《NumPy快速入门》07 - 轴参数

sum

a = np.array([[1, 2, 3], [4, 5, 6]])
a.sum()
a.sum(axis=0)
a.sum(axis=1)

min/max/argmin/mean

a.max()
a.min(axis=1)
a.mean(axis=1)
a.argmin(axis=0) #索引

any/all

np.any(a > 2, axis = 0)

np.any(a > 2, axis = 0)
np.all(a > 2, axis = 1)