[issue25872] multithreading traceback KeyError when modifying file

[A.M. Kuchling]

Change by A.M. Kuchling <amk at amk.ca>:


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nosy: +akuchling
nosy_count: 5.0 -> 6.0
pull_requests: +19398
pull_request: https://github.com/python/cpython/pull/20092

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue25872>
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