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Subject: Re: How do I update a virtualenv?
From: Skip Montanaro <skip@pobox.com>
To: Ned Batchelder <ned@nedbatchelder.com>
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Xref: csiph.com comp.lang.python:57860

> Virtualenvs aren't built to be moved from one Python installation to
> another.  If you used pip to install your packages (you should), then you
> can activate the virtualenv, and run: $ pip freeze > requirements.txt
>
> Then you can create a new virtualenv using the new Python executable,
> activate it, and:  $ pip install -r requirements.txt
>
> This will reinstall all the packages you had installed previously. Even
> better is to maintain your own requirements.txt that has just the packages
> you need.  The "pip freeze" technique will also list packages installed as
> dependencies.

Hmmm... And my git repo? I imagine I will eventually figure this out,
but updating an existing virtualenv in place to adapt to a new version
of Python (say, a new micro) or some of its libraries (contents of
requirements.txt) seems like it would be a very nice thing to have.

Skip