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

One of the less well known features of Python is that you can have more for clauses in a generator expression. Very useful for flattening nested lists, like those you get from zip()/izip().

def imerge(*iterators):
    return (value for row in itertools.izip(*iterators) for value in row)