move_negatives_to_front

arr = [-12, 11, -13, -5, 6, -7, 5, -3, -6]
for i in range(len(arr)):
    key = arr[i]
    if (key  > 0):
        continue
    j = i - 1
    while (j >= 0 and arr[j] > 0):
        arr[j + 1] = arr[j]
        j = j - 1
    arr[j + 1] = key
arr