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

if __name__ == '__main__':  
    lst = ['a', 'b', 'c', 'd', 'e']  
    for i in chunk(lst, 3):
        print i