code: def _append_to_label(self, element):
          
          if len(self.address_label) > 0\
                  and self._is_exception_rule(self.address_label[-1]):
              self.address_label[-1] += (' ' + element)
          else:
              self.address_label.append(element)
docs: Append address element to the label.
  
          Normally an element will be appended onto the list, except where the
          existing last element fulfils the exception rule, in which case the
          element will be concatenated onto the final list member.