import humansize


def approximate_size(size):
    """Returns the size of a file in a human-readable format where kilobytes are 1000 bytes

    :param size: the size of a file
    :return: string
    """
    return humansize.approximate_size(size, False)


if __name__ == '__main__':  # pragma: no cover
    print(approximate_size(1_000))
    print(approximate_size(100_000_000))
    print(approximate_size(1_000_000_000))