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Optional initial-value parameter for itertools.accumulate() (#3503)

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Eugene Ha
2019-11-29 20:08:26 +01:00
committed by Jelle Zijlstra
parent 359817bde9
commit 92716c6821
1 changed files with 12 additions and 1 deletions
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13
stdlib/3/itertools.pyi
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@@ -4,6 +4,7 @@
from typing import (Iterator, TypeVar, Iterable, overload, Any, Callable, Tuple,
Generic, Optional)
import sys
_T = TypeVar('_T')
_S = TypeVar('_S')
@@ -19,7 +20,17 @@ def repeat(object: _T) -> Iterator[_T]: ...
@overload
def repeat(object: _T, times: int) -> Iterator[_T]: ...
def accumulate(iterable: Iterable[_T], func: Callable[[_T, _T], _T] = ...) -> Iterator[_T]: ...
if sys.version_info >= (3, 8):
@overload
def accumulate(iterable: Iterable[_T],
func: Callable[[_T, _T], _T] = ...) -> Iterator[_T]: ...
@overload
def accumulate(iterable: Iterable[_T],
func: Callable[[_S, _T], _S],
initial: Optional[_S]) -> Iterator[_S]: ...
else:
def accumulate(iterable: Iterable[_T],
func: Callable[[_T, _T], _T] = ...) -> Iterator[_T]: ...
class chain(Iterator[_T], Generic[_T]):
def __init__(self, *iterables: Iterable[_T]) -> None: ...