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lib2to3 Grammar file is no longer a Python 3 superset #63710

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ncoghlan opened this issue Nov 6, 2013 · 5 comments
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lib2to3 Grammar file is no longer a Python 3 superset #63710

ncoghlan opened this issue Nov 6, 2013 · 5 comments
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@gpshead
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docs Documentation in the Doc dir stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error

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@ncoghlan
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ncoghlan commented Nov 6, 2013

BPO 19511
Nosy @gpshead, @ncoghlan, @ezio-melotti, @meadori

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/gpshead'
closed_at = <Date 2015-12-28.22:10:16.436>
created_at = <Date 2013-11-06.12:56:51.292>
labels = ['type-bug', 'library', 'docs']
title = 'lib2to3 Grammar file is no longer a Python 3 superset'
updated_at = <Date 2015-12-28.22:10:16.435>
user = 'https://github.com/ncoghlan'

bugs.python.org fields:

activity = <Date 2015-12-28.22:10:16.435>
actor = 'ezio.melotti'
assignee = 'gregory.p.smith'
closed = True
closed_date = <Date 2015-12-28.22:10:16.436>
closer = 'ezio.melotti'
components = ['Library (Lib)', 'Devguide']
creation = <Date 2013-11-06.12:56:51.292>
creator = 'ncoghlan'
dependencies = []
files = []
hgrepos = []
issue_num = 19511
keywords = []
message_count = 5.0
messages = ['202265', '228396', '239860', '240125', '257135']
nosy_count = 5.0
nosy_names = ['gregory.p.smith', 'ncoghlan', 'ezio.melotti', 'meador.inge', 'BreamoreBoy']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue19511'
versions = ['Python 3.4', 'Python 3.5']
@ncoghlan
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ncoghlan commented Nov 6, 2013

In writing some new fixers for bpo-17823, I noticed the 2/3 bridge grammar in lib2to3 was never updated to handle "yield from".

This item is also missing from the checklist in the devguide:

http://docs.python.org/devguide/grammar.html

@ncoghlan ncoghlan added stdlib Python modules in the Lib dir docs Documentation in the Doc dir type-bug An unexpected behavior, bug, or error labels Nov 6, 2013
@BreamoreBoy
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BreamoreBoy mannequin commented Oct 3, 2014

Anybody volunteering but please don't look at me :)

@gpshead
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gpshead commented Apr 1, 2015

This is blocking Python auto formatters from working properly on Python 3 syntax code. For example: google/yapf#61

@gpshead gpshead self-assigned this Apr 1, 2015
@gpshead
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gpshead commented Apr 5, 2015

This was fixed in 3.4.1:

https://hg.python.org/cpython/log/094615256a54/Lib/lib2to3/Grammar.txt

i'm leaving this open to update the devguide.

@ezio-melotti
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I created bpo-25967 to keep track of the devguide issue, so I'm going to close this.

@ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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