how to retreive the body text alone of a webpage

hi
I am writing an application to find out if the body text of a web
page of given url has been modified-added or removed.Is there some way
to find out the length of body text alone?
I wrote a function that can read and return the data length.But is
there some way I can read the body text alone ?The idea is to ignore
length change due to tracking id etc that comes with the page and
take into account only the body text.

def get_page_data(url):
f=urllib.urlopen(url)
return len(f.read())

Any help appreciated
thanks
jim

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