How to get a matrix from arrays?

Question

Python

Hello! The problem is this.
I have 2 arrays as input. It is necessary to get the (i-1)-th element for each element i of the first array (and then the second one). That is, so that the element i-1 should be in place i, the element i should be in place i+1, i +1 should be in place i+2, and so on. And the same with the second array. And then push these two arrays into the np.matrix matrix (the first array on the first line, the second array on the second). How is it rational to do this and why doesn't it work like that?

list1 = []
 
    for i in range(len(array1)):
        a1         = array1[i-1]
        list1.append(a1)
    array1 = np.array(list1)
 
list2 = []
 
    for i in range(len(array2)):
        a2 = array2[i-1]
        list2.append(a2)
    array2 = np.array(list2)
 
    
total_array = np.vstack((array1, array2))

Answer 1

def shiftList(lst, n):
    n = n % len(lst)
    return lst[n:] + lst[:n]

a = [1, 2, 3, 4, 5, 6, 7]
shiftList(a,1)

Well, since you are using numpy, then

import numpy
a = [1, 2, 3, 4, 5, 6, 7]
numpy.roll(a,1)