save project

diy2.py

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