元素-添加2个列表？

Question

元素-添加2个列表？我现在有：list1 = [1, 2, 3]list2 = [4, 5, 6]我希望：[1, 2, 3] +  +  +[4, 5, 6]|| || ||[5, 7, 9]简单地按元素添加两个列表。我当然可以迭代这两个列表，但我不想这样做。是什么最毕达通的方式这么做？

Answer 1

使用map带着operator.add:

>>> from operator import add

>>> list( map(add, list1, list2) )

[5, 7, 9]

或zip对清单的理解：

>>> [sum(x) for x in zip(list1, list2)]

[5, 7, 9]

时间比较：

>>> 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

Answer 2

[a + b for a, b in zip(list1, list2)]