DOC: Clarify parentheses vs. brackets Docs good first issue

#62314 opened Sep 11, 2025 by afeld

3

DOC: NaT - "alias of NaT"; NA - "alias of <NA>" Docs Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate good first issue

#62185 opened Aug 25, 2025 by wjandrea

8

BUG: assert_frame_equal(check_dtype=False) fails when comparing two DFs containing pd.NA that only differ in dtype (object vs Int32) Bug Testing pandas testing functions or related to the test suite good first issue ExtensionArray Extending pandas with custom dtypes or arrays.

#61473 opened May 21, 2025 by michiel-de-muynck

14

BUG: CustomBusinessDay not respecting calendar Bug Frequency DateOffsets good first issue

#60647 opened Jan 2, 2025 by benmgrant

21

BUG: `Series.clip` does not work with scalar numpy arrays. Bug Needs Discussion Requires discussion from core team before further action good first issue

#59053 opened Jun 19, 2024 by randolf-scholz

6

DOC: Incorrect Source Link Docs good first issue Needs Triage Issue that has not been reviewed by a pandas team member

#58350 opened Apr 21, 2024 by gboeker

9

DOC: Enforce Numpy Docstring Validation (Parent Issue) Docs good first issue

#58063 opened Mar 29, 2024 by jordan-d-murphy

8

BUG: itemsize wrong for date32[day][pyarrow] dtype? Bug good first issue Arrow pyarrow functionality

#57948 opened Mar 21, 2024 by MarcoGorelli

8

BUG: AssertionError: Did not expect new dtype float64 to equal self.dtype float64. Please report a bug Bug Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate Categorical Categorical Data Type good first issue Needs Tests Unit test(s) needed to prevent regressions PDEP6-related related to PDEP6 (not upcasting during setitem-like Series operations)

#56329 opened Dec 4, 2023 by adrienpacifico

8

ENH: set `__module__` on top-level public objects Enhancement Output-Formatting __repr__ of pandas objects, to_string good first issue

#55178 opened Sep 17, 2023 by jorisvandenbossche

13

ERR: ``numeric_only`` in reduction operations should disallow passing non-bools Error Reporting Incorrect or improved errors from pandas good first issue Reduction Operations sum, mean, min, max, etc.

#53098 opened May 5, 2023 by phofl

7

BUG: DataFrame.rank does not return EA types when original type was an EADtype Bug Dtype Conversions Unexpected or buggy dtype conversions good first issue ExtensionArray Extending pandas with custom dtypes or arrays. Reduction Operations sum, mean, min, max, etc. pyarrow dtype retention op with pyarrow dtype -> expect pyarrow result

#52829 opened Apr 21, 2023 by tinadu0806

8

DOC: Simplify pandas theme footer Docs good first issue

#51536 opened Feb 21, 2023 by datapythonista

16

ENH: Change ExtensionOpsMixin behaviour to not add new operator method if one is already defined on the ExtensionArray class Enhancement Numeric Operations Arithmetic, Comparison, and Logical operations good first issue ExtensionArray Extending pandas with custom dtypes or arrays.

#50767 opened Jan 16, 2023 by Finndersen

5

CLN: Use dedup_names in all instances where duplicate column names are renamed IO HTML read_html, to_html, Styler.apply, Styler.applymap Clean good first issue

#50371 opened Dec 21, 2022 by datapythonista

28

Information for new contributors good first issue

#49275 opened Oct 24, 2022 by noatamir

9

DOC: Example missing in pandas.DataFrame.to_html Docs IO HTML read_html, to_html, Styler.apply, Styler.applymap good first issue

#44945 opened Dec 17, 2021 by vimaloctavius

11

BUG: Interpolate over time does not work with Int64 or Float64 Bug Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate good first issue Needs Tests Unit test(s) needed to prevent regressions NA - MaskedArrays Related to pd.NA and nullable extension arrays

#40252 opened Mar 5, 2021 by pspeter

16

DOC: add button to edit on GitHub Docs good first issue

#39859 opened Feb 17, 2021 by afeld

18

DOC: Reindexing behaviour of dataframe column-assignment missing Docs Indexing Related to indexing on series/frames, not to indexes themselves good first issue

#39845 opened Feb 16, 2021 by fish-face

11

BUG: `DataFrame.mean(axis=1)` fails but `Series.mean` works incase of pandas Nullable integer dtype Bug good first issue Needs Tests Unit test(s) needed to prevent regressions NA - MaskedArrays Related to pd.NA and nullable extension arrays Reduction Operations sum, mean, min, max, etc.

#36585 opened Sep 23, 2020 by galipremsagar

4

DOC: `.str.cat` output in case of `Index` object Docs good first issue

#35556 opened Aug 4, 2020 by galipremsagar

8

BUG: read_sql no longer works simply with SqlAlchemy selectables and a quick fix IO SQL to_sql, read_sql, read_sql_query good first issue Needs Tests Unit test(s) needed to prevent regressions

#35484 opened Jul 30, 2020 by machow

15

BUG: groupby.sum() is inconsistent with df.sum() for large integers Bug Groupby Dtype Conversions Unexpected or buggy dtype conversions good first issue Needs Tests Unit test(s) needed to prevent regressions Reduction Operations sum, mean, min, max, etc.

#34681 opened Jun 9, 2020 by tom-weiss

24

DOC: Single Document For Code Guidelines Docs Code Style Code style, linting, code_checks good first issue

#33851 opened Apr 28, 2020 by Stockfoot

21

API/BUG: freq retention in value_counts Bug Frequency DateOffsets Algos Non-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff good first issue Needs Tests Unit test(s) needed to prevent regressions freq retention User expects "freq" attribute to be preserved

#33830 opened Apr 27, 2020 by jbrockmendel

8

BUG: concat_{categorical, compat} leads to erroneous result on non-ns datetime-EA Bug Reshaping Concat, Merge/Join, Stack/Unstack, Explode good first issue ExtensionArray Extending pandas with custom dtypes or arrays. Needs Tests Unit test(s) needed to prevent regressions Non-Nano datetime64/timedelta64 with non-nanosecond resolution

#33331 opened Apr 6, 2020 by xhochy

6

WEB: Multiple "Getting Started" on pandas.io leads to different links good first issue Web pandas website

#32307 opened Feb 27, 2020 by mroeschke

20

startingMonth ignored on non-unitary Quarter periods Frequency DateOffsets Resample resample method good first issue Needs Tests Unit test(s) needed to prevent regressions

#29576 opened Nov 12, 2019 by aulemahal

7

Indexing on series where index is output from pd.cut Indexing Related to indexing on series/frames, not to indexes themselves good first issue Needs Tests Unit test(s) needed to prevent regressions

#27437 opened Jul 17, 2019 by kuchenrolle

16

`pd.groupby` seems to mutate my `pd.Grouper` in-place Groupby good first issue Needs Tests Unit test(s) needed to prevent regressions

#26564 opened May 29, 2019 by alichaudry

4

Updating value of a single row of a column using loc or at fails good first issue Needs Tests Unit test(s) needed to prevent regressions

#22040 opened Jul 24, 2018 by abhinav-upadhyay

19

[Feature Request] Add `replace` method to `Index` objects Enhancement good first issue replace replace method

#19495 opened Feb 1, 2018 by jolespin

10

Raise ValueError for read_json and orient='table' With Numeric Column Names Enhancement Error Reporting Incorrect or improved errors from pandas IO JSON read_json, to_json, json_normalize good first issue

#19129 opened Jan 8, 2018 by WillAyd

20

DOC: improve docs for broadcasting behavior Docs Numeric Operations Arithmetic, Comparison, and Logical operations good first issue

#18857 opened Dec 19, 2017 by jakevdp

16

DOC: section on caveats of storing lists inside DataFrame/Series Docs good first issue Nested Data Data where the values are collections (lists, sets, dicts, objects, etc.).

#17027 opened Jul 19, 2017 by chris-b1

13

DOC: pivot function Docs Reshaping Concat, Merge/Join, Stack/Unstack, Explode good first issue

#16578 opened Jun 2, 2017 by jesrael

6

Non-inclusive partial string indexing on DatetimeIndex Docs Datetime Datetime data dtype Indexing Related to indexing on series/frames, not to indexes themselves good first issue

#16571 opened Jun 1, 2017 by linar-jether

6

Series.map on a Categorical with a function only processes each unique value once Docs Categorical Categorical Data Type Apply Apply, Aggregate, Transform, Map good first issue

#15706 opened Mar 16, 2017 by Kodiologist

3

DOC: min_itemsize for HDFStore append for encoded strings Docs IO HDF5 read_hdf, HDFStore good first issue

#14601 opened Nov 7, 2016 by johanneshk

9

BUG: need to block split when filling na good first issue Needs Tests Unit test(s) needed to prevent regressions

#14407 opened Oct 12, 2016 by jreback

10

DOC: floating point precision on writing/reading to csv Docs IO CSV read_csv, to_csv good first issue

#13159 opened May 12, 2016 by FBartlett

11

append a categorical with different categories to the existing Docs Categorical Categorical Data Type good first issue

#12509 opened Mar 2, 2016 by dneise

5

DOC: document optional arguments on plot submethods Docs Visualization plotting good first issue

#11042 opened Sep 10, 2015 by shoyer

3

DOC: splitting the IO docs into separate pages Docs good first issue

#10446 opened Jun 26, 2015 by jorisvandenbossche

6

With an external grouper, there is no way to access the grouped value in a DataFrame(...).groupby(...).apply(...) workflow Docs Groupby good first issue

#9545 opened Feb 24, 2015 by brianthelion

15

DOC: freeze old whatsnew notes? Docs good first issue

#6856 opened Apr 10, 2014 by jorisvandenbossche

20