day05_06 continue语句、while循环

输入满3次跳出,然后留一句话

for i in range(3):

    username = input("Username:")

    password = input("Password:")

    if username == _user and password == _passwd:

        print("Welcome %s login..." %_user)

        passed_authentication = True

        break

    else:

        print("Invalid username or password")

if not passed_authentication :

    print("您的输出次数已经满3次,拜拜")

　　方法二

for i in range(3):

    username = input("Username:")

    password = input("Password:")

    if username == _user and password == _passwd:

        print("Welcome %s login..." %_user)

        break

    else:

        print("Invalid username or password")

if i == 2 :

    print("您的输出次数已经满3次,拜拜")

　　方法三

for i in range(3):

    username = input("Username:")

    password = input("Password:")

    if username == _user and password == _passwd:

        print("Welcome %s login..." %_user)

        break

    else:

        print("Invalid username or password")

if i == 2 :

    print("您的输出次数已经满3次,拜拜")

　　只要上面的for循环正常执行完毕,中间没有被打断(break),就会执行else语句,break过后,就不会执行后面的else语句

这个用法python特有

while死循环

while True:

    print("dang")

_user = "alex"

_passwd = "abc123"

counter = 0

while counter < 3 :

    username = input("请输入您的姓名:")

    password = input("请输入您的密码:")

    if username == _user and password == _passwd :

        print("welcome %s login..." %_user)

        break

    else:

        print("您输入的账号或者密码错误,请重新输入")

    counter += 1

else:

    print("请的输入次数已满3次,拜拜啦")

while之后也可以加上else

如果想测试程序,可以使用debug测试

输入三次后让用户选择是否需要继续玩?

_user = "alex"

_passwd = "abc123"

counter = 0

while counter < 3 :

    username = input("请输入您的姓名:")

    password = input("请输入您的密码:")

    if username == _user and password == _passwd :

        print("welcome %s login..." %_user)

        break

    else:

        print("您输入的账号或者密码错误,请重新输入")

    counter += 1

    if counter == 3:

        keep_going_choice = input("还想玩买?y/n")

        if keep_going_choice == 'y':

            counter = 0

else:

    print("请的输入次数已满3次,拜拜啦")

巴特西

day05_06 continue语句、while循环

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