Python-按元素添加2个列表?
我现在有了:
list1 = [1, 2, 3]list2 = [4, 5, 6]
我希望有:
[1, 2, 3] + + +
[4, 5, 6]
|| || ||
[5, 7, 9]
只是两个列表的元素加法。
我当然可以迭代两个列表,但是我不想这样做。
什么是最Python的方式这样做的?
回答:
使用map有operator.add
:
>>> from operator import add>>> list( map(add, list1, list2) )
[5, 7, 9]
或zip具有列表理解:
>>> [sum(x) for x in zip(list1, list2)][5, 7, 9]
时序比较:
>>> list2 = [4, 5, 6]*10**5>>> list1 = [1, 2, 3]*10**5
>>> %timeit from operator import add;map(add, list1, list2)
10 loops, best of 3: 44.6 ms per loop
>>> %timeit from itertools import izip; [a + b for a, b in izip(list1, list2)]
10 loops, best of 3: 71 ms per loop
>>> %timeit [a + b for a, b in zip(list1, list2)]
10 loops, best of 3: 112 ms per loop
>>> %timeit from itertools import izip;[sum(x) for x in izip(list1, list2)]
1 loops, best of 3: 139 ms per loop
>>> %timeit [sum(x) for x in zip(list1, list2)]
1 loops, best of 3: 177 ms per loop
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