import numpy as np
arr1 = np.array([[1,2,3],[4,5,6]])
arr1
array([[1, 2, 3], [4, 5, 6]])
arr2 = np.array([[1,1,1],[0,0,0]])
arr2
array([[1, 1, 1], [0, 0, 0]])
np.sum(arr2,axis=0)
array([1, 1, 1])
np.sum(arr2,axis=1)
array([3, 0])
np.sum(arr2)
3
arr2.sum()
3