How to convert list of tuples into a single list of unique values ?

[Alex Martelli]

"Paul Rubin" <phr-n2002a at nightsong.com> wrote in message
news:7x4rludzwn.fsf at ruckus.brouhaha.com...
> pekka niiranen <krissepu at vip.fi> writes:
> > I have a list of equal size tuples, but a tuple may contain empty
values:
> >
> > t = [ ( a,b,c), (d, ,f) (b,a,j) ]
> >
> > How can I convert it into a single list of unique values:
                                               ******
> >
> > l = [a,b,c,d,f,j]
> >
> > No lambdas, please
>
> I don't think (d, ,f) is syntactically valid.  Other than that,
> is something wrong with
>    import operator
>    l = operator.add(*t)

This doesn't answer the "unique" specification (in the example, items
b and a occur in the last tuple, but not in the result as they would
not be unique).


Alex