code: def set_block_entity_data(self, pos_or_x, y=None, z=None, data=None):
          
          if None not in (y, z):  # x y z supplied
              pos_or_x = pos_or_x, y, z
          coord_tuple = tuple(int(floor(c)) for c in pos_or_x)
          old_data = self.block_entities.get(coord_tuple, None)
          self.block_entities[coord_tuple] = data
          return old_data
docs: Update block entity data.
  
          Returns:
              Old data if block entity data was already stored for that location,
              None otherwise.