[issue23839] Clear caches after every test

[Serhiy Storchaka]

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


Added file: http://bugs.python.org/file45419/regrtest_clear_caches_3.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23839>
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