[issue20726] inspect: Make Signature instances picklable

[Yury Selivanov]

New submission from Yury Selivanov:

There is no reason for Signature objects to be not picklable.
Patch is attached (it will require merging #19573 before).

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assignee: yselivanov
files: sig_picklable_01.patch
keywords: patch
messages: 211903
nosy: larry, ncoghlan, yselivanov
priority: normal
severity: normal
status: open
title: inspect: Make Signature instances picklable
type: enhancement
versions: Python 3.5
Added file: http://bugs.python.org/file34179/sig_picklable_01.patch

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<http://bugs.python.org/issue20726>
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