code: def concat_same_type(self, to_concat, placement=None):
          
          values = self._holder._concat_same_type(
              [blk.values for blk in to_concat])
          placement = placement or slice(0, len(values), 1)
          return self.make_block_same_class(values, ndim=self.ndim,
                                            placement=placement)
docs: Concatenate list of single blocks of the same type.