pydata/bottleneck

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Fast NumPy array functions written in C

Stars: 1.2k
Forks: 115
Open beginner issues: 0
Indexed issues: 50
Avg merge: 1d 9h
Merged PRs (30d): 11

Dominant language: Python
License: BSD-2-Clause
Last GitHub push: Sep 15, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
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50 open issues indexed

BUG: test_memory_leak is flaky Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

pydata/bottleneck#597 · Opened Sep 13, 2026
REL: new release needed Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

pydata/bottleneck#591 · 3 comments · Opened Sep 12, 2026
BUG: test flakiness observed in free-threaded Python Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

pydata/bottleneck#574 · 1 comment · Opened Jun 8, 2026
Py_MOD_GIL_NOT_USED declared but global state unprotected for free-threading Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

pydata/bottleneck#532 · Opened Mar 29, 2026
error_converting + TYPE_ERR clobbers original exception (~15 sites) Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

pydata/bottleneck#531 · Opened Mar 29, 2026
Module object leaked on import_array/intern_strings failure in all PyInit functions Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

pydata/bottleneck#530 · Opened Mar 29, 2026
BUFFER_NEW macro: unchecked malloc inside GIL-released region Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

pydata/bottleneck#529 · Opened Mar 29, 2026
PyArray_Ravel unchecked in iterators.h init_iter_all — NULL dereference and ref leak Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

pydata/bottleneck#528 · Opened Mar 29, 2026
mm_new/mm_new_nan: three unchecked malloc calls — segfault on OOM Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

pydata/bottleneck#526 · Opened Mar 29, 2026
move_median MEMORY_ERR without return — segfault under OOM Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

pydata/bottleneck#519 · 6 comments · Opened Mar 29, 2026
Umbrella issue: bottleneck C Extension Analysis Report Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

pydata/bottleneck#518 · 8 comments · Opened Mar 29, 2026
Where is bottleneck.move_quantile? Open

bug

Difficulty 5/5 Over a week Newbie friendliness 20/100

pydata/bottleneck#517 · 1 comment · Opened Mar 27, 2026
BLD: adopting the meson build backend Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

pydata/bottleneck#516 · 8 comments · Opened Mar 26, 2026
[BUG] move_sum returns a negative value for a sum over a pandas Series with all non-negative values Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/bottleneck#480 · Opened Jul 20, 2025
[SUGGESTION] adding types stubs Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/bottleneck#479 · 1 comment · Opened Jun 5, 2025
[BUG]move_rank is much slower than pd.rolling(window).rank() when window is a large value(>1000) Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/bottleneck#466 · Opened Dec 4, 2024
Catastrohpic accuracy loss in large float32 array for nanmean and nanstd Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pydata/bottleneck#462 · 2 comments · Opened Oct 15, 2024
Implicit fallthroughs prevent compiler warning enablement Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pydata/bottleneck#455 · 1 comment · Opened Jun 26, 2024
ADD a 'move_apply' function Open

bug

Difficulty 5/5 Over a week Newbie friendliness 35/100

pydata/bottleneck#452 · Opened Jun 10, 2024
2D window implementation Open

bug

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/bottleneck#448 · Opened May 4, 2024
Seeking advice on implementing certain operators on GPU Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/bottleneck#446 · Opened Apr 17, 2024
[BUG] bottleneck gives erroneous standard deviation in Pandas with float32 array. Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

pydata/bottleneck#443 · 4 comments · Opened Feb 20, 2024
[ENHANCEMENT] move_rank is twice as slow as pandas.rolling.rank Open

bug

Difficulty 5/5 Over a week Newbie friendliness 20/100

pydata/bottleneck#438 · Opened Dec 13, 2023
use move_mean and set window&min_count =1, diff result Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pydata/bottleneck#437 · 1 reaction · Opened Sep 6, 2023
Ignore length check Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/bottleneck#434 · 1 comment · Opened Jul 12, 2023
Can you add 'nanquantile' to this project? Open

bug

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/bottleneck#433 · 2 comments · 2 reactions · Opened Jun 20, 2023
👋 Additional maintainers wanted! Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

pydata/bottleneck#424 · 10 comments · Opened Jan 16, 2023
[Enhancement] Add move_skew and move_kurt Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/bottleneck#415 · 2 comments · Opened Jul 11, 2022
Python crashed in fuzzing test of 7 APIs Open

bug

pydata/bottleneck#409 · 1 comment · 1 assignee · Opened May 15, 2022
[Enhancement] Weighted Median function Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/bottleneck#408 · 1 comment · Opened Apr 1, 2022
Where is move_nanstd? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/bottleneck#390 · 1 comment · Opened Oct 14, 2021
[BUG] Four potential memory leaks due to refcnt not decreased on error branches. (Static analysis reports) Open

bug

pydata/bottleneck#383 · 1 assignee · Opened Jun 29, 2021
[BUG] Numerical inaccuracy in summation based routines Open

bug

pydata/bottleneck#379 · 5 comments · 1 reaction · 1 assignee · Opened Apr 8, 2021
[BUG] get wrong result in move_mean Open

bug

pydata/bottleneck#377 · 2 comments · 1 assignee · Opened Mar 19, 2021
[Enhancement] Add functions that extend anynan for non-finite values Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/bottleneck#374 · 1 comment · 1 reaction · Opened Jan 30, 2021
nonreduce_axis.push to support more dtypes Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pydata/bottleneck#349 · 1 comment · Opened Jul 9, 2020
np.nansum is not slow than bn.nansum when use float32 Open

bug perf

Difficulty 3/5 1-2 days Newbie friendliness 38/100

pydata/bottleneck#342 · 1 comment · Opened Apr 4, 2020
[QUESTION] Plans for an equivalent to pandas groupby? Open

enhancement

pydata/bottleneck#341 · 4 comments · 1 assignee · Opened Apr 1, 2020
[BUG] move_mean gives negative values for array with no negative values in it Open

bug

pydata/bottleneck#332 · 1 comment · 4 reactions · 1 assignee · Opened Mar 10, 2020
Enhancement Request: Numba Integration Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/bottleneck#331 · 2 comments · 2 reactions · Opened Mar 10, 2020
NaN-aware sum-of-squares (nanss) Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pydata/bottleneck#330 · 1 comment · Opened Mar 9, 2020
Let nanarg{min,max}(..., axis=...) optionally return a placeholder value for all-nan slices. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/bottleneck#198 · 1 comment · Opened Nov 8, 2018
Implement fast version of nanpercentile Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

pydata/bottleneck#196 · 2 reactions · Opened Sep 13, 2018
Inconsistencies in nansum for float32 dtype compared to numpy Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/bottleneck#193 · 6 comments · Opened Aug 15, 2018
Improved slow sum-of-squares Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/bottleneck#189 · 6 comments · Opened Apr 5, 2018
Support tuple axis keyword argument Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/bottleneck#188 · 1 comment · 2 reactions · Opened Apr 4, 2018
[enhancement] perhaps add nanptp Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

pydata/bottleneck#187 · 1 comment · Opened Mar 27, 2018
Possible to implement a Centered moving average? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/bottleneck#186 · 9 comments · Opened Mar 15, 2018
reducing to scalar upcasts np.float32 to float Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pydata/bottleneck#185 · 3 comments · Opened Mar 15, 2018
Unexpected behavior for bn.move_std with float32 array Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pydata/bottleneck#164 · 19 comments · Opened Feb 28, 2017

pydata/bottleneck

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