Python How to I check if last element has been reached in iterator tool chain?

Question

for elt in itertools.chain.from_iterable(node):

if elt is the last element:
  do statement

How do I achieve this

Answer 1

You can't per se. You'd need to store the current item, advance the iterator, and catch the StopIteration exception. And then you'd need to somehow signal that you have the last item.