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

Use virtualenv, which allows you to create dynamic python environments. Check out python's page here.

http://pypi.python.org/pypi/virtualenv

Related answered question on installing packages inside virtualenv on windows (as opposed to system-wide) Can I install Python windows packages into virtualenvs?