On Fri, Nov 21, 2014, at 02:00, Marko Rauhamaa wrote: > Gill Shen <gillar...@gmail.com>: > > > How is this [nesting] behavior implemented under the hood? > > Pointers. > > > And why is this allowed at all? > > There's no reason not to.
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. I think I tried on at least one python version and printing the tuple crashed with a recursion depth error, since it had no special protection for this case the way list printing does. -- https://mail.python.org/mailman/listinfo/python-list
