def get_unique_objects_in_order(iterable):
    """
    Get unique objects in the order of their appearance in iterable.
    Arguments:
        iterable (iterable): objects
    Returns:
        list: (n_unique_objects); unique objects ordered by their appearances
            in iterable
    """

    unique_objects_in_order = []

    for o in iterable:

        if o not in unique_objects_in_order:
            unique_objects_in_order.append(o)

    return unique_objects_in_order