auto save

diy2.py

@@ -6,9 +6,9 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
-    if name !=username:
+    elif name !=username:
         print("用户名不存在，请重新输入！")
-        continue
-    if password != userpassword:    
+    elif:
+         password != userpassword:    
         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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