save project

diy2.py

@@ -5,5 +5,8 @@ while True:
     password = input("请输入密码:")
     if name == username and password == userpassword:
         print("登录成功!")
-    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!")
\ No newline at end of file