"ast" <nomail at invalid.com> a écrit dans le message de news:56defc8e$0$3341$426a74cc at news.free.fr... > Hello > >>>> lst = [(1,2,3), (4, 5,6)] >>>> sum(lst, ()) > (1, 2, 3, 4, 5, 6) > > Any explanations ? > thx OK, sorry, I finally understand. This is because adding tuple (or list or string ...) is a concatenation () + (1,2,3) + (4, 5,6) (1,2,3,4,5,6)