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Use TypeIs for various stdlib functions - #11823
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Primer analysis:
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Collaborator
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Looks good to me. The mypy bug (if it turns out to be one) seems obscure enough that the improvements this brings are worth it. |
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Diff from mypy_primer, showing the effect of this PR on open source code: vision (https://github.com/pytorch/vision)
+ torchvision/models/_api.py:128: error: Unused "type: ignore" comment [unused-ignore]
antidote (https://github.com/Finistere/antidote)
+ src/antidote/lib/lazy_ext/_lazy.py:171: error: Non-overlapping identity check (left operand type: "Literal[FunctionKind.VALUE]", right operand type: "Literal[FunctionKind.METHOD]") [comparison-overlap]
+ src/antidote/lib/lazy_ext/_lazy.py:174: error: Unused "type: ignore" comment [unused-ignore]
+ src/antidote/lib/lazy_ext/_lazy.py:178: error: Non-overlapping identity check (left operand type: "Literal[FunctionKind.VALUE]", right operand type: "Literal[FunctionKind.PROPERTY]") [comparison-overlap]
+ src/antidote/lib/lazy_ext/_lazy.py:181: error: Unused "type: ignore" comment [unused-ignore]
+ src/antidote/lib/lazy_ext/_lazy.py:185: error: Non-overlapping identity check (left operand type: "Literal[FunctionKind.VALUE]", right operand type: "Literal[FunctionKind.FUNCTION]") [comparison-overlap]
+ tests/lib/interface/test_function.py:44: error: Unused "type: ignore" comment [unused-ignore]
+ tests/lib/interface/test_function.py:45: error: Unused "type: ignore" comment [unused-ignore]
+ tests/lib/interface/test_function.py:78: error: Unused "type: ignore" comment [unused-ignore]
+ tests/lib/interface/test_function.py:79: error: Unused "type: ignore" comment [unused-ignore]
+ tests/lib/interface/test_function.py:83: error: Unused "type: ignore" comment [unused-ignore]
+ tests/lib/interface/test_function.py:86: error: Unused "type: ignore" comment [unused-ignore]
+ tests/lib/interface/test_function.py:89: error: Unused "type: ignore" comment [unused-ignore]
+ tests/lib/interface/test_function.py:145: error: Unused "type: ignore" comment [unused-ignore]
+ tests/lib/interface/test_function.py:154: error: Unused "type: ignore" comment [unused-ignore]
+ tests/lib/interface/test_function.py:174: error: Unused "type: ignore" comment [unused-ignore]
+ tests/lib/interface/test_function.py:188: error: Unused "type: ignore" comment [unused-ignore]
+ tests/lib/interface/test_function.py:191: error: Unused "type: ignore" comment [unused-ignore]
+ tests/lib/interface/test_function.py:194: error: Unused "type: ignore" comment [unused-ignore]
pytest (https://github.com/pytest-dev/pytest)
+ testing/test_monkeypatch.py:418: error: Statement is unreachable [unreachable]
spark (https://github.com/apache/spark)
+ python/pyspark/sql/worker/write_into_data_source.py:157: error: Unused "type: ignore" comment [unused-ignore]
+ python/pyspark/sql/worker/write_into_data_source.py:164: error: Unused "type: ignore" comment [unused-ignore]
+ python/pyspark/sql/worker/create_data_source.py:131: error: Unused "type: ignore" comment [unused-ignore]
+ python/pyspark/sql/worker/create_data_source.py:156: error: Unused "type: ignore" comment [unused-ignore]
+ python/pyspark/sql/worker/create_data_source.py:166: error: Unused "type: ignore" comment [unused-ignore]
+ python/pyspark/sql/worker/create_data_source.py:168: error: Unused "type: ignore" comment [unused-ignore]
jinja (https://github.com/pallets/jinja)
+ src/jinja2/async_utils.py:67: error: Redundant cast to "V" [redundant-cast]
discord.py (https://github.com/Rapptz/discord.py)
+ discord/utils.py:695: error: Unused "type: ignore" comment [unused-ignore]
+ discord/utils.py:701: error: Incompatible default for argument "check" (default has type "Callable[[object], TypeIs[Awaitable[Any]]]", argument has type "Callable[[T | Awaitable[T]], TypeGuard[Awaitable[T]]]") [assignment]
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Author
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I tracked it down to a preexisting mypy bug: python/mypy#8869. Given that it's a bug that is not directly related to TypeIs, I agree this is worth merging. |
Collaborator
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Hooray for the new semantics! |
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See #11453. This should start working when mypy 1.10 is released, which should be very soon.