求列表数字的平均值（去掉最大值与最小值）

def main(scores):
    min_score = max_score = scores[0]
    total = 0
    for score in scores:
        if score > max_score:
            max_score = score
        elif score < min_score:
            min_score = score
    scores.remove(max_score)
    scores.remove(min_score)

    for score in scores:
       total += score
    return total / len(scores)

if __name__ == '__main__':
    list1 = [1,2,3,4,5,6,7,8]
    y = main(list1)
    print("平均成绩: %.2f"% y)