[issue20738] 3.4 cherry-pick: 7b80f57f904e fix 20641

[Martin v. Löwis]

New submission from Martin v. Löwis:

Fix 7b80f57f904e for issue20641.

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assignee: larry
messages: 211970
nosy: larry, loewis
priority: release blocker
severity: normal
status: open
title: 3.4 cherry-pick: 7b80f57f904e fix 20641
versions: Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20738>
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