code: def parameters_signature(self):
          '''
              Return the parameters signature(without the return statetement)
          '''
          # Use x.type
          # x.name may be empty
          params = ",".join([str(x.type) for x in self._params])
          return '({})'.format(paramsf parameters_signature(self):
          '''
              Return the parameters signature(without the return statetement)
          '''
          # Use x.type
          # x.name may be empty
          params = ",".join([str(x.type) for x in self._params])
          return '({})'.format(params)
docs: Return the parameters signature(without the return statetement)