List splitting by predicate

Is there a more concise way to split a list into two lists by a predicate?

errors, okays = [], []
for r in results:
    if success_condition(r):
        okays.append(r)
    else:
        errors.append(r)

I understand that this can be turned into an ugly one-liner using reduce; this is not what I'm looking for.

Update: calculating success_condition only once per element is desirable.