Python: split a list based on a condition?

Question

What\'s the best way, both aesthetically and from a performance perspective, to split a list of items into multiple lists based on a conditional? The equivalent of:

Answer 1

If you want to make it in FP style:

good, bad = [ sum(x, []) for x in zip(*(([y], []) if y in goodvals else ([], [y])
                                        for y in mylist)) ]

Not the most readable solution, but at least iterates through mylist only once.