CLN: remove Index __setstate__ methods

pandas/core/indexes/base.py

@@ -1726,35 +1726,6 @@ def __reduce__(self):
         d.update(self._get_attributes_dict())
         return _new_Index, (type(self), d), None
 
-    def __setstate__(self, state):
-        """
-        Necessary for making this object picklable.
-        """
-
-        if isinstance(state, dict):
-            self._data = state.pop("data")
-            for k, v in state.items():
-                setattr(self, k, v)
-
-        elif isinstance(state, tuple):
-
-            if len(state) == 2:
-                nd_state, own_state = state
-                data = np.empty(nd_state[1], dtype=nd_state[2])
-                np.ndarray.__setstate__(data, nd_state)
-                self._name = own_state[0]
-
-            else:  # pragma: no cover
-                data = np.empty(state)
-                np.ndarray.__setstate__(data, state)
-
-            self._data = data
-            self._reset_identity()
-        else:
-            raise Exception("invalid pickle state")
-
-    _unpickle_compat = __setstate__
-
     # --------------------------------------------------------------------
     # Null Handling Methods
 

pandas/core/indexes/datetimes.py

@@ -319,41 +319,6 @@ def __reduce__(self):
         d.update(self._get_attributes_dict())
         return _new_DatetimeIndex, (type(self), d), None
 
-    def __setstate__(self, state):
-        """
-        Necessary for making this object picklable.
-        """
-        if isinstance(state, dict):
-            super().__setstate__(state)
-
-        elif isinstance(state, tuple):
-
-            # < 0.15 compat
-            if len(state) == 2:
-                nd_state, own_state = state
-                data = np.empty(nd_state[1], dtype=nd_state[2])
-                np.ndarray.__setstate__(data, nd_state)
-
-                freq = own_state[1]
-                tz = timezones.tz_standardize(own_state[2])
-                dtype = tz_to_dtype(tz)
-                dtarr = DatetimeArray._simple_new(data, freq=freq, dtype=dtype)
-
-                self.name = own_state[0]
-
-            else:  # pragma: no cover
-                data = np.empty(state)
-                np.ndarray.__setstate__(data, state)
-                dtarr = DatetimeArray(data)
-
-            self._data = dtarr
-            self._reset_identity()
-
-        else:
-            raise Exception("invalid pickle state")
-
-    _unpickle_compat = __setstate__
-
     def _convert_for_op(self, value):
         """
         Convert value to be insertable to ndarray.

pandas/core/indexes/period.py

@@ -826,36 +826,6 @@ def _apply_meta(self, rawarr):
             rawarr = PeriodIndex._simple_new(rawarr, freq=self.freq, name=self.name)
         return rawarr
 
-    def __setstate__(self, state):
-        """Necessary for making this object picklable"""
-
-        if isinstance(state, dict):
-            super().__setstate__(state)
-
-        elif isinstance(state, tuple):
-
-            # < 0.15 compat
-            if len(state) == 2:
-                nd_state, own_state = state
-                data = np.empty(nd_state[1], dtype=nd_state[2])
-                np.ndarray.__setstate__(data, nd_state)
-
-                # backcompat
-                freq = Period._maybe_convert_freq(own_state[1])
-
-            else:  # pragma: no cover
-                data = np.empty(state)
-                np.ndarray.__setstate__(self, state)
-                freq = None  # ?
-
-            data = PeriodArray(data, freq=freq)
-            self._data = data
-
-        else:
-            raise Exception("invalid pickle state")
-
-    _unpickle_compat = __setstate__
-
     def memory_usage(self, deep=False):
         result = super().memory_usage(deep=deep)
         if hasattr(self, "_cache") and "_int64index" in self._cache:

pandas/core/indexes/timedeltas.py

@@ -202,17 +202,6 @@ def _simple_new(cls, values, name=None, freq=None, dtype=_TD_DTYPE):
         result._reset_identity()
         return result
 
-    # -------------------------------------------------------------------
-
-    def __setstate__(self, state):
-        """Necessary for making this object picklable"""
-        if isinstance(state, dict):
-            super().__setstate__(state)
-        else:
-            raise Exception("invalid pickle state")
-
-    _unpickle_compat = __setstate__
-
     # -------------------------------------------------------------------
     # Rendering Methods