Make sure _use_relativedelta is set for unpickled

pandas/_libs/tslibs/offsets.pyx

@@ -314,11 +314,6 @@ class EndMixin(object):
         return base + off
 
 
-class BusinessMixin(object):
-    """ mixin to business types to provide related functions """
-    pass
-
-
 # ---------------------------------------------------------------------
 # Base Classes
 @cython.auto_pickle(False)
@@ -384,6 +379,8 @@ cdef class _BaseOffset(object):
             # default for prior pickles
             # See GH #7748, #7789
             state['normalize'] = False
+        if '_use_relativedelta' not in state:
+            state['_use_relativedelta'] = False
 
         if 'offset' in state:
             # Older versions Business offsets have offset attribute

pandas/compat/pickle_compat.py

@@ -62,6 +62,7 @@ def load_reduce(self):
             except:
                 pass
 
+
         # unknown exception, re-raise
         if getattr(self, 'is_verbose', None):
             print(sys.exc_info())

pandas/tseries/offsets.py

@@ -23,8 +23,7 @@
     _determine_offset,
     apply_index_wraps,
     BeginMixin, EndMixin,
-    BaseOffset,
-    BusinessMixin as _BusinessMixin)
+    BaseOffset)
 
 import functools
 import operator
@@ -157,14 +156,8 @@ def __add__(date):
 
     Since 0 is a bit weird, we suggest avoiding its use.
     """
-    _use_relativedelta = False
     _adjust_dst = False
 
-    # default for prior pickles
-    # normalize = False
-    # FIXME: without commenting this out, all
-    # DateOffsets get initialized with normalize=False, regardless of kwarg
-
     def __init__(self, n=1, normalize=False, **kwds):
         BaseOffset.__init__(self, n, normalize)
         self.kwds = kwds
@@ -415,7 +408,7 @@ def _from_name(cls, suffix=None):
         return cls()
 
 
-class BusinessMixin(_BusinessMixin):
+class BusinessMixin(object):
     """ mixin to business types to provide related functions """
 
     @property