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[itertools] More specific type hints for batched(..., strict=True) (#15277)

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Liam DeVoe
2026-01-14 05:50:40 -05:00
committed by GitHub
parent 77f8e8f2a5
commit e887eae0d2
2 changed files with 39 additions and 3 deletions
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stdlib/@tests/test_cases/itertools/check_batched.py
+21
View File
@@ -0,0 +1,21 @@
from __future__ import annotations
import sys
from typing_extensions import assert_type
if sys.version_info >= (3, 13):
from itertools import batched
assert_type(batched([0], 1, strict=True), batched[tuple[int]])
assert_type(batched([0, 0], 2, strict=True), batched[tuple[int, int]])
assert_type(batched([0, 0, 0], 3, strict=True), batched[tuple[int, int, int]])
assert_type(batched([0, 0, 0, 0], 4, strict=True), batched[tuple[int, int, int, int]])
assert_type(batched([0, 0, 0, 0, 0], 5, strict=True), batched[tuple[int, int, int, int, int]])
assert_type(batched([0], 2), batched[tuple[int, ...]])
assert_type(batched([0], 2, strict=False), batched[tuple[int, ...]])
def f() -> int:
return 3
assert_type(batched([0, 0, 0], f(), strict=True), batched[tuple[int, ...]])
stdlib/itertools.pyi
+18 -3
View File
@@ -343,9 +343,24 @@ if sys.version_info >= (3, 12):
@disjoint_base
class batched(Generic[_T_co]):
if sys.version_info >= (3, 13):
def __new__(cls, iterable: Iterable[_T_co], n: int, *, strict: bool = False) -> Self: ...
@overload
def __new__(cls, iterable: Iterable[_T], n: Literal[1], *, strict: Literal[True]) -> batched[tuple[_T]]: ...
@overload
def __new__(cls, iterable: Iterable[_T], n: Literal[2], *, strict: Literal[True]) -> batched[tuple[_T, _T]]: ...
@overload
def __new__(cls, iterable: Iterable[_T], n: Literal[3], *, strict: Literal[True]) -> batched[tuple[_T, _T, _T]]: ...
@overload
def __new__(
cls, iterable: Iterable[_T], n: Literal[4], *, strict: Literal[True]
) -> batched[tuple[_T, _T, _T, _T]]: ...
@overload
def __new__(
cls, iterable: Iterable[_T], n: Literal[5], *, strict: Literal[True]
) -> batched[tuple[_T, _T, _T, _T, _T]]: ...
@overload
def __new__(cls, iterable: Iterable[_T], n: int, *, strict: bool = False) -> batched[tuple[_T, ...]]: ...
else:
def __new__(cls, iterable: Iterable[_T_co], n: int) -> Self: ...
def __new__(cls, iterable: Iterable[_T], n: int) -> batched[tuple[_T, ...]]: ...
def __iter__(self) -> Self: ...
def __next__(self) -> tuple[_T_co, ...]: ...
def __next__(self) -> _T_co: ...