__cmp__ removal not in What's New

[terryjreedy]

BPO	4372
Nosy	@birkenfeld, @terryjreedy, @vstinner

^{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/birkenfeld'
closed_at = <Date 2008-11-21.14:12:19.747>
created_at = <Date 2008-11-20.22:48:47.109>
labels = ['docs']
title = "__cmp__ removal not in What's New"
updated_at = <Date 2008-11-21.14:16:15.904>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2008-11-21.14:16:15.904>
actor = 'vstinner'
assignee = 'georg.brandl'
closed = True
closed_date = <Date 2008-11-21.14:12:19.747>
closer = 'vstinner'
components = ['Documentation']
creation = <Date 2008-11-20.22:48:47.109>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 4372
keywords = []
message_count = 2.0
messages = ['76147', '76183']
nosy_count = 3.0
nosy_names = ['georg.brandl', 'terry.reedy', 'vstinner']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue4372'
versions = ['Python 3.0']

[terryjreedy]

What's New in Python 3.0/Common stumbling blocks
has this "builtin.sorted() and list.sort() no longer accept the cmp
argument providing a comparison function. Use the key argument instead."

Please add "The __cmp__ special method is no longer used for
comparisons. Use __lt__ for sorting, __eq__ with __hash__, and other
rich comparisons as needed."

People are already stumbling on this.

[vstinner]

Duplicate issue: see bpo-2306. Anyway, an you write a patch?