"""Misc helper functions."""

import itertools


def grouper(n, iterable):
    """Split iterable into n-sized iterable chunks.

    Args:
        n (int): chunk size
        iterable (iter): iterable sequence to split

    Yields:
        iterable chunk of size "n"

    """
    it = iter(iterable)
    while True:
        chunk_it = itertools.islice(it, n)
        try:
            first_el = next(chunk_it)
        except StopIteration:
            return
        yield itertools.chain((first_el,), chunk_it)