dictionary unpacking operator in dict expression

[guoci]

BPO	26489
Nosy	@berkerpeksag, @guoci
Files	unpack_in_dict.patch: 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 = None
closed_at = <Date 2016-03-06.14:55:02.556>
created_at = <Date 2016-03-05.22:00:40.822>
labels = ['type-feature']
title = 'dictionary unpacking operator in dict expression'
updated_at = <Date 2016-03-06.14:55:02.554>
user = 'https://github.com/guoci'

bugs.python.org fields:

activity = <Date 2016-03-06.14:55:02.554>
actor = 'berker.peksag'
assignee = 'none'
closed = True
closed_date = <Date 2016-03-06.14:55:02.556>
closer = 'berker.peksag'
components = ['Demos and Tools']
creation = <Date 2016-03-05.22:00:40.822>
creator = 'guoci'
dependencies = []
files = ['42075']
hgrepos = []
issue_num = 26489
keywords = ['patch']
message_count = 3.0
messages = ['261226', '261255', '261256']
nosy_count = 3.0
nosy_names = ['python-dev', 'berker.peksag', 'guoci']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue26489'
versions = ['Python 3.5', 'Python 3.6']

[guoci]

The attached patch enables the unparse.py tool to unparse dictionary unpacking operators (**) in a dict expression, for example,

{**{'y': 2}, 'x': 1}

, as described in PEP-0448.

[python-dev]

New changeset a34428aff42d by Berker Peksag in branch '3.5':
Issue bpo-26489: Add dictionary unpacking support to Tools/parser/unparse.py
https://hg.python.org/cpython/rev/a34428aff42d

New changeset 1b212e366b66 by Berker Peksag in branch 'default':
Issue bpo-26489: Add dictionary unpacking support to Tools/parser/unparse.py
https://hg.python.org/cpython/rev/1b212e366b66

[berkerpeksag]

Thanks for the patch! Could you please sign the contributor's agreement at https://www.python.org/psf/contrib/contrib-form/ ?