code: def unmap_by_address(self, absolute_address):
          
  
          desc = self._address_to_region_id[absolute_address]
          del self._address_to_region_id[absolute_address]
          del self._region_id_to_address[desc.region_id]
docs: Removes a mapping based on its absolute address.
  
          :param absolute_address: An absolute address