Point (x,y) coordinates sort lower to higher in Python

Random points in "points" list. Like this : [x,y] = ([3,4],[2,5],[0,7],[8,1]) .

But i need to do these process ;

• First one , i have to sort points in list like lower Y and lower X as a point double.(For example [1,2],[1,3]) .

• Second one, how can i do action in list like this ; (Y0-Y1 / X0-X1) .

Here is my codes ;

import numpy as np
points = np.random.randint(0, 9, size=(18,2))
print(points)