从Python的itertools文档的食谱部分进行了修改：
from itertools import zip_longest
def grouper(iterable, n, fillvalue=None):
args = [iter(iterable)] * n
return zip_longest(*args, fillvalue=fillvalue)
示例 用伪代码保持示例简洁。
grouper('ABCDEFG', 3, 'x') --> 'ABC' 'DEF' 'Gxx'
注意：在Python 2上，请使用izip_longest代替zip_longest。
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)
适用于任何序列：
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 text
animals = ['cat', 'dog', 'rabbit', 'duck', 'bird', 'cow', 'gnu', 'fish']
for group in chunker(animals, 3):
print(group)
# ['cat', 'dog', 'rabbit']
# ['duck', 'bird', 'cow']
# ['gnu', 'fish']
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