Python按元素逐个增加列表列表

Question

What is the neatest way to multiply element-wise a list of lists of numbers?

Eg

[[1,2,3],[2,3,4],[3,4,5]]

-> [6,24,60]

Answer 1

Use np.prod :

>>> a = np.array([[1,2,3],[2,3,4],[3,4,5]])
>>> np.prod(a,axis=1)
array([ 6, 24, 60])

Answer 2

Use a list comprehension and reduce :

>>> from operator import mul
>>> lis = [[1,2,3],[2,3,4],[3,4,5]]
>>> [reduce(mul, x) for x in lis]
[6, 24, 60]

Answer 3

import operator
import functools
answer = [functools.reduce(operator.mul, subl) for subl in L]

Or, if you prefer map:

answer = map(functools.partial(functools.reduce, operator.mul), L)  # listify as required