inspect: Make Signature instances picklable

[1st1]

BPO	20726
Nosy	@ncoghlan, @pitrou, @vstinner, @larryhastings, @1st1
Files	sig_picklable_01.patch sig_picklable_02.patch sig_picklable_03.patch: More tests

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/1st1'
closed_at = <Date 2014-03-27.15:32:28.222>
created_at = <Date 2014-02-22.03:21:53.516>
labels = ['type-feature']
title = 'inspect: Make Signature instances picklable'
updated_at = <Date 2014-03-29.17:24:36.034>
user = 'https://github.com/1st1'

bugs.python.org fields:

activity = <Date 2014-03-29.17:24:36.034>
actor = 'python-dev'
assignee = 'yselivanov'
closed = True
closed_date = <Date 2014-03-27.15:32:28.222>
closer = 'python-dev'
components = []
creation = <Date 2014-02-22.03:21:53.516>
creator = 'yselivanov'
dependencies = []
files = ['34179', '34186', '34217']
hgrepos = []
issue_num = 20726
keywords = ['patch']
message_count = 7.0
messages = ['211903', '211918', '211930', '214955', '214957', '214958', '215135']
nosy_count = 6.0
nosy_names = ['ncoghlan', 'pitrou', 'vstinner', 'larry', 'python-dev', 'yselivanov']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue20726'
versions = ['Python 3.5']

[1st1]

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

[pitrou]

For extra points, you could test with all protocol versions (from 0 to HIGHEST_PROTOCOL).

[1st1]

For extra points, you could test with all protocol versions (from 0 to HIGHEST_PROTOCOL).

Good idea, see the second patch.

[python-dev]

New changeset 0a8e3c910c0a by Yury Selivanov in branch 'default':
inspect.signature: Make Signature and Parameter picklable. Closes bpo-20726
http://hg.python.org/cpython/rev/0a8e3c910c0a

[vstinner]

Why not backporting this change to Python 3.4? Would it break something?

[pitrou]

Picklability is more of a new feature than a bugfix.

[python-dev]

New changeset f2bae047f6d0 by Yury Selivanov in branch 'default':
inspect.docs: Document that Signature and Parameter are now picklable (issue bpo-20726)
http://hg.python.org/cpython/rev/f2bae047f6d0