[Tutor] auto referer handler/opener for urlib2?

[xbmuncher]

I was reading about urllib2 openers.. Can I make any kind of def or function
and make the urllib2 "urlopen" function run through this function first
before opening a url? For example, something like a reporthook function.
What I want to do is this:

def autoReferer(handle):
if handle.lastRequest.url != None:
handle.addheader('referer' : handle.lastRequest.url)


How can make this auto referer functionality with urllib2?
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