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

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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([], islice(it, chunksize - 1)))
if __name__ == '__main__':
lst = ['a', 'b', 'c', 'd', 'e', 'f']
for i in chunk(lst, 2, list):
print i
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