convert Dtype to TypeVar

vaibhavhrt · vaibhavhrt · commit 9821eed9ba80 · 2019-06-06T15:05:04.000+05:30
diff --git a/pandas/_typing.py b/pandas/_typing.py
@@ -19,5 +19,5 @@
                        np.ndarray)
 ArrayLike = TypeVar('ArrayLike', ABCExtensionArray, np.ndarray)
 DatetimeLikeScalar = Type[Union[Period, Timestamp, Timedelta]]
-Dtype = Union[str, np.dtype, ExtensionDtype]
+Dtype = TypeVar('Dtype', str, np.dtype, ExtensionDtype)
 FilePathOrBuffer = Union[str, Path, IO[AnyStr]]
