[issue22490] Using realpath for __PYVENV_LAUNCHER__ makes Homebrew installs fragile

[Ronald Oussoren]

Ronald Oussoren added the comment:

> On 25 sep. 2014, at 19:58, Ronald Oussoren <report at bugs.python.org> wrote:
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> 
> Ronald Oussoren added the comment:
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> I consider using this undocumented environment variable in distlib as a bug in distlib, which should be fixed 

Speaking of which... That environment variable shouldn't leak into Python code in the first place, launching a regular Python interpreter from a venv could currently result in unwanted behavior.  I'll try to provide an example of that. 

Ronald
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