验证登陆.笔记

# _user = "alex"
# _passwd = "abc123"
#
# counter = 0
# while counter < 3:  #当 while 后面的条件成立（True），才会执行下面的代码
#
#     username = input("Username:")
#     password = input("Password:")
#     if username == _user and password == _passwd:
#         print("Welcome %s login...." % _user)
#         break  # 跳出，中断
#     else:
#         print("Invalid username or password !")
#     counter += 1
# else:
#     print("滚")


_user = "alex"
_passwd = "abc123"

counter = 0
while counter < 3:  #当 while 后面的条件成立（True），才会执行下面的代码

    username = input("Username:")
    password = input("Password:")
    if username == _user and password == _passwd:
        print("Welcome %s login...." % _user)
        break  # 跳出，中断
    else:
        print("Invalid username or password !")
    counter += 1
    if counter == 3:
        keep_going_choice = input("还来吗？【y/n】")
        if keep_going_choice == "y":
            counter = 0
else:
    print("滚")