Iterate over a python sequence in multiples of n?

Question

How do I process the elements of a sequence in batches, idiomatically?

For example, with the sequence \"abcdef\" and a batch size of 2, I would like to do something

Answer 1

How about itertools?

from itertools import islice, groupby

def chunks_islice(seq, size):
    while True:
        aux = list(islice(seq, 0, size))
        if not aux: break
        yield "".join(aux)

def chunks_groupby(seq, size):
    for k, chunk in groupby(enumerate(seq), lambda x: x[0] / size):
        yield "".join([i[1] for i in chunk])