[issue36301] Add _Py_PreInitialize() function

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

Note for myself: PYTHONDEVMODE=1, PreConfig isolated=1, CoreConfig isolated=0: is the dev mode enabled or not? IMHO it should not. Maybe add a specific unit test?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36301>
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