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Correct return type of sum() builtin (#1582)

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`sum([])` always returns the integer 0.
This commit is contained in:
Travis Parker
2017-10-04 21:42:35 -07:00
committed by Jelle Zijlstra
parent 000041761e
commit 355f30cc70
2 changed files with 8 additions and 2 deletions
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5
stdlib/3/builtins.pyi
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@@ -861,7 +861,10 @@ def setattr(object: Any, name: str, value: Any) -> None: ...
def sorted(iterable: Iterable[_T], *,
key: Optional[Callable[[_T], Any]] = None,
reverse: bool = False) -> List[_T]: ...
def sum(iterable: Iterable[_T], start: _T = ...) -> _T: ...
@overload
def sum(iterable: Iterable[_T]) -> Union[_T, int]: ...
@overload
def sum(iterable: Iterable[_T], start: _S) -> Union[_T, _S]: ...
def vars(object: Any = ...) -> Dict[str, Any]: ...
@overload
def zip(iter1: Iterable[_T1]) -> Iterator[Tuple[_T1]]: ...