@sig((H/ "a" >> "a" >> Ordering)/ H >> ["a"] >> ["a"])
def sortBy(f, xs):
    """
    sortBy :: (a -> a -> Ordering) -> [a] -> [a]

    The sortBy function is the non-overloaded version of sort.
    """
    raise NotImplementedError()
dataset/ETHPy150Open billpmurphy/hask/hask/Data/List.py/sortBy/swapped operands of `/`