modin-project/modin

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Modin: Scale your Pandas workflows by changing a single line of code

Stars: 10.4k
Forks: 677
Open beginner issues: 0
Indexed issues: 676

Dominant language: Python
License: Apache-2.0
Last GitHub push: Feb 10, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: hacktoberfest
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

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676 open issues indexed

TEST: Unbounded fuzzydata version pin in dev requirements Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

modin-project/modin#7705 · Opened Aug 27, 2026
Future maintenance of modin Open

question ❓ Triage 🩹

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

modin-project/modin#7704 · 1 reaction · Opened Jul 14, 2026
BUG: `Resample.mean()` raises error on pandas 2.3.3 with native execution Open

bug 🦗 P3

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

modin-project/modin#7697 · Opened Apr 16, 2026
Suggestion: reference WFGY Problem Map (RAG / LLM debugging checklist) for Modin users Open

Difficulty 1/5 Under an hour Newbie friendliness 45/100

modin-project/modin#7696 · Opened Feb 21, 2026
BUG: `groupby().agg(<constant>)` lead to inconsistencies with Pandas Open

bug 🦗 Triage 🩹

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

modin-project/modin#7694 · Opened Dec 7, 2025
BUG: `groupby()` and `max()` lead to inconsistencies with Pandas Open

bug 🦗 Triage 🩹

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

modin-project/modin#7693 · Opened Dec 2, 2025
BUG: Expressions combining `.loc[]` and `.fillna()` causes inconsistencies with Pandas Open

bug 🦗 Triage 🩹

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

modin-project/modin#7692 · Opened Nov 26, 2025
Modin df becomes pandas df when sent to a ray remote. How can I stop it doing that? Open

question ❓ Triage 🩹

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

modin-project/modin#7691 · 1 comment · Opened Nov 25, 2025
BUG: Data types reading from csv file differ from those of Pandas Open

bug 🦗 Triage 🩹

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

modin-project/modin#7690 · Opened Nov 25, 2025
BUG: series with tuple name has a column multiindex in internal pandas frame Open

bug 🦗

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

modin-project/modin#7689 · Opened Oct 2, 2025
BUG: modin.pandas.eval() does not work at all Open

bug 🦗 P2

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

modin-project/modin#7656 · 2 comments · Opened Sep 2, 2025
PERF: Reduce excessive memory usage in Ray Open

P1 Performance 🚀

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

modin-project/modin#7655 · 1 reaction · Opened Aug 27, 2025
BUG: df.attrs fails with `AttributeError: can't set attribute` Open

bug 🦗 P2

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

modin-project/modin#7652 · 1 comment · Opened Aug 26, 2025
BUG: 'nrows' parameter do not seem to be honoured in read_excel() Open

bug 🦗 P2 pandas concordance 🐼

modin-project/modin#7651 · 1 assignee · Opened Aug 19, 2025
BUG: combine_first casts dtypes, pandas does not Open

bug 🦗 P2

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

modin-project/modin#7642 · 3 comments · Opened Aug 6, 2025
PandasOnRay doesn't implement reset_index for non-default `names` parameter Open

bug 🦗 hybrid-execution P1

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

modin-project/modin#7633 · Opened Jul 25, 2025
BUG: SeriesGroupBy.diff() raises TypeError for datetime64[ns] column with Pandas backend Open

bug 🦗

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

modin-project/modin#7631 · 2 comments · Opened Jul 24, 2025
FEAT: test mpi4py >= 4.1 on ubuntu by using appropriate mpich versions Open

dependencies 🔗 Testing 📈

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

modin-project/modin#7615 · Opened Jun 27, 2025
CI is broken due to MPI install issue Open

CI P0

modin-project/modin#7613 · 1 comment · 1 assignee · Opened Jun 26, 2025
df_equals still skips dtypes check for empty frames Open

Testing 📈

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

modin-project/modin#7600 · Opened Jun 4, 2025
BUG: QueryCompilerCaster breaks NamedTuple arguments Open

bug 🦗 hybrid-execution P1

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

modin-project/modin#7594 · Opened May 29, 2025
BUG: AttributeError: Can only use .cat accessor with a 'category' dtype Open

bug 🦗 Triage 🩹

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

modin-project/modin#7586 · Opened May 25, 2025
BUG: We do not respect semantics of to_numpy(copy=False) and np.array(copy=False) (the latter only available on numpy >= 2.1) Open

bug 🦗 P2

modin-project/modin#7583 · 1 assignee · Opened May 23, 2025
BUG: Conversion of Modin to Pandas causes "AttributeError: 'numpy.ndarray' object has no attribute 'categories'" Open

bug 🦗 Triage 🩹

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

modin-project/modin#7580 · 1 reaction · Opened May 23, 2025
BUG: `modin.pandas.concat` on dict of dataframes behaves different from default `pandas.concat` if the dict keys are tuples Open

bug 🦗 Triage 🩹

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

modin-project/modin#7568 · Opened May 14, 2025
BUG: automatic backend switching doesn't work well when extensions have different signatures than the original method Open

bug 🦗 hybrid-execution P2

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

modin-project/modin#7525 · Opened Apr 24, 2025
Support reader for apache iceberg Open

new feature/request 💬 Triage 🩹

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

modin-project/modin#7520 · Opened Apr 22, 2025
BUG: Creating empty unidist dataframes in benchmarkmode makes Modin get stuck Open

bug 🦗

Difficulty 3/5 1-2 days Newbie friendliness 52/100

modin-project/modin#7516 · Opened Apr 17, 2025
REFACTOR: Do not keep both dataframe and query compiler fields in _LocIndexer and _IlocIndexer Open

Code Quality 💯

modin-project/modin#7513 · 1 assignee · Opened Apr 16, 2025
BUG: .groupby('a').transform('size') returns dataframe, not series Open

bug 🦗 P3 pandas concordance 🐼

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

modin-project/modin#7508 · 1 comment · Opened Apr 11, 2025
FEAT: Support opportunistically switching backends pre- or post- some operations Open

modin-project/modin#7504 · 1 assignee · Opened Apr 11, 2025
BUG: query compiler costing functions should be parametrized by backend, not by query compiler class Open

bug 🦗 Code Quality 💯

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

modin-project/modin#7503 · 1 comment · Opened Apr 11, 2025
Stop skipping windows tests that depend on libxml once libxml2 2.14.1 is available on conda Open

CI P0 Testing 📈

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

modin-project/modin#7499 · 1 comment · Opened Apr 4, 2025
BUG: assigning series to certain rows of a dataframe with row or iloc incorrectly assigns NaN Open

bug 🦗 P1

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

modin-project/modin#7484 · Opened Mar 31, 2025
REFACTOR: Remove cyclic FactoryDispatcher imports from BasePandasDataset, DataFrame, modin.pandas.io, and Series definitions. Open

Code Quality 💯

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

modin-project/modin#7467 · Opened Mar 11, 2025
BUG: setting some config variables to invalid values makes them permanently unwriteable and unreadable Open

bug 🦗 P2

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

modin-project/modin#7454 · Opened Mar 6, 2025
MODIN creates new partition if we add new column to dataframe Open

question ❓

Difficulty 5/5 Over a week Newbie friendliness 28/100

modin-project/modin#7453 · 1 comment · 1 reaction · Opened Mar 4, 2025
BUG: engine_kwargs do not seem to be honoured in read_excel() Open

bug 🦗 P2 pandas concordance 🐼

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

modin-project/modin#7450 · Opened Feb 28, 2025
BUG: modin.pandas.concat wrangles types; differs from pandas.concat Open

bug 🦗 Triage 🩹

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

modin-project/modin#7447 · 3 comments · Opened Feb 26, 2025
Metrics interface for collecting modin frontend telemetry Open

new feature/request 💬 P2

modin-project/modin#7445 · 1 comment · 1 reaction · 1 assignee · Opened Feb 17, 2025
BUG: Should check individual storage format and engine instead of global ones Open

bug 🦗 P3

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

modin-project/modin#7429 · Opened Jan 27, 2025
BUG: DataFrame.__setitem__ on empty frame switches engines Open

bug 🦗

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

modin-project/modin#7428 · Opened Jan 27, 2025
Modin with Ray or Dask behaviour when cgroups linux thresholds are set Open

question ❓ Triage 🩹

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

modin-project/modin#7426 · Opened Jan 23, 2025
BUG: modin.pandas.read_csv: "FileNotFoundError: [Errno 2] No such file or directory" Open

bug 🦗 Triage 🩹

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

modin-project/modin#7416 · 1 comment · Opened Jan 7, 2025
BUG: `Series.clip` raises with pyarrow dtype backend Open

bug 🦗 Triage 🩹

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

modin-project/modin#7415 · Opened Jan 2, 2025
BUG: can't handle `df.groupby('a').agg(c=('b', 'mean'), d=('b', 'mean'))` Open

bug 🦗 Triage 🩹

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

modin-project/modin#7414 · Opened Dec 18, 2024
BUG: Pass Groupby kwargs to panads grouper Open

bug 🦗 Triage 🩹

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

modin-project/modin#7412 · Opened Dec 11, 2024
BUG: Modin with Ray not scaling across multiple CPUs Open

bug 🦗 Triage 🩹

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

modin-project/modin#7411 · 3 reactions · Opened Dec 6, 2024
BUG: can't use list of tuples of select multiple columns when columns are multiindex Open

bug 🦗 Triage 🩹

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

modin-project/modin#7409 · 1 comment · Opened Nov 13, 2024
BUG: jupyter loading of serialized modin objects from ray tasks converts to pandas objects Open

bug 🦗 Triage 🩹

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

modin-project/modin#7408 · 1 comment · Opened Nov 5, 2024

modin-project/modin

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