[issue17408] second python execution fails when embedding

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

Reproduced on Linux.
The reason is in Objects/typeobject.c: import_copyreg() has a static cache of the copyreg module.
When the interpreter stops, the module is filled with None... but gets reused in the next instance.

Resetting this "mod_copyreg" variable to NULL fixes the issue.
pickle is also broken for the same reason.

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nosy: +amaury.forgeotdarc

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17408>
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