auto save

diy2.py

@@ -5,4 +5,6 @@ while True:
     password = input("请输入密码:")
     if name == username and password == userpassword:
         print("登录成功!")
-            
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+        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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