<p>If possible I want to catch pressure sensitive input from a Wacom tablet in Python. Are there any Python libraries available that can do this?</p>

You could perhaps take a look at the
software
described
here
. It is a gnome applet, written in Python.
From the web site:
"The gnome wacom applet is a small gnome panel applet that shows how much pressure is being applied to your wacom tablet by the current device. Clicking on the panel icon brings up a dialog allowing you to select a different device and check what pressure and tilt information is being recieved from it. This dialog also contains a small drawing test area to give your pen a quick test."
Google is your friend