Python入门之练习题

Posted 2020-10-27

• 写循环猜年龄程序，猜错三次则打印提示信息并退出循环，猜对也打印提示信息并退出循环

count=0
while count < 3:
    num = input("猜年龄游戏：")
    guess = int(num)
    if guess == 18:
        print("恭喜你猜对了")
    elif guess > 18:
        print("大了")
    elif guess < 18:
        print("小了")
    count += 1
else:
    print("猜了三次都没猜对‘")

• 写while循环嵌套的小例子，用一个tag控制所有while循环的退出

count=0
tag="True"
while True:
    if count >= 3:
        tag="False"
        break
    username = input("请输入用户名：")
    password = input("请输入密码：")
    if username == "hello" and password == "123":
        print("登录成功")
        while True:
            if count >= 3:
                print("猜了三次也没猜中！")
                break
            print("猜数字：")
            guess=int(input("请输入一个数字："))
            if guess == 18:
                print("猜对了")
            elif guess > 18:
                print("大了")
            else:
                print("小了")
            count += 1
    else:
        print("用户名不存在或密码错误！")
        count +=1