Circular array shift

shift.py

def reverse_array(array: list, start, stop):
    tmp = array[start:stop]
    array[start:stop] = reversed(tmp)
    return array

def circular_array_shift(array: list, shift: int):
    if array and shift:
        length = len(array)
        shift %= length
        array = reverse_array(array, 0, length)
        array = reverse_array(array, 0, shift)
        array = reverse_array(array, shift, length)
        return array