我希望能够交错两个可能长度不等的列表.我有的是:
def interleave(xs,ys): a=xs b=ys c=a+b c[::2]=a c[1::2]=b return c
这适用于长度相等或只是/ -1的列表.但是如果让我们说xs = [1,2,3]和ys = [“hi,”bye“,”no“,”yes“,”why“]这条消息出现:
c[::2]=aValueError: attempt to assign sequence of size 3 to extended slice of size 4
如何使用索引修复此问题?或者我必须使用for循环?
编辑:我想要的是让额外的值出现在最后.
itertools.izip_longest
: >>> from itertools import izip_longest>>> xs = [1,3]>>> ys = ["hi","bye","no","yes","why"]>>> s = object()>>> [y for x in izip_longest(xs,ys,fillvalue=s) for y in x if y is not s][1,'hi','bye',3,'no','yes','why']
使用itertools的roundrobin配方,此处不需要哨兵值:
from itertools import *def roundrobin(*iterables): "roundrobin('ABC','D','EF') --> A D E B F C" # Recipe credited to George Sakkis pending = len(iterables) nexts = cycle(iter(it).next for it in iterables) while pending: try: for next in nexts: yIEld next() except stopiteration: pending -= 1 nexts = cycle(islice(nexts,pending))
演示:
>>> List(roundrobin(xs,ys))[1,'why']>>> List(roundrobin(ys,xs))['hi',1,'why']总结
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