remove DatetimeTZBlock.shift

Author: TomAugspurger

pandas/core/internals/blocks.py

@@ -3095,32 +3095,6 @@ def _try_coerce_result(self, result):
     def _box_func(self):
         return lambda x: tslibs.Timestamp(x, tz=self.dtype.tz)
 
-    def shift(self, periods, axis=0, fill_value=None):
-        """ shift the block by periods """
-
-        # think about moving this to the DatetimeIndex. This is a non-freq
-        # (number of periods) shift ###
-
-        N = len(self)
-        indexer = np.zeros(N, dtype=int)
-        if periods > 0:
-            indexer[periods:] = np.arange(N - periods)
-        else:
-            indexer[:periods] = np.arange(-periods, N)
-
-        new_values = self.values.asi8.take(indexer)
-
-        if isna(fill_value):
-            fill_value = tslibs.iNaT
-        if periods > 0:
-            new_values[:periods] = fill_value
-        else:
-            new_values[periods:] = fill_value
-
-        new_values = self.values._shallow_copy(new_values)
-        return [self.make_block_same_class(new_values,
-                                           placement=self.mgr_locs)]
-
     def diff(self, n, axis=0):
         """1st discrete difference