Question

我有两个列表，比如

num = [1,2,3,4]
names = ['shiva','naga','sharath','krishna','pavan','adi','mulagala']

我想并行打印两个列表，如果一个列表（num）结束，我想重复第一个列表（num）直到第二个（名称）列表结束。

现在我希望输出为

1 for shiva
2 for naga
3 for sarath
4 for krishna
1 for pavan
2 for adi
3 for mulagala

Answer 1

使用itertools.cycle和zip：

>>> num = [1,2,3,4]
>>> names = ['shiva','naga','sharath','krishna','pavan','adi','mulagala']
>>> import itertools
>>> for i, name in zip(itertools.cycle(num), names):
...     print('{} for {}'.format(i, name))
...
1 for shiva
2 for naga
3 for sharath
4 for krishna
1 for pavan
2 for adi
3 for mulagala

Answer 2

您需要使用itertools.cycle和itertools.izip的组合。例如：

>>> num = [1,2,3,4]
>>> names = ['shiva','naga','sharath','krishna','pavan','adi','mulagala']
>>> import itertools
>>> list(itertools.izip(itertools.cycle(num), names))
[(1, 'shiva'), (2, 'naga'), (3, 'sharath'), (4, 'krishna'), (1, 'pavan'), (2, 'adi'), (3, 'mulagala')]

Answer 3

列表（roundrobin（＆＃39; ABC＆＃39;，＆＃39; D＆＃39;，＆＃39; EF＆＃39;））

输出： [＆＃39; A＆＃39;，＆＃39; D＆＃39;，＆＃39; E＆＃39;，＆＃39; B＆＃39;，＆＃39; F＆＃39;，＆＃39; C＆＃39;]

from itertools import chain, izip_longest
def roundrobin(*iterables):
    sentinel = object()
    return (x for x in chain(*izip_longest(fillvalue=sentinel, *iterables)) if x is not sentinel)

如何使用两个列表作为循环python

3 个答案: