Document that __length_hint__ may return NotImplemented

[jdemeyer]

BPO	37913
Nosy	@jdemeyer, @zooba
PRs	bpo-37913: document that __length_hint__ can return NotImplemented #15383 bpo-37913: Link to NotImplemented from new docs #15860 [3.8] bpo-37913: document that __length_hint__ can return NotImplemented (GH-15383) #15862 [3.7] bpo-37913: document that __length_hint__ can return NotImplemented (GH-15383) #15863 [3.7] bpo-37913: document that __length_hint__ can return NotImplemented (GH-15383) #15864

^{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 2019-09-10.14:58:06.273>
created_at = <Date 2019-08-22.10:17:07.813>
labels = ['3.8', 'type-feature', '3.7', '3.9', 'docs']
title = 'Document that __length_hint__ may return NotImplemented'
updated_at = <Date 2019-09-10.14:58:06.272>
user = 'https://github.com/jdemeyer'

bugs.python.org fields:

activity = <Date 2019-09-10.14:58:06.272>
actor = 'steve.dower'
assignee = 'docs@python'
closed = True
closed_date = <Date 2019-09-10.14:58:06.273>
closer = 'steve.dower'
components = ['Documentation']
creation = <Date 2019-08-22.10:17:07.813>
creator = 'jdemeyer'
dependencies = []
files = []
hgrepos = []
issue_num = 37913
keywords = ['patch']
message_count = 6.0
messages = ['350180', '351664', '351671', '351675', '351680', '351693']
nosy_count = 3.0
nosy_names = ['docs@python', 'jdemeyer', 'steve.dower']
pr_nums = ['15383', '15860', '15862', '15863', '15864']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue37913'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

[jdemeyer]

The special method __length_hint__ can return NotImplemented. In this case, the result is as if the __length_hint__ method didn't exist at all. This behaviour is implemented and tested but not documented.

[zooba]

New changeset 009ef29 by Steve Dower (Jeroen Demeyer) in branch 'master':
bpo-37913: document that __length_hint__ can return NotImplemented (GH-15383)
009ef29

[zooba]

New changeset a39a4c7 by Steve Dower in branch 'master':
bpo-37913: Link to NotImplemented from new docs (GH-15860)
a39a4c7

[zooba]

New changeset ed99bb9 by Steve Dower in branch '3.8':
bpo-37913: document that __length_hint__ can return NotImplemented (GH-15383)
ed99bb9

[zooba]

New changeset aa3b629 by Steve Dower in branch '3.7':
bpo-37913: document that __length_hint__ can return NotImplemented (GH-15383)
aa3b629

[zooba]

New changeset 756eb84 by Steve Dower (Miss Islington (bot)) in branch '3.7':
bpo-37913: document that __length_hint__ can return NotImplemented (GH-15383)
756eb84