Alternating between iterators in Python [duplicate]

Answer 1

There are two problems with your attempt:

1. You don't wrap each object in iters with iter() so it will fail with iterables such as list; and
2. By passing on StopIteration your generator is an infinite loop.

Some simple code that does solves both those issues and is still easy to read and understand:

def alternate(*iters):
    iters = [iter(i) for i in iters]
    while True:
        for i in iters:
            yield next(i)

>>> list(alternate(range(1, 7, 2), range(2, 8, 2)))
[1, 2, 3, 4, 5, 6]