typing Add fake classes to typing module (Issue #190)

typing/typing.py

@@ -0,0 +1,62 @@
+class Any: pass
+class NoReturn: pass
+class ClassVar: pass
+class Union: pass
+class Optional: pass
+class Generic: pass
+class NamedTuple: pass
+class Hashable: pass
+class Awaitable: pass
+class Coroutine: pass
+class AsyncIterable: pass
+class AsyncIterator: pass
+class Iterable: pass
+class Iterator: pass
+class Reversible: pass
+class Sized: pass
+class Container: pass
+class Collection: pass
+class Callable: pass
+class AbstractSet: pass
+class MutableSet: pass
+class Mapping: pass
+class MutableMapping: pass
+class Sequence: pass
+class MutableSequence: pass
+class ByteString: pass
+class Tuple: pass
+class List: pass
+class Deque: pass
+class Set: pass
+class FrozenSet: pass
+class MappingView: pass
+class KeysView: pass
+class ItemsView: pass
+class ValuesView: pass
+class ContextManager: pass
+class AsyncContextManager: pass
+class Dict: pass
+class DefaultDict: pass
+class Counter: pass
+class ChainMap: pass
+class Generator: pass
+class AsyncGenerator: pass
+class Type: pass
+
+
+def cast(typ, val):
+    return val
+
+
+def _overload_dummy(*args, **kwds):
+    """Helper for @overload to raise when called."""
+    raise NotImplementedError(
+        "You should not call an overloaded function. "
+        "A series of @overload-decorated functions "
+        "outside a stub module should always be followed "
+        "by an implementation that is not @overload-ed."
+    )
+
+
+def overload():
+    return _overload_dummy