[issue42667] shelve module is not thread-safe during accessing different databases from different threads

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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nosy: +brett.cannon, eric.snow, ncoghlan

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42667>
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