setting template variables from plugins/ unkludging code/

Hi, I'm a new user of pyblosxom, and I wanted to know how to set template
variables from a plugin. I currently have the chunk of python code:

import os
from xml.dom import minidom

username = "putusernamehere"
password = "putpasswordhere"
getxml="curl -u %s:%s http://twitter.com/statuses/user_timeline.xml?count=1>
tmptwit.xml" % (username,password)
os.system(getxml)

ourxml=minidom.parse("tmptwit.xml")
currentstatus=ourxml.childNodes
[0].childNodes[1].childNodes[5].childNodes[0].data
py['twitterstatus']=currentstatus


which functions when placed in config.py, but this is obviously not how it
should be done.  I'm working in a controlled hosting environment, so I don't
have pyblosxom installed as a module (as in I'm using py["codebase"]).

P.S. : if I wanted to write some simple cache code, how would I just do a
check for a file age of 60 seconds?

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