save project

diy2.py

@@ -6,7 +6,7 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
-    if != username:
+    if name != username:
         print("用户名不存在,请重新输入")
     if password != userpassword:
         print("密码错误,请重新输入")