We’re talkin’ Jython 2.7! You could try newer, but the rule engine may need some tweaking. There’s a short comparison at the bottom of this page… WhyJython - JythonWiki.
This one is a little dated… http://www.jython.org/docs/library/indexprogress.html.
So, yes… you can import Python 2.7 libraries in your scripts and modules. The best part is that you can also import Java libraries, like I did here with org.eclipse.smarthome.core.items.Metadata.