def take_away_from(y):
    """take_away_from(y)(x) = y - x

    Be careful with this because subtraction is not commutative.
    The flipped version of this is 'take_away'

    >>> list(map(take_away_from(2), [1,2,3,4,5]))
    [1, 0, -1, -2, -3]
    """
    return lambda x : y - x