Provide a toml module in the standard library

[mgorny]

BPO	40059
Nosy	@brettcannon, @tiran, @mcepl, @njsmith, @encukou, @agronholm, @mgorny, @dstufft, @pradyunsg, @eli-schwartz, @miss-islington, @tirkarthi, @skoslowski, @erlend-aasland, @hauntsaninja, @domdfcoding, @hukkin, @YakoYakoYokuYoku
PRs	bpo-40059: tomllib #31498 bpo-40059: Fix installation of tomllib #31784

^{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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assignee = None
closed_at = None
created_at = <Date 2020-03-25.06:54:21.437>
labels = ['type-feature', 'library']
title = 'Provide a toml module in the standard library'
updated_at = <Date 2022-03-09.13:38:15.300>
user = 'https://github.com/mgorny'

bugs.python.org fields:

activity = <Date 2022-03-09.13:38:15.300>
actor = 'miss-islington'
assignee = 'none'
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components = ['Library (Lib)']
creation = <Date 2020-03-25.06:54:21.437>
creator = 'mgorny'
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issue_num = 40059
keywords = ['patch']
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pr_nums = ['31498', '31784']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
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type = 'enhancement'
url = 'https://bugs.python.org/issue40059'
versions = []

[mgorny]

PEP-518 uses the TOML format to specify build system requirements. AFAIU this means that all new build systems will require a TOML parser. Could you consider adding one to the standard library to reduce the number of chicken-egg problems?

The referenced PEP states that 'pytoml TOML parser is ~300 lines of pure Python code', so I don't think integrating it would be a large maintenance cost.

[1] https://www.python.org/dev/peps/pep-0518/

[tirkarthi]

Relevant python-dev discussion : https://mail.python.org/pipermail/python-dev/2019-May/157405.html . The format has still not reached 1.0. Issue to track the 1.0 release candidate : toml-lang/toml#698

[brettcannon]

The plan is to start discussing adding a TOML parser once the spec reaches 1.0 (which we will know about as one of the pip contributors also manages TOML).

[VA]

1.0.0-rc.1 is out by now: https://github.com/toml-lang/toml/blob/master/CHANGELOG.md