[New-bugs-announce] [issue29754] sorted ignores reverse=True when sorting produces same list

[Tomas Dabašinskas]

New submission from Tomas Dabašinskas:

sorted ignores reverse=True when sorting produces same list, I was expecting reverse regardless of the sorting outcome.

Python 3.5.2 (default, Jul 17 2016, 00:00:00) 
[GCC 4.8.4] on linux
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>>> data = [{'name': 'first', 'weight': 1},{'name': 'second', 'weight': 1},{'name': 'third', 'weight': 1}, {'name': 'fourth', 'weight': 1}]
>>> sorted(data, key=lambda x: x['weight'], reverse=True)
[{'name': 'first', 'weight': 1}, {'name': 'second', 'weight': 1}, {'name': 'third', 'weight': 1}, {'name': 'fourth', 'weight': 1}]
>>> sorted(data, key=lambda x: x['weight'], reverse=True) == sorted(data, key=lambda x: x['weight']).reverse()
False

Thanks!

----------
components: Library (Lib)
messages: 289202
nosy: Tomas Dabašinskas
priority: normal
severity: normal
status: open
title: sorted ignores reverse=True when sorting produces same list
versions: Python 2.7, Python 3.3, Python 3.4, Python 3.5, Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29754>
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