Op 6/06/2022 om 18:07 schreef Mathew Elman:
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)
There still is something wrong. I get the second list twice:
odd, even = partition(lambda i: i % 2, range(20))
print(list(odd))
[1, 3, 5, 7, 9, 11, 13, 15, 17, 19]
print(list(even))
[0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 0, 2, 4, 6, 8, 10, 12, 14, 16, 18]
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