save project

diy2.py

@@ -6,6 +6,7 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
+    print("账号和密码错误！")
     if name==username and password!=userpassword:
         print("密码错误")
     if password==userpassword and name!=username: