[Zope] Dupe checking a list of tuples

[abg@comco-inc.com]

Is it possible to remove duplicate records from a list of tuples?

Here's a sample of my list. I'd like to make sure a url doesn't occur twice
in the list, and delete the offending tuple if it does.

[('http://www.news.com/frontdoor/0-1.html?tag=hd_ts', 'CNET'),
('http://www.news.com/shopping/0-1257.html?tag=hd_ts', 'Price
comparisons')]

I'm sorry if this is elementary, but I'm fairly new to Python and have been
pulling my hair out on this one.

Thanks,

Aaron Gillette
abg@comco-inc.com