On Mon, Mar 3, 2014 at 10:45 PM, Rustom Mody <rustompmody at gmail.com> wrote: > - cannot do a 'type-incorrect' expression like >>>> [1,2] + [[3,4],[5]] > [1, 2, [3, 4], [5]] What do you mean by "type-incorrect"? This is adding two lists and getting back a list. Seems perfectly correct to me. ChrisA