auto save

diy2.py

@@ -6,8 +6,5 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
-    if name!=username:
-       print("用户名不存在，请重新输入")
-    if password!=userpassword:
-       print("密码输入错误请，重新输入")          
+    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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