pxss.py is a replacement of PyXSS/src/__init__.py, but not entire PyXSS. You can have IdleTracker, XSSTracker, and get_info(), and thats all.

It accesses libXss.so via ctypes. You only need to put it with your script without installation or compilation.

A quick example of getting the idle time:

import pxss
print pxss.get_info().idle, 'ms'

The get_info() returns the same data as in PyXSS.

If you have another display, you should be able to pass it (after you open it) with other necessary variables to get_info():

def get_info(p_display=None, default_root_window=None, p_info=None):

and get the XScreenSaverInfo.

I made this is for my another helper script, its quality is very poor. If you are interested in ctypes, this script might give your some ideas. But this is only my second time to use ctypes. My first time was on Windows for accessing GDI+.