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PEP 634: Change so __match_args__ must be a tuple #1909

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merged 2 commits into from
Apr 5, 2021
Merged

PEP 634: Change so __match_args__ must be a tuple #1909

merged 2 commits into from
Apr 5, 2021

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gvanrossum
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@gvanrossum gvanrossum commented Apr 3, 2021 •
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This was discussed on python-dev in the thread
https://mail.python.org/archives/list/python-dev@python.org/thread/YYIT3QXMLPNLXQAQ5BCXE4LLJ57EE7JV/#YYIT3QXMLPNLXQAQ5BCXE4LLJ57EE7JV

I don't think anyone disagrees that it's better if __match_args__ is required to be a tuple.

  • This helps static type checkers keep track of the values more easily
  • It allows an optimization in the implementation where the pattern only needs to be recompiled when the value is changed.

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willingc commented Apr 4, 2021 •
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@gvanrossum It looks like line 498 has an extra "`" around match_args

@Fidget-Spinner Fidget-Spinner mentioned this pull request Apr 4, 2021
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@brandtbucher -- How do you feel about implementing this change?

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@gvanrossum No problem, I'll have something up later today.

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I think this is now sufficiently non-controversial that I'm just changing the PEP and we'll update the implementation ASAP (not sure if it will make 3.10a7, if not then definitely b1).

@gvanrossum gvanrossum merged commit d635956 into master Apr 5, 2021
@gvanrossum gvanrossum deleted the match-args-tuple branch April 5, 2021 17:38
gvanrossum pushed a commit to python/cpython that referenced this pull request Apr 6, 2021
@Fidget-Spinner
Update pattern matching docs for changes to the PEP (#25185)
5143fd1 
See:
- python/peps#1909 (__match_args__ must be a tuple)
- python/peps#1908 (allow keyword patterns for int(x) etc.)
@freundTech freundTech mentioned this pull request May 10, 2021
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@erlend-aasland erlend-aasland mentioned this pull request May 13, 2022
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@erlend-aasland erlend-aasland mentioned this pull request Jun 27, 2022
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@brandtbucher brandtbucher brandtbucher approved these changes

@willingc willingc willingc approved these changes

@brettcannon brettcannon Awaiting requested review from brettcannon

@markshannon markshannon Awaiting requested review from markshannon

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@gvanrossum @willingc @brandtbucher @the-knights-who-say-ni