[docs] [issue18939] Venv docs regarding original python install

[Graham Wideman]

Graham Wideman added the comment:

Thanks R. David for your comments.

> It should also mention that the activation is per-shell-session,

.. which also has implications (or lack of effect) for launching from Windows Explorer, for example.

Seems like in practical use, one would need to set up a batch file or shell script to run a particular venv activate command and launch a command shell with that python environment already set up. "Shell for python 2.7.5 and library XYZ" etc.

Advice along these lines would be helpful.

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<http://bugs.python.org/issue18939>
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