Vinay Sajip <vinay_sa...@yahoo.co.uk> added the comment:

> You can't. Tools like `pipenv shell` and `conda shell` end up with a new 
> shell running instead of changing the current shell in-place.

Indeed. I raised it because of what you said earlier:

> and so maybe proposing a simple `venv --activate <path>` that does nothing 
> more than set those key environment variables and prints out a message about 
> what is happening is enough to do the trick

So not that simple, then, if it has to handle multiple shells cross-platform. 
Especially as if tools like pew, pipenv, conda already do this. Are you 
proposing to bring that functionality, which these third-party tools perform 
currently, into the stdlib?

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<https://bugs.python.org/issue35003>
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