code: def allocate_address(self):
          
          # XXX remove empty other_params
          query = self.query_factory(
              action="AllocateAddress", creds=self.creds, endpoint=self.endpoint,
              other_params={})
          d = query.submit()
          return d.addCallback(self.parser.allocate_address)
docs: Acquire an elastic IP address to be attached subsequently to EC2
          instances.
  
          @return: the IP address allocated.