API: Fixed pickle

Author: TomAugspurger

pandas/core/categorical.py

@@ -1051,6 +1051,11 @@ def __setstate__(self, state):
             else:
                 state['_ordered'] = False
 
+        # 0.21.0 CategoricalDtype change
+        if '_dtype' not in state:
+            state['_dtype'] = CategoricalDtype(state['_categories'],
+                                               state['_ordered'])
+
         for k, v in compat.iteritems(state):
             setattr(self, k, v)
 

pandas/io/pickle.py

@@ -74,7 +74,6 @@ def read_pickle(path, compression='infer'):
     """
     path = _stringify_path(path)
     inferred_compression = _infer_compression(path, compression)
-    # import pdb; pdb.set_trace()
 
     def read_wrapper(func):
         # wrapper file handle open/close operation