[英]How do I print/return the sum of all values in a matrix in Python?
我需要創建一個 function,它將矩陣作為參數,然后返回矩陣中所有值的總和。 因此,如果傳遞給 function 的矩陣 = [[12, 4], [9, 6], [5, 7]] 我希望 function 返回值 43
有兩種方法。
(1) 使用 numpy。
L = [[12, 4], [9, 6], [5, 7]]
np.array(L).sum()
(2) 使用迭代。
L = [[12, 4], [9, 6], [5, 7]]
sum([sum(l) for l in L])
Was = [[12, 4], [9, 6], [5, 7]]
>>> count = 0
>>> for i in was:
... for j in i:
... count += j
...
>>> count
43
使用map()
sum(map(sum,[[12, 4], [9, 6], [5, 7]]))
使用itertools.chain.from_iterable()
來展平列表,然后調用sum()
:
>>> from itertools import chain
>>> was = [[12, 4], [9, 6], [5, 7]]
>>> sum(chain.from_iterable(was))
43
也可以這樣展平:
>>> sum(number for sublst in was for number in sublst)
43
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