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Sun Feb 15 20:23:49 CET 2015 · https://mail.python.org/pipermail/python-dev/2015-February/138312.html

Paul Moore <p.f.moore <at> gmail.com> writes:

> 2. It would be a nice, although extremely obscure, feature to be able
> to allow people who want to keep Python off their path to set
> VIRTUAL_ENV but *not* set PATH, so that py.exe does the right thing
> but there's *still* no python.exe on PATH. Limit the dependency on a
> single environment variable rather than two, in other words.

If this is the case, then your patch may not work if PATH isn't set. If a 
shebang is found in a script, it is processed in maybe_handle_shebang(), which 
means that your code to look in a venv won't be hit (though if you rely on the 
PATH being correctly set, then it will work as expected because the handling 
for e.g. /usr/bin/env python searches the PATH).

Regards,

Vinay Sajip

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[Python-Dev] PEP 370 - per-user scripts directory on Windows