python numpy roll with padding

Question

I\'d like to roll a 2D numpy in python, except that I\'d like pad the ends with zeros rather than roll the data as if its periodic.

Specifically, the following code<

Answer 1

Elaborating on the answer by Hooked (since it took me a few minutes to understand it)

The code below first pads a certain amount of zeros in the up, down, left and right margins and then selects the original matrix inside the padded one. A perfectly useless code, but good for understanding np.pad.

import numpy as np
x = np.array([[1, 2, 3],[4, 5, 6]])
y = np.pad(x,((1,3),(2,4)), mode='constant')[1:-3,2:-4]

print np.all(x==y)

now to make an upwards shift of 2 combined with a rightwards shift of 1 position one should do

print np.pad(x,((0,2),(1,0)), mode='constant')[2:0,0:-1]