Document an alternative to ISO 8601 parsing

[pganssle]

BPO	37979
Nosy	@pitrou, @pganssle, @miss-islington
PRs	bpo-37979: Add alternative to fromisoformat in documentation #15596 [3.8] bpo-37979: Add alternative to fromisoformat in documentation (GH-15596) #15597 [3.7] bpo-37979: Add alternative to fromisoformat in documentation (GH-15596) #15598

^{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/pganssle'
closed_at = <Date 2019-08-29.14:55:44.936>
created_at = <Date 2019-08-29.14:39:34.598>
labels = ['3.8', 'type-feature', '3.7', '3.9', 'docs']
title = 'Document an alternative to ISO 8601 parsing'
updated_at = <Date 2019-08-29.14:55:44.933>
user = 'https://github.com/pganssle'

bugs.python.org fields:

activity = <Date 2019-08-29.14:55:44.933>
actor = 'pitrou'
assignee = 'p-ganssle'
closed = True
closed_date = <Date 2019-08-29.14:55:44.936>
closer = 'pitrou'
components = ['Documentation']
creation = <Date 2019-08-29.14:39:34.598>
creator = 'p-ganssle'
dependencies = []
files = []
hgrepos = []
issue_num = 37979
keywords = ['patch']
message_count = 5.0
messages = ['350784', '350786', '350788', '350789', '350790']
nosy_count = 3.0
nosy_names = ['pitrou', 'p-ganssle', 'miss-islington']
pr_nums = ['15596', '15597', '15598']
priority = 'low'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue37979'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

[pganssle]

Per Antoine's comment in the discourse thread ( https://discuss.python.org/t/parse-z-timezone-suffix-in-datetime/2220/6 ):

... the doc isn’t helpful, as it doesn’t give any alternative.

I think we can link to dateutil.parser.isoparse as an alternative. I'm happy to field other options for ISO 8601 parsers instead, though considering that fromisoformat is adapted from dateutil.parser.isoparse, it seems reasonable to link them.

[miss-islington]

New changeset 59725f3 by Miss Islington (bot) (Paul Ganssle) in branch 'master':
bpo-37979: Add alternative to fromisoformat in documentation (GH-15596)
59725f3

[miss-islington]

New changeset 8ba8cc5 by Miss Islington (bot) in branch '3.7':
bpo-37979: Add alternative to fromisoformat in documentation (GH-15596)
8ba8cc5

[miss-islington]

New changeset 9db66a2 by Miss Islington (bot) in branch '3.8':
bpo-37979: Add alternative to fromisoformat in documentation (GH-15596)
9db66a2

[pitrou]

Thanks for contributing this, Paul!