Naive in-place array rotation

rotate-array.py

def rotate_array(arr, k):
    element_at_secondary_index = None
    primary_index = 0
    steps = 0

    n = len(arr)

    while steps < n:
        secondary_index = (primary_index+k) % n

        if element_at_secondary_index is None:
            element_at_secondary_index, arr[secondary_index] = arr[secondary_index], arr[primary_index]
        else:
            temp = arr[secondary_index]
            arr[secondary_index], element_at_secondary_index = element_at_secondary_index, temp

        primary_index = secondary_index
        steps +=1
    
    return arr

# Test
print(rotate_array(arr=[1,2,3,4,5,6,7], k=3))