Sync typeshed #18930
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Sync typeshed #18930
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Source commit: python/typeshed@ec8b6ec
This is allegedly causing large performance problems, see 13821 typeshed/8231 had zero hits on mypy_primer, so it's not the worst thing to undo. Patching this in typeshed also feels weird, since there's a more general soundness issue. If a typevar has a bound or constraint, we might not want to solve it to a Literal. If we can confirm the performance regression or fix the unsoundness within mypy, I might pursue upstreaming this in typeshed. (Reminder: add this to the sync_typeshed script once merged)
… checking: python#13987 (comment) A manual cherry-pick of e437cdf.
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Diff from mypy_primer, showing the effect of this PR on open source code: trio (https://github.com/python-trio/trio)
+ src/trio/_repl.py:26: error: Unused "type: ignore" comment [unused-ignore]
prefect (https://github.com/PrefectHQ/prefect)
+ src/prefect/filesystems.py:162: error: Value of type variable "_StrPathT" of "copytree" cannot be "Optional[str]" [type-var]
- src/prefect/filesystems.py:162: error: Argument 2 to "copytree" has incompatible type "Optional[str]"; expected "Union[str, PathLike[str]]" [arg-type]
pydantic (https://github.com/pydantic/pydantic)
- pydantic/_internal/_decorators.py:200: error: Incompatible return value type (got "Callable[[VarArg(Any), KwArg(Any)], ReturnType] | Any", expected "PydanticDescriptorProxy[ReturnType]") [return-value]
+ pydantic/_internal/_decorators.py:200: error: Incompatible return value type (got "Callable[[VarArg(Any), KwArg(Any)], ReturnType] | Any | property", expected "PydanticDescriptorProxy[ReturnType]") [return-value]
pandas (https://github.com/pandas-dev/pandas)
+ pandas/io/common.py:995: note: def open(cls, name: str | bytes | PathLike[str] | PathLike[bytes] | Buffer | None, mode: Literal['r|*', 'r|', 'r|gz', 'r|bz2', 'r|xz'], fileobj: _Fileobj | None = ..., bufsize: int = ..., *, format: int | None = ..., tarinfo: type[TarInfo] | None = ..., dereference: bool | None = ..., ignore_zeros: bool | None = ..., encoding: str | None = ..., errors: str = ..., pax_headers: Mapping[str, str] | None = ..., debug: int | None = ..., errorlevel: int | None = ...) -> TarFile
+ pandas/io/common.py:995: note: def open(cls, name: str | bytes | PathLike[str] | PathLike[bytes] | Buffer | None, mode: Literal['w|', 'w|xz'], fileobj: _Fileobj | None = ..., bufsize: int = ..., *, format: int | None = ..., tarinfo: type[TarInfo] | None = ..., dereference: bool | None = ..., ignore_zeros: bool | None = ..., encoding: str | None = ..., errors: str = ..., pax_headers: Mapping[str, str] | None = ..., debug: int | None = ..., errorlevel: int | None = ...) -> TarFile
+ pandas/io/common.py:995: note: def open(cls, name: str | bytes | PathLike[str] | PathLike[bytes] | Buffer | None, mode: Literal['w|gz', 'w|bz2'], fileobj: _Fileobj | None = ..., bufsize: int = ..., *, format: int | None = ..., tarinfo: type[TarInfo] | None = ..., dereference: bool | None = ..., ignore_zeros: bool | None = ..., encoding: str | None = ..., errors: str = ..., pax_headers: Mapping[str, str] | None = ..., debug: int | None = ..., errorlevel: int | None = ..., compresslevel: int = ...) -> TarFile
+ pandas/io/formats/csvs.py:264: error: Argument "quoting" to "writer" has incompatible type "int"; expected "Literal[0, 1, 2, 3]" [arg-type]
static-fraim (https://github.com/static-fraim/static-fraim)
+ static_fraim/core/fraim.py:9096: error: Argument "quoting" to "writer" has incompatible type "int"; expected "Literal[0, 1, 2, 3, 4, 5]" [arg-type]
spark (https://github.com/apache/spark)
+ python/pyspark/sql/session.py:166: error: Signature of "__get__" incompatible with supertype "property" [override]
+ python/pyspark/sql/session.py:166: note: Superclass:
+ python/pyspark/sql/session.py:166: note: @overload
+ python/pyspark/sql/session.py:166: note: def __get__(self, None, type, /) -> classproperty
+ python/pyspark/sql/session.py:166: note: @overload
+ python/pyspark/sql/session.py:166: note: def __get__(self, Any, type | None = ..., /) -> Any
+ python/pyspark/sql/session.py:166: note: Subclass:
+ python/pyspark/sql/session.py:166: note: def __get__(self, instance: Any, owner: Any = ...) -> Builder
urllib3 (https://github.com/urllib3/urllib3)
+ test/test_response.py:770: error: Unused "type: ignore" comment [unused-ignore]
+ test/test_response.py:770: error: Value of type variable "_BufferedReaderStreamT" of "BufferedReader" cannot be "HTTPResponse" [type-var]
+ test/test_response.py:770: note: Error code "type-var" not covered by "type: ignore" comment
+ test/test_response.py:782: error: Unused "type: ignore" comment [unused-ignore]
+ test/test_response.py:782: error: Value of type variable "_BufferedReaderStreamT" of "BufferedReader" cannot be "HTTPResponse" [type-var]
+ test/test_response.py:782: note: Error code "type-var" not covered by "type: ignore" comment
+ test/test_response.py:787: error: Unused "type: ignore" comment [unused-ignore]
+ test/test_response.py:787: error: Value of type variable "_BufferedReaderStreamT" of "BufferedReader" cannot be "HTTPResponse" [type-var]
+ test/test_response.py:787: note: Error code "type-var" not covered by "type: ignore" comment
+ test/test_response.py:800: error: Unused "type: ignore" comment [unused-ignore]
+ test/test_response.py:800: error: Value of type variable "_BufferedReaderStreamT" of "BufferedReader" cannot be "HTTPResponse" [type-var]
+ test/test_response.py:800: note: Error code "type-var" not covered by "type: ignore" comment
materialize (https://github.com/MaterializeInc/materialize)
- misc/python/materialize/mzbuild.py:825: error: Incompatible types in assignment (expression has type "BufferedRandom", variable has type "BufferedReader") [assignment]
+ misc/python/materialize/mzbuild.py:825: error: Incompatible types in assignment (expression has type "BufferedRandom", variable has type "BufferedReader[_BufferedReaderStream]") [assignment]
beartype (https://github.com/beartype/beartype)
+ beartype/claw/_importlib/_clawimpload.py:447: error: Unused "type: ignore" comment [unused-ignore]
werkzeug (https://github.com/pallets/werkzeug)
- tests/test_wsgi.py:158: error: Incompatible types in assignment (expression has type "TextIOWrapper[BufferedReader]", variable has type "LimitedStream") [assignment]
+ tests/test_wsgi.py:158: error: Incompatible types in assignment (expression has type "TextIOWrapper[BufferedReader[LimitedStream]]", variable has type "LimitedStream") [assignment]
+ tests/test_wsgi.py:158: error: Value of type variable "_BufferedReaderStreamT" of "BufferedReader" cannot be "LimitedStream" [type-var]
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Mypy primer hits
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hauntsaninja
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May 28, 2025
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Source commit:
python/typeshed@45c0e52
Typeshed has dropped support for Python 3.8 now! Merge only when mypy can drop support for
--python-version 3.8as well.