Python小练习007

编写一个简易的登陆程序。

#通过for循环

#系统默认的用户名和密码，可实现自由添加
_user = "xiaosu"
_password = "123456"

for i in range(3):
    username = input("Username:")
    password = input("Password:")
    if username == _user and password == _password:
        print("Welcome %s login..." % _user)
        break
    else:
        print("Invalid username or password!")
else:#只要for循环正常执行完毕，中间未被打断，则执行此else语句
        print("输入错误超过3次，禁止输入！")

#通过while循环

#系统默认的用户名和密码，可实现自由添加
_user = "xiaosu"
_password = "123456"

count = 3
while count > 0:
    username = input("Username:")
    password  = input("Password:")
    if username == _user and password == _password:
        print("Welcome %s login..." % _user)
        break
    else:
        print("Invalid username or password")
    count -= 1
    if count == 0:
        restart = input("还想继续输入吗？[Y/N]")
        if restart == 'Y' or 'y':
            count = 3
else:
    print("输入错误超过3次，禁止输入！")