Duplicated keyword in distutils metadata

[AugustinLaville]

BPO	26089
Nosy	@ezio-melotti, @merwok, @berkerpeksag, @dstufft
Files	issue26089.diff

^{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 2016-04-23.22:59:29.865>
created_at = <Date 2016-01-12.09:44:50.027>
labels = ['type-feature', 'library']
title = 'Duplicated keyword in distutils metadata'
updated_at = <Date 2016-04-23.22:59:29.863>
user = 'https://bugs.python.org/AugustinLaville'

bugs.python.org fields:

activity = <Date 2016-04-23.22:59:29.863>
actor = 'berker.peksag'
assignee = 'none'
closed = True
closed_date = <Date 2016-04-23.22:59:29.865>
closer = 'berker.peksag'
components = ['Distutils']
creation = <Date 2016-01-12.09:44:50.027>
creator = 'Augustin Laville'
dependencies = []
files = ['41591']
hgrepos = []
issue_num = 26089
keywords = ['patch']
message_count = 4.0
messages = ['258091', '258093', '264075', '264076']
nosy_count = 6.0
nosy_names = ['ezio.melotti', 'eric.araujo', 'python-dev', 'berker.peksag', 'dstufft', 'Augustin Laville']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue26089'
versions = ['Python 3.6']

[AugustinLaville]

The line https://hg.python.org/cpython/file/tip/Lib/distutils/dist.py#l1016 contains the word "licence" twice.

Check only on Python, 3.5 and 3.6, may be in others versions.

[ezio-melotti]

This seems to be because the alternative spelling "licence" was also included in the list, and got changed in bpo-693470/178d19cff163.
Because of that change, the method get_licence() is not supported anymore, but at this point removing the duplicate "license" should be safe.
Attached a patch.
(Note that there seem to be no tests for the "licence" alias in Lib/distutils/tests)

[python-dev]

New changeset 21e522177ca0 by Berker Peksag in branch 'default':
Issue bpo-26089: Remove duplicate field 'license' from DistributionMetadata
https://hg.python.org/cpython/rev/21e522177ca0

[berkerpeksag]

I just committed Ezio's patch. Thanks!