code: def delete_group_member(self, grp_name, user):
          
          self.project_service.set_auth(self._token_project)
          self.project_service.delete_group_member(grp_name, user)
docs: Delete 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_name (string): User to delete from the group.
  
          Raises:
              requests.HTTPError on failure.