auto save

diy2.py

-username ="python"
-usernpassword ="123456"
-while True:
-    name =input("请输入用户名:")
-    password = input("请输入密码:")
-    if name ==username and password ==usernpassword:
-        print("登录成功")
-        break
-    print("用户名和密码错误！请重新输入")
-print("欢迎来到贝尔编程！")
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