code: def add_group_maintainer(self, name, user):
          
          self.service.add_group_maintainer(
              name, user, self.url_prefix, self.auth, self.session,
              self.session_send_opts)
docs: Add the given user to the named group.
  
          Both group and user must already exist for this to succeed.
  
          Args:
              name (string): Name of group.
              user (string): User to add to group.
              version (optional[string]): Version of the Boss API to use.  Defaults to the latest supported version.
  
          Raises:
              requests.HTTPError on failure.