>>> b=np.sum(x)
print(b)
21
#create 2D array Matrix 4X4
Matrix = [[0 for i in range(4)] for j in range(4)]
#2D array python
x=[[11, 12,13],[14, 15,16],[17, 18,19]]
sum(sum(x,[]))
>>> x=[[1, 2],[3, 4],[5, 6]]
>>> sum(sum(x,[]))
21