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

You should look into virtualenv. I got to know about it from this blog post, which talks about pip and fabric, also very useful tools for the Python developer.