R. David Murray added the comment:

Hmm.  It seems to me that that document is indeed not clear as to what is 
really going on.  My understanding has always been that there is only one 
Python interpreter, but that it behaves differently when invoked through the 
symlink in the venv.  I suppose that on Windows platforms where symlink isn't 
available it must actually copy the whole binary, but I don't use Windows so I 
don't know for sure.  (So, to answer one of your questions, you *can't* create 
a venv for a Python you don't already have installed.)

It should also mention that the activation is per-shell-session, which would 
answer some of your other questions.

----------
nosy: +r.david.murray, vinay.sajip

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