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Improving type support for math.prod (#13572)

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cake-monotone
2025-03-04 00:41:34 +09:00
committed by GitHub
parent 175e700656
commit 9f11db4296
3 changed files with 92 additions and 3 deletions
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stdlib/math.pyi
+23 -3
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@@ -1,6 +1,7 @@
import sys
from _typeshed import SupportsMul, SupportsRMul
from collections.abc import Iterable
from typing import Final, Protocol, SupportsFloat, SupportsIndex, TypeVar, overload
from typing import Any, Final, Literal, Protocol, SupportsFloat, SupportsIndex, TypeVar, overload
from typing_extensions import TypeAlias
_T = TypeVar("_T")
@@ -99,10 +100,29 @@ elif sys.version_info >= (3, 9):
def perm(n: SupportsIndex, k: SupportsIndex | None = None, /) -> int: ...
def pow(x: _SupportsFloatOrIndex, y: _SupportsFloatOrIndex, /) -> float: ...
_PositiveInteger: TypeAlias = Literal[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25]
_NegativeInteger: TypeAlias = Literal[-1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12, -13, -14, -15, -16, -17, -18, -19, -20]
_LiteralInteger = _PositiveInteger | _NegativeInteger | Literal[0] # noqa: Y026 # TODO: Use TypeAlias once mypy bugs are fixed
_MultiplicableT1 = TypeVar("_MultiplicableT1", bound=SupportsMul[Any, Any])
_MultiplicableT2 = TypeVar("_MultiplicableT2", bound=SupportsMul[Any, Any])
class _SupportsProdWithNoDefaultGiven(SupportsMul[Any, Any], SupportsRMul[int, Any], Protocol): ...
_SupportsProdNoDefaultT = TypeVar("_SupportsProdNoDefaultT", bound=_SupportsProdWithNoDefaultGiven)
# This stub is based on the type stub for `builtins.sum`.
# Like `builtins.sum`, it cannot be precisely represented in a type stub
# without introducing many false positives.
# For more details on its limitations and false positives, see #13572.
# Instead, just like `builtins.sum`, we explicitly handle several useful cases.
@overload
def prod(iterable: Iterable[SupportsIndex], /, *, start: SupportsIndex = 1) -> int: ... # type: ignore[overload-overlap]
def prod(iterable: Iterable[bool | _LiteralInteger], /, *, start: int = 1) -> int: ... # type: ignore[overload-overlap]
@overload
def prod(iterable: Iterable[_SupportsFloatOrIndex], /, *, start: _SupportsFloatOrIndex = 1) -> float: ...
def prod(iterable: Iterable[_SupportsProdNoDefaultT], /) -> _SupportsProdNoDefaultT | Literal[1]: ...
@overload
def prod(iterable: Iterable[_MultiplicableT1], /, *, start: _MultiplicableT2) -> _MultiplicableT1 | _MultiplicableT2: ...
def radians(x: _SupportsFloatOrIndex, /) -> float: ...
def remainder(x: _SupportsFloatOrIndex, y: _SupportsFloatOrIndex, /) -> float: ...
def sin(x: _SupportsFloatOrIndex, /) -> float: ...