[issue30891] Sometimes, test_concurrency() of test_import fails with AttributeError: module 'package' has no attribute 'submodule' on AMD64 Windows8.1 Refleaks 3.6

[STINNER Victor]

STINNER Victor added the comment:

FYI test_concurrency() added by commit b4baacee1adc06edbe30ac7574d17a8cd168e2e0 doesn't really test bpo-30814. I backported the unit test on 1ccbad9c95cf5782a1329eeaecba6e3eb0c37cb8 (commit before b4baacee1adc06edbe30ac7574d17a8cd168e2e0), and the test pass, whereas I expected it to fail before the fix.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30891>
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