How to use multiple versions of Python without uninstallation

Question

I am faced with a unique situation, slightly trivial but painful.

I need to use Python 2.6.6 because NLTK is not ported to Python 3 (that\'s what I could gather).

Answer 1

I do use at least 3 or 4 versions of Python on my machines (Windows). The installers from http://python.org/ automatically placed them in:

c:\Python26
c:\Python27
c:\Python32

and

c:\Python24

on one machine. I mostly use Python 2.7 because some applications use wxPython and also for the older console code. This python.exe was not renamed. By the way, the Python 2.7 also supports collections.Counter.

The c:\Python26 and c:\Python24 are not included in my PATH. In c:\Python32\, the exe was renamed to py.exe. This way, python some.py starts Python 2.7, and py another.py starts Python 3.2.