudo pysel 2.7
or
C:\> pysel 2.7

How does it work?

On OSX, pythonselect creates symlinks in /usr/local/bin (hence sudo is required) linking to appropriate binaries in your non-system framework Python install at /Library/Frameworks/Python.framework.

On Windows, pythonselect manipulates the system %PATH% environment variable, AppPath and .py/.pyw associations. You will have to launch a new Command Prompt. Windows support is experimental. Note that on Vista and Windows 7, pysel must be run from an Administrator Command Window.

Credits

pythonselect is originally based on Komodo's internal set-curr-python.py.

Roadmap

Linux support is on the horizon.