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Harmonise UserDict.fromkeys with dict.fromkeys (#6488)

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Alex Waygood
2021-12-04 12:56:30 +00:00
committed by GitHub
parent da895e3944
commit 9e0ee447c6
2 changed files with 9 additions and 2 deletions
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2
stdlib/builtins.pyi
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@@ -842,7 +842,7 @@ class dict(MutableMapping[_KT, _VT], Generic[_KT, _VT]):
def keys(self) -> dict_keys[_KT, _VT]: ...
def values(self) -> dict_values[_KT, _VT]: ...
def items(self) -> dict_items[_KT, _VT]: ...
# Signature of `dict.fromkeys` should be kept identical to `fromkeys` methods in `collections.OrderedDict`/`collections.ChainMap`
# Signature of `dict.fromkeys` should be kept identical to `fromkeys` methods of `OrderedDict`/`ChainMap`/`UserDict` in `collections`
# TODO: the true signature of `dict.fromkeys` is not expressable in the current type system.
# See #3800 & https://github.com/python/typing/issues/548#issuecomment-683336963.
@classmethod

9
stdlib/collections/__init__.pyi
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@@ -45,8 +45,15 @@ class UserDict(MutableMapping[_KT, _VT]):
def __iter__(self) -> Iterator[_KT]: ...
def __contains__(self, key: object) -> bool: ...
def copy(self: Self) -> Self: ...
# `UserDict.fromkeys` has the same semantics as `dict.fromkeys`, so should be kept in line with `dict.fromkeys`.
# TODO: Much like `dict.fromkeys`, the true signature of `UserDict.fromkeys` is inexpressable in the current type system.
# See #3800 & https://github.com/python/typing/issues/548#issuecomment-683336963.
@classmethod
def fromkeys(cls: Type[Self], iterable: Iterable[_KT], value: _VT | None = ...) -> Self: ...
@overload
def fromkeys(cls, iterable: Iterable[_T], value: None = ...) -> UserDict[_T, Any | None]: ...
@classmethod
@overload
def fromkeys(cls, iterable: Iterable[_T], value: _S) -> UserDict[_T, _S]: ...
class UserList(MutableSequence[_T]):
data: list[_T]