I might be misunderstanding OP but: a+b+c+d+e is simple way of concatenating 5 lists...
as a function that takes any amount of lists and concatenates them: def concat(*args): c = [] for elem in args: c += elem return c don't know if extend is faster or slower or the same as + : def concat(*args): c = [] for elem in args: c.extend(elem) return c I don't know of a built-in. -- http://mail.python.org/mailman/listinfo/python-list