Function to iterate over an iterable chunk by chunk, choosing the number of item of each chunks and the type of the chunk

chunk_iterable.py

from itertools import chain, islice

def chunk(seq, chunksize, process=iter):
    """ Yields items from an iterator in iterable chunks."""
    it = iter(seq)
    while True:
        yield process(chain([it.next()], islice(it, chunksize - 1)))

if __name__ == '__main__':  
    lst = ['a', 'b', 'c', 'd', 'e', 'f']  
    for i in chunk(lst, 2, list):
        print i