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sum: Protocol defining __add__ #7578

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Merged
AlexWaygood merged 3 commits into from
Apr 1, 2022
Merged

sum: Protocol defining __add__ #7578

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f41f186
`sum`: `Protocol` defining `__add__`
jpy-git Apr 1, 2022
810250b
Make Protocol generic
jpy-git Apr 1, 2022
ae316c3
Revert to TypeVars
jpy-git Apr 1, 2022
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13 changes: 10 additions & 3 deletions stdlib/builtins.pyi
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Original file line number Diff line number Diff line change
Expand Up @@ -1477,16 +1477,23 @@ def sorted(
) -> list[SupportsRichComparisonT]: ...
@overload
def sorted(__iterable: Iterable[_T], *, key: Callable[[_T], SupportsRichComparison], reverse: bool = ...) -> list[_T]: ...

class _SupportsSum(Protocol):
def __add__(self, __x: Any) -> Any: ...

_SumT = TypeVar("_SumT", bound=_SupportsSum)
_SumS = TypeVar("_SumS", bound=_SupportsSum)

@overload
def sum(__iterable: Iterable[_T]) -> _T | Literal[0]: ...
def sum(__iterable: Iterable[_SumT]) -> _SumT | Literal[0]: ...

if sys.version_info >= (3, 8):
@overload
def sum(__iterable: Iterable[_T], start: _S) -> _T | _S: ...
def sum(__iterable: Iterable[_SumT], start: _SumS) -> _SumT | _SumS: ...

else:
@overload
def sum(__iterable: Iterable[_T], __start: _S) -> _T | _S: ...
def sum(__iterable: Iterable[_SumT], __start: _SumS) -> _SumT | _SumS: ...

# The argument to `vars()` has to have a `__dict__` attribute, so can't be annotated with `object`
# (A "SupportsDunderDict" protocol doesn't work)
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