Add dict views to python 2 (#376)

stdlib/2.7/__builtin__.pyi

@@ -8,7 +8,7 @@ from typing import (
     Sequence, Mapping, Tuple, List, Any, Dict, Callable, Generic, Set,
     AbstractSet, Sized, Reversible, SupportsInt, SupportsFloat, SupportsAbs,
     SupportsRound, IO, BinaryIO, Union, AnyStr, MutableSequence, MutableMapping,
-    MutableSet
+    MutableSet, ItemsView, KeysView, ValuesView
 )
 from abc import abstractmethod, ABCMeta
 
@@ -546,6 +546,9 @@ class dict(MutableMapping[_KT, _VT], Generic[_KT, _VT]):
     def iterkeys(self) -> Iterator[_KT]: ...
     def itervalues(self) -> Iterator[_VT]: ...
     def iteritems(self) -> Iterator[Tuple[_KT, _VT]]: ...
+    def viewkeys(self) -> KeysView[_KT]: ...
+    def viewvalues(self) -> ValuesView[_VT]: ...
+    def viewitems(self) -> ItemsView[_KT, _VT]: ...
     @staticmethod
     @overload
     def fromkeys(seq: Sequence[_T]) -> Dict[_T, Any]: ...  # TODO: Actually a class method

stdlib/2.7/typing.pyi

@@ -43,6 +43,7 @@ _KT = TypeVar('_KT')  # Key type.
 _VT = TypeVar('_VT')  # Value type.
 _T_co = TypeVar('_T_co', covariant=True)  # Any type covariant containers.
 _V_co = TypeVar('_V_co', covariant=True)  # Any type covariant containers.
+_KT_co = TypeVar('_KT_co', covariant=True)  # Key type covariant containers.
 _VT_co = TypeVar('_VT_co', covariant=True)  # Value type covariant containers.
 _T_contra = TypeVar('_T_contra', contravariant=True)  # Ditto contravariant.
 
@@ -157,6 +158,21 @@ class MutableSet(AbstractSet[_T], Generic[_T]):
     def __ixor__(self, s: AbstractSet[_S]) -> MutableSet[Union[_T, _S]]: ...
     def __isub__(self, s: AbstractSet[Any]) -> MutableSet[_T]: ...
 
+class MappingView(Sized):
+    def __len__(self) -> int: ...
+
+class ItemsView(AbstractSet[Tuple[_KT_co, _VT_co]], MappingView, Generic[_KT_co, _VT_co]):
+    def __contains__(self, o: object) -> bool: ...
+    def __iter__(self) -> Iterator[Tuple[_KT_co, _VT_co]]: ...
+
+class KeysView(AbstractSet[_KT_co], MappingView, Generic[_KT_co]):
+    def __contains__(self, o: object) -> bool: ...
+    def __iter__(self) -> Iterator[_KT_co]: ...
+
+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]):
     @abstractmethod
     def __getitem__(self, k: _KT) -> _VT: ...

stdlib/3/typing.pyi

@@ -169,7 +169,7 @@ class MutableSequence(Sequence[_T], Generic[_T]):
     def remove(self, object: _T) -> None: ...
     def __iadd__(self, x: Iterable[_T]) -> MutableSequence[_T]: ...
 
-class AbstractSet(Iterable[_KT_co], Container[_KT_co], Sized, Generic[_KT_co]):
+class AbstractSet(Iterable[_T_co], Container[_T_co], Sized, Generic[_T_co]):
     @abstractmethod
     def __contains__(self, x: object) -> bool: ...
     # Mixin methods
@@ -177,10 +177,10 @@ class AbstractSet(Iterable[_KT_co], Container[_KT_co], Sized, Generic[_KT_co]):
     def __lt__(self, s: AbstractSet[Any]) -> bool: ...
     def __gt__(self, s: AbstractSet[Any]) -> bool: ...
     def __ge__(self, s: AbstractSet[Any]) -> bool: ...
-    def __and__(self, s: AbstractSet[Any]) -> AbstractSet[_KT_co]: ...
-    def __or__(self, s: AbstractSet[_T]) -> AbstractSet[Union[_KT_co, _T]]: ...
-    def __sub__(self, s: AbstractSet[Any]) -> AbstractSet[_KT_co]: ...
-    def __xor__(self, s: AbstractSet[_T]) -> AbstractSet[Union[_KT_co, _T]]: ...
+    def __and__(self, s: AbstractSet[Any]) -> AbstractSet[_T_co]: ...
+    def __or__(self, s: AbstractSet[_T]) -> AbstractSet[Union[_T_co, _T]]: ...
+    def __sub__(self, s: AbstractSet[Any]) -> AbstractSet[_T_co]: ...
+    def __xor__(self, s: AbstractSet[_T]) -> AbstractSet[Union[_T_co, _T]]: ...
     # TODO: Argument can be a more general ABC?
     def isdisjoint(self, s: AbstractSet[Any]) -> bool: ...