[issue21801] inspect.signature doesn't always return a signature

[Yury Selivanov]

Changes by Yury Selivanov <yselivanov.ml at gmail.com>:


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assignee:  -> yselivanov
keywords: +needs review
versions: +Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21801>
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