Steve Dower <steve.do...@python.org> added the comment:

You can't create symlinks on Windows without additional user permissions, and 
the old method of copying most of the binaries was slow and made DLL hell 
worse, as well as simply not working with the Windows Store model that does not 
let random executables load DLLs from within the app.

Because of the last one, I backported the fix (which is an independent 
executable that launches the correct one with additional context to know it's a 
venv) that was mostly there for 3.8 already. This also fixes the issue where 
upgrading Python would force you to recreate every virtual environment to avoid 
mismatched binary versions (which is also why it wasn't an incompatible change 
- the update was already incompatible).

So all in all, an overall positive change. It's unfortunate that this problem 
slipped through testing, and I assume it's going to exist for many cases using 
handle inheritance. When I get a chance I'll be looking up ways to simply flag 
the new Python process it creates as "inherit everything", but there may be 
other data structures that don't transfer automatically (such as file 
descriptors, which the OS knows nothing about and can't do automatically).

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35797>
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