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pydata

8 indexed repositories · View on GitHub

xarray
N-D labeled arrays and datasets in Python

Python · 4199 stars
pandas-datareader
Extract data from a wide range of Internet sources into a pandas DataFrame.

Python · 3269 stars
numexpr
Fast numerical array expression evaluator for Python, NumPy, Pandas, PyTables and more

Python · 2541 stars
bottleneck
Fast NumPy array functions written in C

Python · 1182 stars
patsy
Describing statistical models in Python using symbolic formulas

Python · 990 stars
pydata-sphinx-theme
A clean, three-column Sphinx theme with Bootstrap for the PyData community

Python · 778 stars
sparse
Sparse multi-dimensional arrays for the PyData ecosystem

Python · 668 stars
xarray-data
Data repository for xarray examples

Python · 43 stars

Beginner friendly Everything

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Heap corruption when a compiled NumExpr object is called from several threads with NUMEXPR_NUM_THREADS=1 Open

Difficulty 4/5 3-5 days Newbie friendliness 50/100

pydata/numexpr#569 · Opened Sep 19, 2026
Publish test results cannot create check-runs with permissions: {} (403) Open

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

pydata/xarray#11594 · Opened Sep 18, 2026
xarray - dask `map_blocks` duplicates coordinate tasks across calls on the same object Open

bug needs triage

Difficulty 3/5 1-2 days Newbie friendliness 78/100

pydata/xarray#11588 · 2 comments · Opened Sep 14, 2026
GH Action ts-graphviz/setup-graphviz not maintained anymore, might want to stop depending on it Open

good first issue kind: maintenance tag: CI

Difficulty 3/5 1-2 days Newbie friendliness 55/100

pydata/pydata-sphinx-theme#2493 · 1 comment · Opened Sep 14, 2026
BUG: test_memory_leak is flaky Open

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

pydata/bottleneck#597 · Opened Sep 13, 2026
Fix accessors docs build Open

bug needs triage

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

pydata/xarray#11584 · Opened Sep 12, 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
`CachingFileManager` opens one file handle per `open_dataset()` call — could identical managers share a `FILE_CACHE` entry? Open

needs triage

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

pydata/xarray#11581 · 1 comment · Opened Sep 11, 2026
Dark mode like it’s 2024 Open

good first issue tag: CSS

Difficulty 4/5 3-5 days Newbie friendliness 68/100

pydata/pydata-sphinx-theme#2484 · 2 comments · Opened Sep 7, 2026
Weighted reductions drop orphaned dimensions Open

bug needs triage

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

pydata/xarray#11560 · 4 comments · Opened Sep 4, 2026
`max`, `min` and datetime `mean`/`median` raise on an empty dimension Open

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

pydata/xarray#11554 · 1 comment · Opened Sep 1, 2026
quantile fails on an empty dimension where other reductions return NaN Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

pydata/xarray#11549 · 2 comments · Opened Aug 29, 2026
Path to 0.22.0 Open

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

pydata/pydata-sphinx-theme#2475 · 1 comment · Opened Aug 25, 2026
Dask graph rewriting/ expression optimisation Open

enhancement

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

pydata/xarray#11542 · 4 comments · Opened Aug 24, 2026
`get_chunked_array_type` rejects two array classes handled by the same chunk manager Open

bug needs triage

Difficulty 3/5 1-2 days Newbie friendliness 75/100

pydata/xarray#11539 · 1 comment · Opened Aug 21, 2026
Benchmark compare last release: asv silently runs zero benchmarks since #10866 (py-rattler was added to environment-benchmark.yml but not environment.yml) Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

pydata/xarray#11533 · 1 comment · Opened Aug 19, 2026
JSON format coordination with mike Open

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

pydata/pydata-sphinx-theme#2470 · 1 comment · 2 reactions · Opened Aug 17, 2026
xarray change subset of values of Dataset variable obtained from pandas DataFrame with pandas v3 Open

needs triage

Difficulty 3/5 1-2 days Newbie friendliness 50/100

pydata/xarray#11527 · Opened Aug 15, 2026
Sidebar/Navbar in not working without JavaScript Open

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

pydata/pydata-sphinx-theme#2466 · Opened Aug 15, 2026
documentation switcher.json check Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

pydata/pydata-sphinx-theme#2465 · 1 reaction · Opened Aug 13, 2026
array API: missing `arange` Open

pydata/sparse#950 · 5 comments · 1 assignee · Opened Aug 12, 2026
DataTree constructor error message says dict even though dict is not accepted Open

bug needs triage

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

pydata/xarray#11514 · Opened Aug 12, 2026
In open_zarr, decode_timedelta does not behave as documented Open

bug topic-zarr

Difficulty 3/5 1-2 days Newbie friendliness 62/100

pydata/xarray#11507 · 7 comments · Opened Aug 11, 2026
Intermittent silently-incorrect results from Series/DataFrame boolean comparison on large arrays (100% reproducible, fixed by compute.use_numexpr=False) Open

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

pydata/numexpr#566 · 4 comments · Opened Aug 6, 2026
⚠️ Nightly upstream-dev CI failed ⚠️ Open

CI

Difficulty 4/5 3-5 days Newbie friendliness 38/100

pydata/xarray#11501 · 1 comment · Opened Aug 4, 2026
Construction of arrays with `object` dtype very slow when Pandas `future.infer_string` is enabled Open

bug topic-performance

Difficulty 3/5 1-2 days Newbie friendliness 55/100

pydata/xarray#11470 · 5 comments · Opened Jul 23, 2026
Mobile primary-sidebar toggle silently does nothing with some themes Open

impact: high kind: bug

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

pydata/pydata-sphinx-theme#2451 · 2 comments · Opened Jul 22, 2026
Add 'Hide Text' option for right-hand "On this page" (TOC) sidebar Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

pydata/pydata-sphinx-theme#2450 · 1 comment · Opened Jul 21, 2026
StringDType does not roundtrip through zarr Open

bug needs triage

Difficulty 3/5 1-2 days Newbie friendliness 56/100

pydata/xarray#11466 · 1 comment · 1 reaction · Opened Jul 21, 2026
Testing secting is user guide renders incorrectly Open

bug topic-documentation

Difficulty 3/5 1-2 days Newbie friendliness 42/100

pydata/xarray#11465 · 9 comments · Opened Jul 21, 2026
Unable to roundtrip sharded zarr Open

bug needs triage

Difficulty 4/5 3-5 days Newbie friendliness 52/100

pydata/xarray#11460 · Opened Jul 20, 2026
Documentation build failing in Windows Open

bug topic-documentation

Difficulty 3/5 1-2 days Newbie friendliness 58/100

pydata/xarray#11458 · 10 comments · Opened Jul 19, 2026
unstack is slow for regular data Open

bug topic-performance

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

pydata/xarray#11455 · 4 comments · Opened Jul 17, 2026
DataTree.children repr is inconsistent with DataTree.parent (rich HTML vs. flat nested text) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

pydata/xarray#11453 · 2 comments · Opened Jul 14, 2026
REPR: Allow accessor to be included in the repr Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 45/100

pydata/xarray#11451 · 1 comment · 1 reaction · Opened Jul 14, 2026
Dismissing an announcement should be tied to the announcement text rather than a time period Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

pydata/pydata-sphinx-theme#2441 · 1 reaction · Opened Jul 9, 2026
exception to indexed-coordinate only inheritance for `coordinates` encoding Open

enhancement

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

pydata/xarray#11441 · 1 comment · 1 reaction · Opened Jul 7, 2026
resolving the nightly version of `numcodecs` fails Open

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

pydata/xarray#11437 · 1 comment · Opened Jul 5, 2026
a proposal to simplify encoding for zarr data Open

topic-zarr

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

pydata/xarray#11431 · 8 comments · 1 reaction · Opened Jul 2, 2026
Allow data variables paths instead of just names in xarray.concat when passing DataTrees Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 62/100

pydata/xarray#11427 · 1 comment · Opened Jun 30, 2026
np.linalg.pinv of a DataArray results in mismatched coordinates Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

pydata/xarray#11396 · 3 comments · Opened Jun 22, 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
Lighthouse audit workflow is flaky Open

needs: investigation tag: CI

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

pydata/pydata-sphinx-theme#2408 · Opened Jun 8, 2026
head's up about private zarr-python API usage Open

topic-zarr

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

pydata/xarray#11378 · Opened Jun 7, 2026
Documentation error for DataArray.pad Open

bug needs triage

Difficulty 1/5 1-3 hours Newbie friendliness 82/100

pydata/xarray#11373 · 2 comments · Opened Jun 4, 2026
upstream type checking with a nightly version of `numpy` Open

CI topic-typing

Difficulty 4/5 3-5 days Newbie friendliness 38/100

pydata/xarray#11371 · 1 comment · Opened Jun 3, 2026
Cannot reindex onto a stacked MultiIndex via indexers — only reindex_like works Open

Difficulty 4/5 3-5 days Newbie friendliness 58/100

pydata/xarray#11368 · Opened Jun 1, 2026
Load and build indices lazily Open

enhancement topic-indexing

Difficulty 5/5 Over a week Newbie friendliness 38/100

pydata/xarray#11367 · 5 comments · Opened Jun 1, 2026
VarLookupDict should implement __iter__, causes CPython crash when using statsmodels in marimo notebook Open

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

pydata/patsy#259 · Opened May 30, 2026
add `use_zarr_fill_value_as_mask` in `open_datatree` for Zarr Stores Open

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

pydata/xarray#11361 · Opened May 27, 2026

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