def get_complement_prop(numerator: float, denominator: float):
    """
    Get the complement of a fraction.

    Args:
        numerator: Numerator for calculation
        denominator: Denominator for calculation

    """

    # assert numerator <= denominator
    # assert 0.0 <= numerator
    # assert 0.0 <= denominator
    return 1.0 - numerator / denominator