How do I merge two python iterators?

Question

I have two iterators, a list and an itertools.count object (i.e. an infinite value generator). I would like to merge these two into a resulting ite

Answer 1

Why is itertools needed?

def imerge(a,b):
    for i,j in zip(a,b):
        yield i
        yield j

In this case at least one of a or b must be of finite length, cause zip will return a list, not an iterator. If you need an iterator as output then you can go for the Claudiu solution.