use ABCDataFrame instead of 'DataFrame'

vaibhavhrt · vaibhavhrt · commit e413504ccf60 · 2019-07-25T16:35:31.000+05:30
diff --git a/pandas/core/frame.py b/pandas/core/frame.py
@@ -396,7 +396,7 @@ def _constructor_expanddim(self):
 
     def __init__(self,
                  data: Optional[Union[np.ndarray, dict,
-                                      'DataFrame']] = None,
+                                      ABCDataFrame]] = None,
                  index: Optional[Axes] = None,
                  columns: Optional[Axes] = None,
                  dtype: Optional[Dtype] = None,
