There's no Linux equivalent for that. Linux, unlike Windows, has no gui stuff inbuilt on the kernel. You will need to pick up some API as gtk or qt and start coding. GTK has an extension for python, I don't know if QT has. Check out their sites:
If you really just have to use Win32 API, check out Wine:
wine is supposed to translate Win32 API in Linux, thus making Win32 applications and games to actually run in Linux.