save project

diy2.py

@@ -6,9 +6,12 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
+        elif expression:
+            
     if name!=username:
         print("用户不存在，请重新输入！")
-        continue
+        
+    else
     if password!=userpassword:
         print("密码输入有误，请重新输入！")
 print("欢迎来到贝尔编程!")