def add_group_grant(self, permission, group_id):
        acl = self.get_acl()
        acl.add_group_grant(permission, group_id)
        self.set_acl(acl)
Convenience method that provides a quick way to add a canonical group
dataset/ETHPy150Open yyuu/botornado/boto/gs/key.py/Key.add_group_grant