python中怎么求和
python自带的sum函数(或者Numpy中的sum函数),
无参时,所有全加;
axis=0,按列相加;
axis=1,按行相加
import numpy as np#python中自带的sum
print(sum([[1,2,3],[4,5,5]]))
print(sum([[1,2,3],[4,5,5]],axis=0))
print(sum([[1,2,3],[4,5,5]],axis=1))
#Numpy中的sum
a = np.sum([[1,2,3], [4,5,5]]) #无参
print(a)
print(a.shape)
a = np.sum([[1,2,3], [4,5,5]],axis=0) #axis=0, 按列相加
print(a)
print(a.shape)
a = np.sum([[1,2,3], [4,5,5]],axis=1) #axis=1, 按行相加
print(a)
print(a.shape)
输出结果
20[5 7 8]
[ 6 14]
20
()
[5 7 8]
(3,)
[ 6 14]
(2,)
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