[Python-ideas] Draft PEP for virtualenv in the stdlib

[Carl Meyer]

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On 10/24/2011 12:21 PM, Carl Meyer wrote:
> If the ``env.cfg`` file also contains a key ``include-system-site``
> with a value of ``false`` (not case sensitive), the ``site`` module
> will omit the system site directories entirely. This allows the
> virtual environment to be entirely isolated from system site-packages.

I'd like to flip this default and make isolation be the default, with a
flag to enable the system site-packages.

The non-isolated default I borrowed from virtualenv without a great deal
of thought, but we have had requests to flip virtualenv's default, and
it seems that many current active virtualenv users (100% of those on the
mailing list who have replied) are in favor [1]. It's looking likely
that we will make that change in virtualenv; I think venv should do the
same. The primary use case for venv is isolation, so why not make it the
default?

Carl


[1]
http://groups.google.com/group/python-virtualenv/browse_frm/thread/57e11efac3743149
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