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Make Mapping covariant. #512

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Merged
merged 3 commits into from
Sep 5, 2016
Merged

Make Mapping covariant. #512

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cb2836c
Make Mapping covariant.
Aug 30, 2016
febb476
Delete outdated comment.
Aug 31, 2016
199c983
Backpeddle a bit -- Mapping key type should not be covariant.
Sep 2, 2016
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18 changes: 11 additions & 7 deletions stdlib/2.7/typing.pyi
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Original file line number Diff line number Diff line change
Expand Up @@ -176,17 +176,21 @@ class ValuesView(MappingView, Iterable[_VT_co], Generic[_VT_co]):
def __contains__(self, o: object) -> bool: ...
def __iter__(self) -> Iterator[_VT_co]: ...

class Mapping(Sized, Iterable[_KT], Container[_KT], Generic[_KT, _VT]):
class Mapping(Sized, Iterable[_KT], Container[_KT], Generic[_KT, _VT_co]):
# TODO: We wish the key type could also be covariant, but that doesn't work,
# see discussion in https://github.com/python/typing/pull/273.
@abstractmethod
def __getitem__(self, k: _KT) -> _VT: ...
def __getitem__(self, k: _KT) -> _VT_co:
...
# Mixin methods
def get(self, k: _KT, default: _VT = ...) -> _VT: ...
def get(self, k: _KT, default: _VT_co = ...) -> _VT_co: # type: ignore
...
def keys(self) -> list[_KT]: ...
def values(self) -> list[_VT]: ...
def items(self) -> list[Tuple[_KT, _VT]]: ...
def values(self) -> list[_VT_co]: ...
def items(self) -> list[Tuple[_KT, _VT_co]]: ...
def iterkeys(self) -> Iterator[_KT]: ...
def itervalues(self) -> Iterator[_VT]: ...
def iteritems(self) -> Iterator[Tuple[_KT, _VT]]: ...
def itervalues(self) -> Iterator[_VT_co]: ...
def iteritems(self) -> Iterator[Tuple[_KT, _VT_co]]: ...
def __contains__(self, o: object) -> bool: ...

class MutableMapping(Mapping[_KT, _VT], Generic[_KT, _VT]):
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16 changes: 9 additions & 7 deletions stdlib/3/typing.pyi
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Expand Up @@ -226,16 +226,18 @@ class ValuesView(MappingView, Iterable[_VT_co], Generic[_VT_co]):

# TODO: ContextManager (only if contextlib.AbstractContextManager exists)

class Mapping(Iterable[_KT], Container[_KT], Sized, Generic[_KT, _VT]):
# TODO: Value type should be covariant, but currently we can't give a good signature for
# get if this is the case.
class Mapping(Iterable[_KT], Container[_KT], Sized, Generic[_KT, _VT_co]):
# TODO: We wish the key type could also be covariant, but that doesn't work,
# see discussion in https://github.com/python/typing/pull/273.
@abstractmethod
def __getitem__(self, k: _KT) -> _VT: ...
def __getitem__(self, k: _KT) -> _VT_co:
...
# Mixin methods
def get(self, k: _KT, default: _VT = ...) -> _VT: ...
def items(self) -> AbstractSet[Tuple[_KT, _VT]]: ...
def get(self, k: _KT, default: _VT_co = ...) -> _VT_co: # type: ignore
...
def items(self) -> AbstractSet[Tuple[_KT, _VT_co]]: ...
def keys(self) -> AbstractSet[_KT]: ...
def values(self) -> ValuesView[_VT]: ...
def values(self) -> ValuesView[_VT_co]: ...
def __contains__(self, o: object) -> bool: ...

class MutableMapping(Mapping[_KT, _VT], Generic[_KT, _VT]):
Expand Down