save project

diy1.py

@@ -8,8 +8,10 @@ while True:
     if username==name and userpassword==password:
         print('登陆成功')
         break
-    else:
-        print('登陆失败')
+    if username!=name:
+        print('用户名不存在')
+    if userpassword!=password:
+        print('密码错误')
 print('换赢')