auto save

diy2.py

@@ -6,8 +6,8 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
-    if name != username:
+    elif  name != username:
         print("用户名错误")
-    if password != userpassword:
+    else: 
         print("用户名和密码错误!请重新输入")
 print("欢迎来到贝尔编程!")