def sum_squares(nested_list):
    """
    Write a function that sums squares of numbers in list.

    That list may contain additional lists.
    (Hint use the type() or isinstance() function)

    sum_squares([1, 2, 3]) -> 14
    sum_squares([[1, 2], 3]) -> sum_squares([1, 2]) + 9 -> 1 + 4 + 9 -> 14
    sum_squares([[[[[[[[[2]]]]]]]]]) -> 4

    :param nested_list: list of lists of lists of lists of lists ... and ints
    :return: sum of squares
    """
    assert nested_list >= 0
    if nested_list == 0:
        return 0
    else:
        return sum_squares(nested_list - 1) + nested_list * nested_list


if __name__ == "__main__":
    print(sum_squares([1, 2, 3]))  # -> 14
    print(sum_squares([[1, 2], 3]))  # -> 14
    print(sum_squares([[[[[[[[[2]]]]]]]]]))  # -> 4