Lenient handling of *tuple[Any, ...] (part 2) - #22006
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
JukkaL
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Sep 21, 2026
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Thanks, looks good -- just a few comments.
| x, y, z = t | ||
| reveal_type(x) # N: Revealed type is "builtins.int" | ||
| reveal_type(y) # N: Revealed type is "Any" | ||
| reveal_type(z) # N: Revealed type is "builtins.str" |
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Test also the case with two lvalues (tuple expands to empty).
| # Slicing support for variadic tuples is currently best effort, the key idea is to not give an error. | ||
| reveal_type(t[1:3:2]) # N: Revealed type is "builtins.tuple[builtins.int | Any | builtins.str, ...]" | ||
| reveal_type(t1[1:3:2]) # N: Revealed type is "builtins.tuple[builtins.int | Any, ...]" | ||
| reveal_type(t2[1:3:2]) # N: Revealed type is "builtins.tuple[Any | builtins.str, ...]" |
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Should t1[::0] generate an error, since it doesn't work at runtime (and doesn't make sense)?
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Yes, we do give an error for 0 stride (but the error message is bad). I will probably change the logic slightly to give a better error message.
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Ref #19858
This (smaller) part handles various edge cases that should be handled leniently in presence of
*tuple[Any, ...]: indexing and unpacking. Everything is straightforward, similar to first part #22001, the tests are focused on situations that previously gave errors.cc @JukkaL