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pandas-dev

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pandas
Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects,...

Python · 49759 stars
pandas-stubs
Public type stubs for pandas

Python · 327 stars
pandas-governance
Project governance documents for the pandas Project

36 stars
asv-runner
https://pandas-dev.github.io/asv-runner/

Python · 3 stars

Beginner friendly Everything

Open All

Renaming of Groupby classes to GroupBy Open

Groupby

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

pandas-dev/pandas-stubs#1948 · 1 comment · 1 reaction · Opened Sep 19, 2026
BUG: rolling().skew()/.kurt() return NaN once an earlier window's nobs hits 0 Open

Bug Regression Window

pandas-dev/pandas#69037 · 3 comments · 1 assignee · Opened Sep 19, 2026
Commit 09d1b59685fb44e88617037e921296cfa473b649 Open

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

pandas-dev/asv-runner#167 · 4 comments · Opened Sep 19, 2026
BUG: test assert methods failing on object dtype column with lists of different nesting Open

Bug Testing

pandas-dev/pandas#69014 · 1 comment · 1 assignee · Opened Sep 18, 2026
BUG: Value-dependent formatting when casting from datetime to string Open

Astype Bug Datetime Dtype Conversions Needs Discussion

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

pandas-dev/pandas#69011 · 3 comments · Opened Sep 18, 2026
BUG/DEPR: low_memory keyword in read_csv Open

API Design Deprecate IO CSV Needs Discussion

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

pandas-dev/pandas#68706 · 3 comments · Opened Sep 14, 2026
DEPR: cache_dates in read_csv Open

Deprecate IO CSV

pandas-dev/pandas#68705 · 5 comments · 2 reactions · 1 assignee · Opened Sep 14, 2026
API: select_dtypes Open

API Design Needs Discussion

Difficulty 5/5 Over a week Newbie friendliness 42/100

pandas-dev/pandas#68703 · 3 comments · Opened Sep 14, 2026
BUG: parallel read_csv with sqlite converters Open

Bug IO CSV

pandas-dev/pandas#68505 · 3 comments · 1 assignee · Opened Sep 12, 2026
ERR: assert_numpy_array_equal gives confusing assertion message for NaT with different unit Open

Error Reporting Testing

pandas-dev/pandas#68459 · 2 comments · 1 assignee · Opened Sep 11, 2026
DOC/RLS: improve the 3.1.0 whatsnew notes Open

Docs Needs Discussion

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

pandas-dev/pandas#68437 · 6 comments · Opened Sep 11, 2026
ENH: move the postgresql extra from psycopg2 to psycopg 3 Open

Enhancement Needs Discussion

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

pandas-dev/pandas#68433 · 2 comments · Opened Sep 11, 2026
BUG/DEPR: conversion to pyarrow triggers .values deprecation warning Open

Arrow Compat Deprecate

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

pandas-dev/pandas#68426 · 1 comment · Opened Sep 11, 2026
Broken image in pandas 1.0 community blog post Open

pandas-dev/pandas#68425 · 2 comments · 1 assignee · Opened Sep 11, 2026
BUG: mixed int64/float64 Index operations falsely match distinct labels above 2**53 Open

Bug Closing Candidate Cross-Dtype Numerical Stability Dtype Conversions Index

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

pandas-dev/pandas#68372 · 5 comments · Opened Sep 10, 2026
BUG: IntervalIndex set ops and astype/constructor raise TypeError when passed a RangeIndex Open

pandas-dev/pandas#68343 · 1 comment · 1 assignee · Opened Sep 9, 2026
BUG: .to_latex() throws an exception in some cases Open

Bug Styler

pandas-dev/pandas#68310 · 8 comments · 1 assignee · Opened Sep 8, 2026
BUG: `RangeIndex.symmetric_difference` skips required sort when one side is empty Open

Bug Index setops

pandas-dev/pandas#68264 · 11 comments · 1 assignee · Opened Sep 6, 2026
BUG: Series/DataFrame.replace with a callable value silently stores the function instead of applying or rejecting it Open

pandas-dev/pandas#68199 · 1 comment · 1 assignee · Opened Sep 6, 2026
BUG: read_csv fails to finalize index when engine='pyarrow' and dtype is scalar (or dict without an index specified) Open

Arrow Bug IO CSV

pandas-dev/pandas#68041 · 3 comments · 1 assignee · Opened Sep 4, 2026
BUG: to_xml() export not valid for bool dtype Open

Bug IO XML

pandas-dev/pandas#68026 · 6 comments · 1 assignee · Opened Sep 4, 2026
BUG: addition of non-UTC DatetimeArray with large Timedelta returns None Open

Bug Datetime Non-Nano

pandas-dev/pandas#68009 · 3 comments · 1 assignee · Opened Sep 4, 2026
BUILD: window/meson.build never passes --shared=pandas._libs._cyutility to its extensions Open

pandas-dev/pandas#67995 · 1 comment · 1 assignee · Opened Sep 4, 2026
BUILD: pyproject.toml banned-api comment is wrong — TID251 does resolve np.random through the alias Open

pandas-dev/pandas#67994 · 2 comments · 1 assignee · Opened Sep 4, 2026
TST: test_duplicated_hashtable_impl monkeypatches _SIZE_CUTOFF on a path that never reads it Open

pandas-dev/pandas#67991 · 1 comment · 1 assignee · Opened Sep 4, 2026
CI: sanitizers environment has no pyarrow, so the read_csv pyarrow string path is never sanitized Open

Build CI

pandas-dev/pandas#67986 · 4 comments · 1 assignee · Opened Sep 4, 2026
BUG: validate_test_dependencies.py is blind to pixi [target.*.dependencies] Open

Build CI

pandas-dev/pandas#67985 · 3 comments · 1 assignee · Opened Sep 4, 2026
TST: set LC_TIME in the test body instead of skipping under skip_if_not_english_lc_time Open

Testing

pandas-dev/pandas#67984 · 1 comment · 1 assignee · Opened Sep 4, 2026
CI: pixi-version is pinned in three places and dependabot bumps none of them Open

CI

pandas-dev/pandas#67982 · 2 comments · 1 assignee · Opened Sep 4, 2026
BUG: pd.to_numeric with errors="coerce" fails to produce actual NA values when applied to dtype string[pyarrow] values Open

Arrow Bug Dtype Conversions

pandas-dev/pandas#67949 · 6 comments · 1 assignee · Opened Sep 3, 2026
`Scalar` is missing types that `.loc` and `.at` can return Open

Indexing

Difficulty 3/5 1-2 days Newbie friendliness 65/100

pandas-dev/pandas-stubs#1937 · 3 comments · Opened Sep 3, 2026
API: Add reduction methods to ExtensionArray Open

API Design ExtensionArray ExtensionArray - New Method Request

pandas-dev/pandas#67928 · 7 comments · 1 assignee · Opened Sep 2, 2026
BUG: IntervalDtype.__from_arrow__ ignores the struct-level validity bitmap Open

Arrow Bug Interval Missing-data

pandas-dev/pandas#67754 · 3 comments · 1 assignee · Opened Sep 1, 2026
BUG: IntervalArray.__arrow_array__ rejects ExtensionDtype subtypes, and ArrowIntervalType metadata cannot round-trip them Open

Arrow Bug Interval IO Parquet

pandas-dev/pandas#67753 · 2 comments · 1 assignee · Opened Sep 1, 2026
DOC: Opening a Pull Request Instructions Incorrect Open

Docs Needs Discussion

Difficulty 1/5 Under an hour Newbie friendliness 85/100

pandas-dev/pandas#67751 · 13 comments · Opened Sep 1, 2026
BUG: IndexError with certain subplot order in stacked barchart Open

Bug Visualization

pandas-dev/pandas#67726 · 6 comments · 1 assignee · Opened Sep 1, 2026
BUG: HDFStore.select with where="cat == None" returns empty DataFrame for Categorical columns instead of matching missing/NaN rows Open

Bug IO HDF5 Regression

pandas-dev/pandas#67065 · 6 comments · 1 assignee · Opened Aug 28, 2026
DOC: user guide SQL section lacks PostgreSQL (psycopg 3) recipes Open

Docs

pandas-dev/pandas#67064 · 5 comments · 1 assignee · Opened Aug 28, 2026
BUG: `Series.str.extract` with `ArrowDtype` raises on unnamed capture groups, and drops them when mixed with named ones Open

Arrow Bug Strings

pandas-dev/pandas#67024 · 3 comments · 1 assignee · Opened Aug 27, 2026
API: Restrictions on EA scalar types Open

API Design ExtensionArray Needs Discussion

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

pandas-dev/pandas#67014 · Opened Aug 26, 2026
DOC, API: `read_*` methods alignment (and `to_*`) Open

API - Consistency Docs Needs Discussion

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

pandas-dev/pandas#67012 · 4 comments · Opened Aug 26, 2026
BUG: read_csv with engine="pyarrow" and usecols orders columns as given in usecols instead of file order Open

Arrow Bug IO CSV

pandas-dev/pandas#67010 · 5 comments · 1 assignee · Opened Aug 26, 2026
BUG: read_csv with engine="pyarrow", header=None and usecols relabels columns positionally instead of keeping file positions Open

Bug IO CSV

pandas-dev/pandas#67008 · 3 comments · 1 assignee · Opened Aug 26, 2026
BUG: read_csv with integer `names` treats integer `dtype` keys as both label and position Open

Bug IO CSV Needs Discussion

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

pandas-dev/pandas#67005 · 2 comments · Opened Aug 26, 2026
`pandas.tests.extension` has no stubs Open

API Design Awaiting Response Testing

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

pandas-dev/pandas-stubs#1918 · 1 comment · Opened Aug 24, 2026
ENH: Allow assign() lambdas to optionally receive the target column as a second argument Open

Enhancement expressions Needs Discussion

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

pandas-dev/pandas#66966 · 8 comments · Opened Aug 23, 2026
BUG: rollforward/rollback accept date but their type hints reject it Open

Bug Frequency Needs Discussion

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

pandas-dev/pandas#66877 · 6 comments · Opened Aug 20, 2026
ENH: add `DatetimeIndexResampler`, `PeriodIndexResampler` and `TimedeltaIndexResampler` to `pandas.api.typing` Open

API - Consistency API Design Docs Enhancement

pandas-dev/pandas#66850 · 7 comments · 1 reaction · 1 assignee · Opened Aug 19, 2026
Commit e443dab23d03b409f5fac3a9279aba7849538ee9 Open

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

pandas-dev/asv-runner#164 · 1 comment · Opened Aug 19, 2026
Commit 14350fa162178a10d91ae90c46c4d6bc7dead1bc Open

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

pandas-dev/asv-runner#163 · 1 comment · Opened Aug 19, 2026

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