singledispatch docs should explicitly mention support for abstract base classes

[ncoghlan]

BPO	21767
Nosy	@ncoghlan, @ambv, @vadmium
PRs	bpo-21767: explicitly mention abc support in functools.singledispatch #17171

^{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 2019-11-19.08:17:31.554>
created_at = <Date 2014-06-15.04:00:26.357>
labels = ['type-feature', 'library']
title = 'singledispatch docs should explicitly mention support for abstract base classes'
updated_at = <Date 2019-11-19.08:17:31.553>
user = 'https://github.com/ncoghlan'

bugs.python.org fields:

activity = <Date 2019-11-19.08:17:31.553>
actor = 'lukasz.langa'
assignee = 'none'
closed = True
closed_date = <Date 2019-11-19.08:17:31.554>
closer = 'lukasz.langa'
components = ['Library (Lib)']
creation = <Date 2014-06-15.04:00:26.357>
creator = 'ncoghlan'
dependencies = []
files = []
hgrepos = []
issue_num = 21767
keywords = ['patch']
message_count = 2.0
messages = ['220611', '356953']
nosy_count = 3.0
nosy_names = ['ncoghlan', 'lukasz.langa', 'martin.panter']
pr_nums = ['17171']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue21767'
versions = ['Python 3.4', 'Python 3.5']

[ncoghlan]

functools.singledispatch is integrated with the abc module for fast single dispatch even in the absence of concrete inheritance. However, this isn't obvious from the documentation, so users may not realise they can register a single ABC with the generic function, and then multiple classes with the ABC, rather than having to register each class with the generic function directly.

[ambv]

New changeset 24555ce by Łukasz Langa (Batuhan Taşkaya) in branch 'master':
bpo-21767: explicitly mention abc support in functools.singledispatch docs (bpo-17171)
24555ce