On Dec 13, 8:37 am, mattia <ger... at gmail.com> wrote: > How can I insert non-duplicate data in a list? I mean, is there a > particular option in the creation of a list that permit me not to use > something like: > def append_unique(l, val): > if val not in l: > l.append(val) > > Thanks, > Mattia Check out the set() data type. ~Sean