Comments (4)
gvanrossum
commented on June 6, 2024
1
Yeah, there are some subtle differences between sequence patterns and
mapping patterns, and I think it's best to be strict here so people learn
about those differences.
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gvanrossum
commented on June 6, 2024
We could just make these syntax errors, the _ is not a normal identifier in patterns.
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brandtbucher
commented on June 6, 2024
True. The only reason I'm hesitant is that we'd still probably want to allow *_ in sequence patterns, which is a bit confusing. But it's not too complicated of a rule, so I could honestly go either way. Besides, we already have different restrictions on starred patterns in these two contexts (in mapping patterns, they must appear last).
Outlawing them for now still leaves open the possibility of allowing them in the future, too.
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gvanrossum
commented on June 6, 2024
Note that what we add to the PEP should call out that *_ is allowed (since in sequence patterns this is meaningful).
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Related Issues (20)
- Phrasing update in abstract and overview HOT 2
- Disallow guards when using an "open pattern"? HOT 11
- Can the compiler move guards around? HOT 7
- JSON example HOT 5
- Add link to DLS paper to PEP 635 HOT 1
- Reach out to Pablo for code review HOT 1
- Use "as" for named patterns HOT 2
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- Catch remaining errors in the compiler HOT 1
- Unify the PEP 634 and implementation grammars HOT 2
- Review progress for the reference implementation HOT 5
- Thomas Wouters' objections HOT 13
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- PyCon 2021 HOT 10
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