import numpy as np
x = range(1,16)
print(x)
x = np.array(x)
print(x)
print(x.sum())
# 3行5列
x = x.reshape(3,5)
# 120
print(x)
# 120
print(x.sum())
# 120
print(np.sum(x))
# 沿着 第0轴 x轴 列求和
print(np.sum(x,axis=0))
# 沿着 第1轴 y轴 行求和
print(np.sum(x,axis=1))


print(np.cumsum(x,axis=0))
print(np.cumsum(x,axis=1))



range(1, 16)
[ 1  2  3  4  5  6  7  8  9 10 11 12 13 14 15]
120
[[ 1  2  3  4  5]
 [ 6  7  8  9 10]
 [11 12 13 14 15]]
120
120
[18 21 24 27 30]

[15 40 65]


[[ 1  2  3  4  5]
 [ 7  9 11 13 15]
 [18 21 24 27 30]]


[[ 1  3  6 10 15]
 [ 6 13 21 30 40]
 [11 23 36 50 65]]