Skip to content

perf: run fn once in loop #26

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
second-ed merged 1 commit into from
Mar 29, 2026
Merged

perf: run fn once in loop #26

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
17 changes: 11 additions & 6 deletions src/danom/_stream.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@
from collections.abc import Awaitable, Callable, Iterable, Sequence
from concurrent.futures import ProcessPoolExecutor, ThreadPoolExecutor
from copy import deepcopy
from enum import Enum, auto
from enum import Enum
from functools import reduce
from itertools import batched
from typing import ParamSpec, TypeVar, cast
Expand Down Expand Up @@ -312,10 +312,15 @@ def partition(
seq_tuple = self.par_collect(workers=workers, use_threads=use_threads)
else:
seq_tuple = self.collect()
return (
Stream(seq=tuple(x for x in seq_tuple if fn(x))),
Stream(seq=tuple(x for x in seq_tuple if not fn(x))),
)

pos, neg = [], []

for x in seq_tuple:
if fn(x):
pos.append(x)
else:
neg.append(x)
return (Stream.from_iterable(pos), Stream.from_iterable(neg))

def fold(
self, initial: T, fn: Callable[[T, U], T], *, workers: int = 1, use_threads: bool = False
Expand Down Expand Up @@ -442,7 +447,7 @@ async def async_collect(self) -> Awaitable[tuple[U, ...]]:


class _Nothing(Enum):
NOTHING = auto()
NOTHING = 0


PlannedOps = tuple[str, StreamFn]
Expand Down
Loading