code: def modify_parameter_group(self, name, parameters=None):
          
          params = {'DBParameterGroupName': name}
          for i in range(0, len(parameters)):
              parameter = parameters[i]
              parameter.merge(params, i+1)
          return self.get_list('ModifyDBParameterGroup', params,
                               ParameterGroup, verb='POST')
docs: Modify a parameter group for your account.
  
          :type name: string
          :param name: The name of the new parameter group
  
          :type parameters: list of :class:`boto.rds.parametergroup.Parameter`
          :param parameters: The new parameters
  
          :rtype: :class:`boto.rds.parametergroup.ParameterGroup`
          :return: The newly created ParameterGroup