Skip to content

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

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
srittau merged 2 commits into from
Jan 14, 2026
+39 −3
Merged

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

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
3cc9659
more specific type hints for batched(..., strict=True)
Liam-DeVoe Jan 14, 2026
3c6d8dc
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Jan 14, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
21 changes: 21 additions & 0 deletions stdlib/@tests/test_cases/itertools/check_batched.py
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -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, ...]])
21 changes: 18 additions & 3 deletions stdlib/itertools.pyi
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -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: ...