save project

diy2.py

@@ -6,5 +6,8 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
-    if 
+    if name!=usename:
+        print("账户不存在，请重新输入！")
+    if password!=userpassword:
+        print("密码错误，请重新输入！")
 print("欢迎来到贝尔编程!")
\ No newline at end of file