auto save

diy2.py

-username = "python"
+username = "py"
 userpassword = "123456"
 while True:
     name = input("请输入用户名:")
     password = input("请输入密码:")
     if name == username and password == userpassword:
         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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