On Saturday, November 22, 2014 10:20:36 AM UTC+5:30, Chris Angelico wrote: > On Sat, Nov 22, 2014 at 3:43 PM, Steven D'Aprano wrote: > > random832 wrote: > > > >> There's no reason not to allow it with tuples, but you can't do it. > >> Mainly because doing it in a single literal would require special > >> syntax, whereas you can simply append to a list a reference to itself. > > > > You can't append a list to itself in a single expression, you have to create > > the list first. > > It's possible to have a list directly refer to itself: > > lst = [] > lst.append(lst)
Thats not a single expression; which is possible with a lazy evaluation language like Haskell. Prelude> let ones = 1 : ones Prelude> ones [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, <until the Control-C> -- https://mail.python.org/mailman/listinfo/python-list
