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bpo-34235: PyArg_ParseTupleAndKeywords: support required keyword arguments - #11834

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msullivan wants to merge 3 commits into
python:mainfrom
msullivan:required-kwonly
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bpo-34235: PyArg_ParseTupleAndKeywords: support required keyword arguments#11834
msullivan wants to merge 3 commits into
python:mainfrom
msullivan:required-kwonly

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@msullivan

@msullivan msullivan commented Feb 13, 2019

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This adds a @ glyph to the PyArg_ParseTupleAndKeywords that
specifies that subsequent arguments are required keyword-only
arguments. It must appear after | and $, and allows functions to
take all four combinations of positional/named-only
v. required/optional arguments.

The restriction that @ only appear after | and $ have already
appeared is because it substantially simplifies the state machine and
because $ already only works properly when | is specified (though
this is not checked).

https://bugs.python.org/issue34235

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This adds a `@` glyph to the PyArg_ParseTupleAndKeywords that
specifies that subsequent arguments are required keyword-only
arguments. It must appear after `|` and `$`, and allows functions to
take all four combinations of positional/named-only
v. required/optional arguments.

The restriction that `@` only appear after `|` and `$` have already
appeared is because it substantially simplifies the state machine and
because `$` already only works properly when `|` is specified (though
this is not *checked*).
@vstinner

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@serhiy-storchaka: Would you mind to review this PR?

@serhiy-storchaka

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I want to try other options first.

@msullivan

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I'm working on trying out some of the other options that Serhiy suggested, but have been busy

@iritkatriel iritkatriel left a comment

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This has merge conflicts now, as well as an unresolved discussion.

@bedevere-bot

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A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

And if you don't make the requested changes, you will be put in the comfy chair!

@msullivan

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I can come back to this if there's any interest, but it wasn't clear to me that anybody wanted this but me

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8 participants