code: def get_is_group_member(self, grp_name, user):
          
          self.project_service.set_auth(self._token_project)
          return self.project_service.get_is_group_member(grp_name, user)
docs: Check if the given user is a member of the named group.
  
          Note that a group maintainer is not considered a member unless the
          user is also explicitly added as a member.
  
          Args:
              name (string): Name of group.
              user_name (string): User of interest.
  
          Returns:
              (bool): False if user not a member.