If you use numpy, this is easy:
slice = arr[:2,:2]
or if you want the 0’s,
slice = arr[0:2,0:2]
You’ll get the same result.
*note that slice is actually the name of a builtin-type. Generally, I would advise giving your object a different “name”.
Another way, if you’re working with lists of lists*:
slice = [arr[i][0:2] for i in range(0,2)]
(Note that the 0’s here are unnecessary: [arr[i][:2] for i in range(2)] would also work.).
What I did here is that I take each desired row 1 at a time (arr[i]). I then slice the columns I want out of that row and add it to the list that I’m building.
If you naively try: arr[0:2] You get the first 2 rows which if you then slice again arr[0:2][0:2], you’re just slicing the first two rows over again.
*This actually works for numpy arrays too, but it will be slow compared to the “native” solution I posted above.