[issue31070] test_threaded_import: KeyError ignored in _get_module_lock.<locals>.cb on AMD64 Windows8.1 Refleaks 3.x

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I think the solution can be simpler. PR 3033 uses the global import lock for guarding modification of the _module_locks dictionary.

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components: +Interpreter Core -Tests
stage:  -> patch review
type:  -> behavior
versions: +Python 3.6

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<http://bugs.python.org/issue31070>
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