Boilerplate/ minimum code needed to log keyboard and mouse activity on MacOSX. Logs only whether there was any activity or not, not the actual keys/ locations.

macosx-activity-logger-boilerplate.py

import time

from Cocoa import *
from Foundation import *
from PyObjCTools import AppHelper

last_timestamp = time.time()

class AppDelegate(NSObject):
    def applicationDidFinishLaunching_(self, aNotification):
        """Sets events to be every keyboard click and left mouse click.
        More information: http://l.hiwy.in/TJQ4qG
        """
        NSEvent.addGlobalMonitorForEventsMatchingMask_handler_(
            NSKeyDownMask, handler
        )
        NSEvent.addGlobalMonitorForEventsMatchingMask_handler_(
            NSLeftMouseDownMask, handler
        )

def handler(event):
    """Gets called every time there's an event/activity happening.
    Sets last_timestamp to the time when an event occurs.
    This can be used by a thread that's checking if there was any
    activity in the last x minutes."""
    last_timestamp = time.time()

def main():
    app = NSApplication.sharedApplication()
    delegate = AppDelegate.alloc().init()
    NSApp().setDelegate_(delegate)
    AppHelper.runEventLoop()

if __name__ == '__main__':
   main()