def __repr__(self):
        return self.func.__doc__
delete repeated items in a list, and keep the order.
dataset/ETHPy150Open Axelrod-Python/Axelrod/axelrod/_strategy_utils.py/Memoized.__repr__--crossover with--dataset/ETHPy150Open cnbeining/Biligrab/biligrab.py/list_del_repeat