Tip of the Day: Combining Iterables in Python Through Round Robin

from itertools import cycle, islice


def roundrobin(*iterables):
    """Takes iterables and selects one item from each in equal portions and in circular order.

    https://docs.python.org/3.1/library/itertools.html#recipes

    >>> list(roundrobin("ABC", [1,2,3], (4,5)))
    ['A', 1, 4, 'B', 2, 5, 'C', 3]
    """
    pending = len(iterables)
    nexts = cycle(iter(it).__next__ for it in iterables)
    while pending:
        try:
            for next in nexts:
                yield next()
        except StopIteration:
            pending -= 1
            nexts = cycle(islice(nexts, pending))