Detect workstation/System Screen Lock using Python(ubuntu)

Question

Is there anyway that we can detect when the system/screen gets locked and notify some event to trigger in Ubuntu ?

Answer 1

There is a possibility to be notified when the screen becomes locked/unlocked with DBus, this is reference on GnomeScreensaver showing the basics of it.

I am not DBus expert, but there are bindings for python, so you can listen for DBus events in python. Combinig the two, you should be able to get what you want:-).

Here is a python-dbus programming tutorial on wikibooks.