auto save

diy2.py

@@ -6,9 +6,10 @@ 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")
-    else :
+    elif password != userpassword :
         print("密码错误")
+    else:
     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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