[Distutils] repeatable and updatable virtualenv

[Suno Ano]

 Chris> Hi All, How can I set up a virtualenv in such a way that I can
 Chris> version control the packages and their versions that are
 Chris> installed in it?

requirements.txt and pip has already been mentioned. If you need to
version control particular packages, you might use pip install -e and
install them directly from e.g. Git/SVN/...