save project

diy2.py

@@ -6,5 +6,8 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
-    print("用户名和密码错误!请重新输入")
+    if name != username:
+        print("用户名不存在！")
+    if password !=userpassword:
+        print("密码错误")
 print("欢迎来到贝尔编程!")