What is the most "pythonic" way to iterate over a list in chunks? What is the most "pythonic" way to iterate over a list in chunks? python python

What is the most "pythonic" way to iterate over a list in chunks?


def chunker(seq, size):    return (seq[pos:pos + size] for pos in range(0, len(seq), size))# (in python 2 use xrange() instead of range() to avoid allocating a list)

Works with any sequence:

text = "I am a very, very helpful text"for group in chunker(text, 7):   print(repr(group),)# 'I am a ' 'very, v' 'ery hel' 'pful te' 'xt'print '|'.join(chunker(text, 10))# I am a ver|y, very he|lpful textanimals = ['cat', 'dog', 'rabbit', 'duck', 'bird', 'cow', 'gnu', 'fish']for group in chunker(animals, 3):    print(group)# ['cat', 'dog', 'rabbit']# ['duck', 'bird', 'cow']# ['gnu', 'fish']


Modified from the Recipes section of Python's itertools docs:

from itertools import zip_longestdef grouper(iterable, n, fillvalue=None):    args = [iter(iterable)] * n    return zip_longest(*args, fillvalue=fillvalue)

Example

grouper('ABCDEFG', 3, 'x')  # --> 'ABC' 'DEF' 'Gxx'

Note: on Python 2 use izip_longest instead of zip_longest.


chunk_size = 4for i in range(0, len(ints), chunk_size):    chunk = ints[i:i+chunk_size]    # process chunk of size <= chunk_size


matomo