要求：

1、輸入用戶名和密碼

2、認證成功後顯示歡迎信息

3、輸錯三次鎖定

Python實現代碼如下：

# -*- coding: UTF-8 -*-
C = 0
name = "quan"
passed = 123
while C < 3:
    username = input("username:")
    password = int (input("password:"))
    if username == name and password == passed:
        print("welcome!")
        break
    C = C + 1
    if C == 3:
 

        print("you Enter the wrong lock three times！")

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