Message 383065 - Python tracker

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Let me summarize the original issue with the following quote from the python-dev thead:

> doing some sys.modules acrobatics and re-importing suddenly
changes the internal state of a previously imported [_csv] module.

The issue is now solved; both reproducers from that thread pass.

If you're interested, please read PEP 630 for a general overview of where we're at w.r.t. C-API changes that started with PEP 3121.
For the API used to fix this issue, see PEP 573; for the specific fix in _csv, see GH-23224.

Thanks to everyone involved, and especially to Nick Coghlan for helping me start this journey way back in 2013 :)