Add pickle support of dict views

[serhiy-storchaka]

BPO	23264
Nosy	@gvanrossum, @rhettinger, @pitrou, @avassalotti, @serhiy-storchaka, @MojoVampire
Files	pickle_dictviews.patch pickle_dictviews_2.patch

^{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/serhiy-storchaka'
closed_at = <Date 2016-06-07.09:18:15.793>
created_at = <Date 2015-01-18.08:11:56.829>
labels = ['interpreter-core', 'type-feature']
title = 'Add pickle support of dict views'
updated_at = <Date 2016-06-07.09:18:15.791>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2016-06-07.09:18:15.791>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2016-06-07.09:18:15.793>
closer = 'serhiy.storchaka'
components = ['Interpreter Core']
creation = <Date 2015-01-18.08:11:56.829>
creator = 'serhiy.storchaka'
dependencies = []
files = ['37758', '38015']
hgrepos = []
issue_num = 23264
keywords = ['patch']
message_count = 8.0
messages = ['234225', '234243', '235394', '267296', '267320', '267325', '267384', '267605']
nosy_count = 6.0
nosy_names = ['gvanrossum', 'rhettinger', 'pitrou', 'alexandre.vassalotti', 'serhiy.storchaka', 'josh.r']
pr_nums = []
priority = 'normal'
resolution = 'rejected'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue23264'
versions = ['Python 3.5']

[serhiy-storchaka]

For now dict views are not pickleable in Python 3 (unlike to Python 2 and unlike to dict view iterators). Proposed patch adds pickle support of dict views.

[pitrou]

This looks good to me, thank you.

[serhiy-storchaka]

Thanks Antoine. Do you have objections Raymond? I'm going to provide similar patch for MappingView.

More robust tests in updated patch.

[gvanrossum]

Why no docs?

[serhiy-storchaka]

What docs are needed?

[gvanrossum]

On general I think we should always document whether a class is picklable.
And we should document how a subclass can hook into pickling.

--Guido (mobile)

[gvanrossum]

Hm, I no longer think this is a good idea. See http://bugs.python.org/issue23401#msg267383 .

[serhiy-storchaka]

Thank you for your attention Guido.