code: def update_group(self, group_name, new_group_name=None, new_path=None):
          
          params = {'GroupName' : group_name}
          if new_group_name:
              params['NewGroupName'] = new_group_name
          if new_path:
              params['NewPath'] = new_path
          return self.get_response('UpdateGroup', params)
docs: Updates name and/or path of the specified group.
  
          :type group_name: string
          :param group_name: The name of the new group
  
          :type new_group_name: string
          :param new_group_name: If provided, the name of the group will be
                                 changed to this name.
  
          :type new_path: string
          :param new_path: If provided, the path of the group will be
                           changed to this path.