pandas-dev/pandas issues and pull requests

#60353 - BUG: dataframe.to_hdf function incompatible with timestamps of format "datetime64[us, UTC]"

Issue - State: closed - Opened by ChristophWiesmeyr about 1 year ago - 5 comments
Labels: Bug, IO HDF5, Timezones, Needs Tests

#60346 - TST: Add test for `pd.Timestamp` DST transition

Pull Request - State: closed - Opened by KevsterAmp about 1 year ago - 1 comment
Labels: Needs Tests, hashing, Timestamp

#60346 - TST: Add test for `pd.Timestamp` DST transition

Pull Request - State: closed - Opened by KevsterAmp about 1 year ago
Labels: Needs Tests, hashing, Timestamp

#60209 - TST: Add test for `feather` I/O with historical out-of-bounds `datetime` values

Pull Request - State: closed - Opened by jasonmokk about 1 year ago
Labels: IO Parquet, Needs Tests

#60209 - TST: Add test for `feather` I/O with historical out-of-bounds `datetime` values

Pull Request - State: closed - Opened by jasonmokk about 1 year ago
Labels: IO Parquet, Needs Tests

#60084 - BUG: arithmetic can break equality-hash invariant for Timestamp during DST transition

Issue - State: closed - Opened by Kxnr about 1 year ago - 15 comments
Labels: Bug, good first issue, Needs Tests, hashing, Timestamp

#59904 - BUG: pd.read_csv date parsing not working with dtype_backend="pyarrow" and missing values

Issue - State: closed - Opened by mhabets about 1 year ago - 12 comments
Labels: Bug, Missing-data, IO CSV, good first issue, Needs Tests, Arrow

#59519 - TST: Added test for date_range for bug GH#57456

Pull Request - State: closed - Opened by matsidzi over 1 year ago - 1 comment
Labels: Needs Tests, datetime.date

#59519 - TST: Added test for date_range for bug GH#57456

Pull Request - State: closed - Opened by matsidzi over 1 year ago
Labels: Needs Tests, datetime.date

#58446 - BUG: `groupby.agg` with `as_index=False` and duplicate columns in `by` fails with `pd.NamedAgg`.

Issue - State: closed - Opened by sfc-gh-rdurrani over 1 year ago - 5 comments
Labels: Groupby, Apply, good first issue, Needs Tests

#57457 - BUG: Endianness problem with weird data types and shape

Issue - State: closed - Opened by ilan-gold almost 2 years ago - 6 comments
Labels: Bug, good first issue, Needs Tests

#56935 - TST: Add test groupby transform no column

Pull Request - State: closed - Opened by DevpriyaDave almost 2 years ago - 3 comments
Labels: Groupby, Needs Tests, Stale, Transformations

#56935 - TST: Add test groupby transform no column

Pull Request - State: closed - Opened by DevpriyaDave almost 2 years ago - 3 comments
Labels: Groupby, Needs Tests, Stale, Transformations

#56853 - BUG: Insert then delete column into MultiIndex with timestamps leads to RecursionError

Issue - State: closed - Opened by traubms almost 2 years ago - 7 comments
Labels: Bug, Indexing, MultiIndex, good first issue, Needs Tests

#56758 - TST: assert that informative error is raised when offset not supported as a period frequency is passed to DataFrame.asfreq

Pull Request - State: closed - Opened by aram-cinnamon almost 2 years ago - 3 comments
Labels: Needs Tests

#56758 - TST: assert that informative error is raised when offset not supported as a period frequency is passed to DataFrame.asfreq

Pull Request - State: closed - Opened by aram-cinnamon almost 2 years ago - 3 comments
Labels: Needs Tests

#56712 - BUG: Interchange protocol implementation does not handle `timestamp[ns][pyarrow]` type correctly

Issue - State: closed - Opened by stinodego almost 2 years ago - 4 comments
Labels: good first issue, Needs Tests, Interchange

#56384 - TST: Added a test for groupby.prod

Pull Request - State: closed - Opened by ccccjone almost 2 years ago - 2 comments
Labels: Bug, Groupby, Needs Tests, Reduction Operations

#56283 - BUG: `.style.bar` doesn't work with missing pyarrow values

Issue - State: closed - Opened by mattharrison almost 2 years ago - 1 comment
Labels: good first issue, Needs Tests, Styler

#56145 - TST: add test to verify if SystemExit is raised correctly.

Pull Request - State: closed - Opened by HaruguchiKazuto about 2 years ago - 1 comment
Labels: Groupby, Categorical, Needs Tests

#56024 - BUG: setitem using `loc` not aligning on index?

Issue - State: closed - Opened by MarcoGorelli about 2 years ago - 12 comments
Labels: Bug, Indexing, Needs Tests

#55969 - BUG: Strange behavior when accessing datetime.date index with np.datetime64

Issue - State: open - Opened by yavitzour about 2 years ago - 2 comments
Labels: Bug, Indexing, good first issue, Needs Tests

#55193 - TST: Test GroupBy.getitem with a column from grouper

Pull Request - State: closed - Opened by ihsansecer about 2 years ago - 1 comment
Labels: Groupby, Needs Tests

#54836 - TST: Add tests for DataFrame/Series.value_counts with missing categories

Issue - State: closed - Opened by rhshadrach about 2 years ago - 2 comments
Labels: Algos, Categorical, good first issue, Needs Tests

#54409 - BUG: loc fails with tz_aware DateTimeIndex

Issue - State: closed - Opened by 0x26res over 2 years ago - 5 comments
Labels: Bug, Indexing, Timezones, good first issue, Needs Tests

#54347 - BUG: .groupby() produces MultiIndex with NaN in levels instead of encoded in codes

Issue - State: closed - Opened by Tolker-KU over 2 years ago - 5 comments
Labels: Groupby, MultiIndex, Needs Tests

#54211 - TST: add a test with freq=1MS to increase coverage of shift

Pull Request - State: closed - Opened by natmokval over 2 years ago - 1 comment
Labels: Timeseries, Needs Tests

#54191 - BUG: `convert_dtypes(dtype_backend="pyarrow")` converts `"timestamp[ms][pyarrow]"` to `"timestamp[ns][pyarrow]"`

Issue - State: closed - Opened by randolf-scholz over 2 years ago - 5 comments
Labels: good first issue, Needs Tests

#53358 - BUG: `Series.replace` doesn't update `CategoricalDtype` when `inplace=True` in pandas-2.0

Issue - State: open - Opened by galipremsagar over 2 years ago - 6 comments
Labels: good first issue, Needs Tests

#53000 - TST: Add tests for `repr(pd.Period)`

Issue - State: closed - Opened by smarie over 2 years ago
Labels: Output-Formatting, Period, Needs Tests

#52827 - BUG: int64[pyarrow] throws error when rounded

Issue - State: closed - Opened by mplatzer over 2 years ago - 6 comments
Labels: Bug, Needs Tests, Upstream issue, Arrow

#52810 - Added test to confrim categorical perservation with merge

Pull Request - State: closed - Opened by agodinez01 over 2 years ago - 2 comments
Labels: Reshaping, Categorical, Needs Tests, Stale, Sprints

#52657 - BUG: ArrowNotImplementedError when setting multiindex with dictionary[pyarrow] columns

Issue - State: closed - Opened by aprandin over 2 years ago - 3 comments
Labels: Bug, Needs Tests, Upstream issue, Arrow

#51500 - BUG: Unexpected behavior math operations using multiindexes

Issue - State: closed - Opened by AJZw almost 3 years ago - 8 comments
Labels: Groupby, MultiIndex, Needs Tests

#50864 - BUG: numpy.maximum(pandas.Timestamp(...), pandas.Series(..., dtype='datetime64')) fails with TypeError

Issue - State: closed - Opened by hottwaj almost 3 years ago - 6 comments
Labels: good first issue, Needs Tests

#50751 - TEST: dropna() doesn't fall into infinite loop

Pull Request - State: closed - Opened by natmokval almost 3 years ago - 8 comments
Labels: Needs Tests, Subclassing

#50383 - BUG: Inconsistency with grouping columns in agg

Issue - State: closed - Opened by rhshadrach almost 3 years ago - 3 comments
Labels: Bug, Groupby, good first issue, Needs Tests

#50372 - BUG: Can't mix tuples and strings in column names with Numpy>=1.24

Issue - State: closed - Opened by adrien-berchet almost 3 years ago - 6 comments
Labels: good first issue, Needs Tests

#50100 - BUG: GroupBy.ngroup dropna=False inconsistency when using Categorical

Issue - State: closed - Opened by batterseapower almost 3 years ago - 12 comments
Labels: Groupby, good first issue, Needs Tests

#49052 - BUG: df.where(ea) coerces to object, rather than nullable dtype like ser.where(ea) does

Issue - State: open - Opened by MarcoGorelli about 3 years ago - 2 comments
Labels: Bug, Missing-data, good first issue, Needs Tests

#47971 - BUG: pivot_table downcasting dtypes even if not necessary

Issue - State: closed - Opened by phofl over 3 years ago - 5 comments
Labels: Bug, Reshaping, good first issue, Needs Tests

#47832 - BUG: Out of bound dates can be saved to feather but not loaded

Issue - State: closed - Opened by adrienpacifico over 3 years ago - 10 comments
Labels: Bug, IO Parquet, Needs Tests

#47639 - BUG: `fillna` cannot convert NaN to None

Issue - State: open - Opened by david-cortes over 3 years ago - 5 comments
Labels: Bug, Missing-data, good first issue, Needs Tests

#47382 - Mixed dtypes of column index for data frames raises en error

Issue - State: closed - Opened by ChristopheBernard over 3 years ago - 5 comments
Labels: Numeric Operations, ExtensionArray, Needs Tests, Index

#46573 - BUG: prod and groupby.prod behave differently

Issue - State: open - Opened by tf401 over 3 years ago - 9 comments
Labels: Bug, Groupby, good first issue, Needs Tests, Reduction Operations

#44104 - BUG: DataFrame.update do not preserve string dtype

Issue - State: open - Opened by ali-cetin-4ss about 4 years ago - 5 comments
Labels: Bug, Dtype Conversions, Strings, good first issue, Needs Tests, pyarrow dtype retention, combine/combine_first/update

#44078 - BUG: groupby.rolling.corr incorrect/fails when grouping columns contain tuples

Issue - State: closed - Opened by rhshadrach about 4 years ago - 5 comments
Labels: Groupby, Needs Tests, Window, cov/corr

#44050 - BUG: Hexbin plots does not display x label and xtick labels in pandas 1.3.3

Issue - State: closed - Opened by stelios-c about 4 years ago - 2 comments
Labels: Bug, Visualization, Needs Tests

#43996 - BUG: v1.3.0 Introduces Unexpected Retyping of Categorical Column with NaN inside

Issue - State: closed - Opened by DamianBarabonkovQC about 4 years ago - 1 comment
Labels: Bug, Missing-data, Categorical, Needs Tests

#43412 - BUG: a duplicated index would cause groupby.fillna(method='ffill') a wrong result

Issue - State: closed - Opened by mIgLLL about 4 years ago - 7 comments
Labels: Bug, Groupby, good first issue, Needs Tests

#43164 - BUG: options `date_dayfirst` and `date_yearfirst` conflict

Issue - State: closed - Opened by attack68 over 4 years ago - 6 comments
Labels: Docs, Datetime, Needs Tests

#42016 - BUG: groupby with dropna=False and 'unique' aggregate creates duplicated index

Issue - State: closed - Opened by mhabets over 4 years ago - 4 comments
Labels: Bug, Groupby, Apply, good first issue, Needs Tests

#37491 - BUG: Inconsistent data type conversion with .sum

Issue - State: closed - Opened by candalfigomoro about 5 years ago - 12 comments
Labels: Dtype Conversions, good first issue, Needs Tests, Reduction Operations

#37093 - BUG: groupby-transform produces NaN for series keys with as_index=False

Issue - State: closed - Opened by thomas-reineking-by about 5 years ago - 6 comments
Labels: Groupby, Apply, good first issue, Needs Tests

#35484 - BUG: read_sql no longer works simply with SqlAlchemy selectables and a quick fix

Issue - State: open - Opened by machow over 5 years ago - 19 comments
Labels: IO SQL, good first issue, Needs Tests

#35331 - BUG: np.argwhere on pandas series

Issue - State: closed - Opened by rossbar over 5 years ago - 4 comments
Labels: good first issue, Needs Tests

#35202 - BUG: `len(df.groupby(..., dropna=False))` raises ValueError: Categorical categories cannot be null

Issue - State: closed - Opened by ssche over 5 years ago - 13 comments
Labels: Bug, Groupby, good first issue, Needs Tests

#34681 - BUG: groupby.sum() is inconsistent with df.sum() for large integers

Issue - State: open - Opened by tom-weiss over 5 years ago - 21 comments
Labels: Bug, Groupby, Dtype Conversions, good first issue, Needs Tests, Reduction Operations

#34174 - BUG: pd.concat inconsistent behaviour with empty and tz-aware Series

Issue - State: closed - Opened by dave-cz over 5 years ago - 4 comments
Labels: Bug, Reshaping, Timezones, Needs Tests

#34164 - BUG: grouping with categorical interval columns

Issue - State: closed - Opened by antipisa over 5 years ago - 11 comments
Labels: good first issue, Needs Tests

#33457 - REGR: setting column with setitem should not modify existing array inplace

Issue - State: closed - Opened by jorisvandenbossche over 5 years ago - 34 comments
Labels: Indexing, Regression, Needs Tests, Copy / view semantics, Closing Candidate

#33331 - BUG: concat_{categorical, compat} leads to erroneous result on non-ns datetime-EA

Issue - State: open - Opened by xhochy over 5 years ago - 5 comments
Labels: Bug, Reshaping, ExtensionArray, Needs Tests, Non-Nano

#31899 - Combining two Series of dtype `Int8` converts them to `Int64`

Issue - State: open - Opened by MarcoGorelli almost 6 years ago - 3 comments
Labels: Bug, Dtype Conversions, Numeric Operations, good first issue, Needs Tests, combine/combine_first/update

#31516 - query works for string data type columns with missing values but not for boolean indexing

Issue - State: open - Opened by tdpetrou almost 6 years ago - 2 comments
Labels: Strings, good first issue, ExtensionArray, Needs Tests, expressions

#29707 - .loc assignment with empty label list should not convert dtypes

Issue - State: closed - Opened by jondo about 6 years ago - 8 comments
Labels: Indexing, Dtype Conversions, Needs Tests

#29576 - startingMonth ignored on non-unitary Quarter periods

Issue - State: open - Opened by aulemahal about 6 years ago - 6 comments
Labels: Frequency, Resample, good first issue, Needs Tests

#29023 - pd.concat inconsistent coercion of None depending of value in rows

Issue - State: closed - Opened by ConorSheehan1 about 6 years ago - 5 comments
Labels: Reshaping, good first issue, Needs Tests

#28558 - pd.read_json With convert_axes Produces Different Index Type than Empty Frame

Issue - State: closed - Opened by WillAyd about 6 years ago - 2 comments
Labels: Missing-data, IO JSON, good first issue, Needs Tests

#27994 - DataFrame.drop with empty DatetimeIndex behaves differently than passing empty Index

Issue - State: closed - Opened by katsuya-horiuchi over 6 years ago - 10 comments
Labels: good first issue, Needs Tests, DataFrame

#27437 - Indexing on series where index is output from pd.cut

Issue - State: open - Opened by kuchenrolle over 6 years ago - 16 comments
Labels: Indexing, good first issue, Needs Tests

#27220 - json_normalize does not handle nested meta paths when also using a nested record_path

Issue - State: closed - Opened by connormcmk over 6 years ago - 8 comments
Labels: IO JSON, good first issue, Needs Tests

#26568 - BUG: pivot_table with margins=True and numeric columns is buggy

Issue - State: closed - Opened by jschendel over 6 years ago - 3 comments
Labels: Reshaping, good first issue, Needs Tests

#26475 - df.groupby on a column with complex numbers is broken

Issue - State: closed - Opened by basnijholt over 6 years ago - 5 comments
Labels: Bug, Groupby, Complex, good first issue, Needs Tests

#25548 - Inconsistent behaviour when assigning to series?

Issue - State: closed - Opened by mwiebusch78 over 6 years ago - 9 comments
Labels: Indexing, good first issue, Needs Tests

#24247 - sort_index(..., ascending=False, ...) overrides sort_remaining behavior with multiindex

Issue - State: closed - Opened by alkasm almost 7 years ago - 2 comments
Labels: good first issue, Needs Tests

#22613 - Series.str.decode() turns arrays of strings to NaN and fails on byte strings

Issue - State: closed - Opened by abrakababra about 7 years ago - 10 comments
Labels: Strings, good first issue, Needs Tests

#22257 - get_group(...) fails for groupby(...) based on a function

Issue - State: closed - Opened by Kimonode over 7 years ago - 4 comments
Labels: Bug, Groupby, Regression, MultiIndex, good first issue, Needs Tests

#22247 - MultiIndex Bug Copying Values Incorrectly When Adding Values To Index

Issue - State: closed - Opened by JonahJ over 7 years ago - 4 comments
Labels: good first issue, Needs Tests

#22040 - Updating value of a single row of a column using loc or at fails

Issue - State: open - Opened by abhinav-upadhyay over 7 years ago - 16 comments
Labels: good first issue, Needs Tests

#21658 - BUG: .values for objects containing categoricals with box-able categories

Issue - State: closed - Opened by jorisvandenbossche over 7 years ago - 3 comments
Labels: good first issue, Needs Tests

#21340 - Groupby on a column with tuples creates a multiindex, yielding unexpected behaviour.

Issue - State: closed - Opened by masasin over 7 years ago - 7 comments
Labels: Bug, Groupby, MultiIndex, good first issue, Needs Tests, Nested Data

#20883 - Unexpected results when filtering with .isin (some fields contain python datastructures)

Issue - State: closed - Opened by atc0m over 7 years ago - 12 comments
Labels: good first issue, Needs Tests

#19791 - slow execution with internal error visible upon interruption for indexing with dataframe: TypeError: cannot convert bool to an floatblock

Issue - State: closed - Opened by denfromufa almost 8 years ago - 6 comments
Labels: good first issue, Needs Tests

GitHub / pandas-dev/pandas issues and pull requests