oops, you're right, I have ended up with an unnecessary "not" in there, should
be:
from collections import deque
def partition(pred, iterable):
results = deque([]), deque([])
def gen_split(only):
for thing in iterable:
if results[only]:
yield results[only].popleft()
results[pred(thing)].append(thing)
for thing in results[only]:
yield thing
return gen_split(True), gen_split(False)
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