Different options to chunk sequences or iterables

chunk.py

from itertools import chain, islice, zip_longest
# izip_longest in python2

def grouper(iterable, n, fillvalue=None):
    """
    # https://stackoverflow.com/a/434411
    
    >>> aaa = [1, 2, 3, 5, 6, 1, 3, 4, 8, 2094283, 123]
    >>> [_ for _ in grouper(aaa, 3)]
    [(1, 2, 3), (5, 6, 1), (3, 4, 8), (2094283, 123, None)]
    """
    args = [iter(iterable)] * n
    return zip_longest(*args, fillvalue=fillvalue)


def chunker(seq, size):
    """
    # https://stackoverflow.com/a/434328
    
    >>> aaa = [1, 2, 3, 5, 6, 1, 3, 4, 8, 2094283, 123]
    >>> [_ for _ in chunker(aaa, 3)]
    [[1, 2, 3], [5, 6, 1], [3, 4, 8], [2094283, 123]]
    """
    for pos in range(0, len(seq), size):
        yield seq[pos:pos + size]

        
if __name__ == "__main__":
    import doctest
    doctest.testmod()