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

I'd do something like this. This will be most time and space efficient, since you won't have the overhead of zipping objects together. This will also work if both a and b are infinite.

def imerge(a, b):
    i1 = iter(a)
    i2 = iter(b)
    while True:
        try:
            yield i1.next()
            yield i2.next()
        except StopIteration:
            return