How to Slice Multi Dimensional Array?

Question

Dipping my toes into multi dimensional array slicing in Python and am hitting a wall of confusion with the following code

# Example 2D array
matrix = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
]
# Basic slicing
result = matrix[0:2][1:2]
print(result)

So when I read this example with the following line: result = matrix[0:2][1:2]

I read this as result = matrix [rows][columns]

So to me I would think that this should return the first two rows of the matrix, and then the specified columns as per the slice [1:2]

So I would imagine it should return first the rows first -> [1, 2, 3], [4, 5, 6]

Then after this it should take another slice with [1:2] so I would guess it should return [5]? Row 1 and up to the 2nd element?

When I run the code the following is the result

[[4,5,6]]

I am totally wrong so was wondering what am I missing?

I tried to google this kind of syntax where it has matrix[X:X][X:X] but I was not able to find out what is this called so if anyone can shed some light or point me in the right direction I would greatly appreciate it!

Answer 1

When get matrix[0:2] you receive 2 first elements of basic matrix with index 0 and 1: [1, 2, 3], [4, 5, 6]. Then you try slice[1:2] in getted before result you receive only 1 element with index 1 which equal [4, 5, 6]