save project

diy2.py

@@ -4,8 +4,10 @@ while True:
     name = input("请输入用户名:")
     password = input("请输入密码:")
     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")
+    elif name != username:
+        print("用户不存在,请重新输入")
+    else:
+        print("用户名和密码错误!请重新输入")
 print("欢迎来到贝尔编程!")
\ No newline at end of file