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GitHub / pandas-dev/pandas issues and pull requests

Labelled with: Bug

#62792 - BUG: HDF5 file stores hardcoded pandas version "0.15.2" instead of actual pandas version

Issue - State: open - Opened by grzanka about 1 month ago - 1 comment
Labels: Bug, Needs Triage

#62787 - BUG: Enabling Copy on Write with DataFrame.replace Raises Exception with np.nan as replacement value

Issue - State: open - Opened by achapkowski about 1 month ago - 1 comment
Labels: Bug, Needs Triage

#62711 - BUG: pandera check fails with pandas `KeyError` on certain columns starting with version 2.3.3

Issue - State: open - Opened by melohr about 1 month ago - 3 comments
Labels: Bug, Needs Triage

#62687 - API/DEPR: disallow casting nan-float to bool

Issue - State: open - Opened by jbrockmendel about 1 month ago - 1 comment
Labels: Bug, Needs Triage

#62656 - BUG: fix regex numeric group replacement in PyArrow string arrays

Pull Request - State: open - Opened by zishan044 about 1 month ago - 1 comment
Labels: Bug, Arrow

#62622 - BUG: boolean indexing gets different results during multiple runnings

Issue - State: closed - Opened by fengxh0628 about 2 months ago
Labels: Bug, Needs Triage

#62617 - BUG: incorrect string parsing leads to segfault

Issue - State: open - Opened by leolavaur about 2 months ago
Labels: Bug, Needs Triage

#62611 - BUG: Drop duplicates bug when using pyarrow (version 21.0.0) backend

Issue - State: open - Opened by flori-ko about 2 months ago - 8 comments
Labels: Bug, duplicated, Closing Candidate, Arrow

#62595 - BUG: Multiplying a series of strings with a boolean different for arrow vs. python

Issue - State: open - Opened by Dr-Irv about 2 months ago
Labels: Bug, Needs Triage

#62531 - BUG: Parsing a CSV file with string that looks like a number

Issue - State: closed - Opened by fffej about 2 months ago - 3 comments
Labels: Bug, Needs Triage

#62524 - BUG: Inconsistent runtime typing for Index[num] * list[timestamp]

Issue - State: open - Opened by cmp0xff about 2 months ago
Labels: Bug, Needs Triage

#62520 - BUG: Regression in Series.pow with all-NA `double[pyarrow]` values in pandas 3.x

Issue - State: closed - Opened by TomAugspurger about 2 months ago - 7 comments
Labels: Bug, Regression, Numeric Operations, good first issue, Arrow

#62517 - BUG: `DataFrame.add(Series, axis=0)` mis-broadcasts with numpy 2.3 on wide DataFrames

Issue - State: open - Opened by lukashergt about 2 months ago
Labels: Bug, Needs Triage

#62502 - BUG: Take method of NumpyExtensionArray now returns another extension array with the correct dtype.

Pull Request - State: open - Opened by aijams about 2 months ago - 1 comment
Labels: Bug, Algos, ExtensionArray

#62501 - BUG: Inconsistent behavior of Groupby with None values with filter

Issue - State: open - Opened by chiiyeh about 2 months ago
Labels: Bug, Needs Triage

#62498 - BUG: avoid validation error for ufunc with string[python] array

Pull Request - State: closed - Opened by jorisvandenbossche about 2 months ago
Labels: Bug, Strings

#62497 - BUG: Merge_asof fails for unknow reason

Issue - State: open - Opened by igjayanth about 2 months ago
Labels: Bug, Needs Triage

#62490 - BUG: rolling().first() and rolling().last() don't work

Issue - State: open - Opened by k0ck about 2 months ago
Labels: Bug, Needs Triage

#62477 - BUG: incorrect `cumsum` results for pyarrow on windows

Issue - State: open - Opened by MarcoGorelli about 2 months ago
Labels: Bug, Needs Triage

#62473 - BUG: "boolean value of NA is ambiguous" when doing iloc on nullable integer series

Issue - State: open - Opened by MarcoGorelli about 2 months ago
Labels: Bug, Needs Triage

#62472 - BUG: FloatingArray.__setitem__ accepts FloatingArray as key

Issue - State: open - Opened by jbrockmendel about 2 months ago
Labels: Bug, Needs Triage

#62467 - BUG: flex op with ExtensionArray and fill_value

Issue - State: open - Opened by jbrockmendel about 2 months ago
Labels: Bug, Needs Triage

#62462 - BUG: cannot use index to set values in `.iloc` for `Int64[pyarrow]` Series

Issue - State: closed - Opened by MarcoGorelli about 2 months ago - 2 comments
Labels: Bug, Indexing, Regression, Arrow

#62448 - BUG: NumpyEA[uint8].take([-1], allow_fill=True) nonsense result

Issue - State: open - Opened by jbrockmendel about 2 months ago
Labels: Bug, Needs Triage

#62443 - BUG: Dataframe.aggregate has inconsistent behaviour for empty dataframe

Issue - State: open - Opened by flori-ko 2 months ago
Labels: Bug, Needs Triage

#62410 - BUG: fix bug in str.match for Arrow backend with optional groups

Pull Request - State: closed - Opened by jorisvandenbossche 2 months ago
Labels: Bug, Strings, Arrow

#62370 - BUG: None in dtype=bool Series does not behave like 3-valued logic

Issue - State: open - Opened by Tarun2605 2 months ago
Labels: Bug, Needs Triage

#62354 - BUG: Imported floats from Stata do not round correctly

Issue - State: closed - Opened by CoreyBurger 2 months ago - 1 comment
Labels: Bug, IO Stata, Needs Triage

#62344 - BUG: cast_pointwise_result with BooleanDtype and all-NA values

Issue - State: closed - Opened by jbrockmendel 2 months ago - 1 comment
Labels: Bug, Dtype Conversions, NA - MaskedArrays

#62343 - BUG: _get_common_dtype with date32[pyarrow] and null[pyarrow]

Issue - State: open - Opened by jbrockmendel 2 months ago
Labels: Bug, Needs Triage

#62342 - BUG: inconsistent comparison results when using PyArrow backend.

Issue - State: closed - Opened by lenardkoomen-fin 2 months ago - 1 comment
Labels: Bug, Needs Triage

#62340 - BUG: NaN categorical in multi-level column gets replaced in to_excel output

Issue - State: open - Opened by niclas-muller 2 months ago - 4 comments
Labels: Bug, IO Excel, MultiIndex

#62337 - BUG: factorize does not preserve extension dtypes

Issue - State: open - Opened by batterseapower 2 months ago - 5 comments
Labels: Bug, Algos, ExtensionArray, Index

#62328 - Backport PR #62283 on branch 2.3.x (BUG: fix pyarrow string regex replacement)

Pull Request - State: closed - Opened by meeseeksmachine 2 months ago
Labels: Bug, Strings, Arrow

#62316 - BUG: Inconsistent multiplication of bool times Timedelta

Issue - State: open - Opened by Dr-Irv 2 months ago - 7 comments
Labels: Bug, Numeric Operations, Timedelta

#62310 - BUG: Addition/subtracting `pd.Timedelta` constructed from hour offset gives wrong results

Issue - State: closed - Opened by christianfosli 2 months ago - 18 comments
Labels: Bug, Numeric Operations, Timedelta, Frequency

#62307 - BUG: `to_datetime` inconsistant between Series & DataFrame with timestamps

Issue - State: open - Opened by ldouteau 3 months ago
Labels: Bug, Needs Triage

#62305 - BUG: Timestamp.normalize overflow

Pull Request - State: closed - Opened by jbrockmendel 3 months ago
Labels: Bug, Timestamp

#62290 - BUG: Fix incorrect FutureWarning for logical ops on pyarrow bool Series (#62260)

Pull Request - State: closed - Opened by Tarun2605 3 months ago - 14 comments
Labels: Bug, Numeric Operations, Arrow

#62277 - BUG: DatetimeIndex.get_indexer(timestamp[pyarrow])

Issue - State: open - Opened by jbrockmendel 3 months ago
Labels: Bug, Needs Triage

#62264 - BUG: pd.json_normalize error when non-string keys are used in arguments

Issue - State: closed - Opened by ybressler 3 months ago - 4 comments
Labels: Bug, IO JSON, Needs Triage

#62260 - BUG: Incorrect Future warning between operation of pyarrow boolean series

Issue - State: open - Opened by flori-ko 3 months ago
Labels: Bug, Needs Triage

#62233 - BUG:

Issue - State: open - Opened by ry99765-commits 3 months ago
Labels: Bug, Needs Triage

#62213 - BUG: Using unstacking with `sort=False` after grouping with `sort=False` incorrectly shuffles data

Issue - State: closed - Opened by Tenceto 3 months ago - 2 comments
Labels: Bug, Needs Triage

#62205 - BUG: `record_prefix` ignored when `record_path` is empty

Issue - State: open - Opened by JensHeinrich 3 months ago
Labels: Bug, Needs Triage

#62204 - BUG: memory leak in to_json when converting DateTime values

Issue - State: open - Opened by swt2c 3 months ago
Labels: Bug, Needs Triage

#62158 - API: indexing dates-with-datetime64

Issue - State: open - Opened by jbrockmendel 3 months ago
Labels: Bug, Needs Triage

#62154 - BUG: resampling with origin=end_date includes extra elements in the bucket

Issue - State: open - Opened by vasil-pashov 3 months ago
Labels: Bug, Needs Triage

#62150 - BUG: Inconsistent behaviour when merging reset-ed MultiIndex dataframe

Issue - State: open - Opened by renkeven 3 months ago
Labels: Bug, Needs Triage

#62146 - BUG: Fails to Build on Raspberry Pi 3 (tested both 2.1.4 and 2.3.1)

Issue - State: open - Opened by luckylinux 3 months ago
Labels: Bug, Needs Triage

#62140 - BUG: type error in `df.attrs.update()`

Issue - State: closed - Opened by janosh 3 months ago - 1 comment
Labels: Bug, Needs Triage

#62134 - BUG: groupby.apply() drops _metadata from subclassed DataFrame

Issue - State: closed - Opened by JBGreisman 3 months ago - 1 comment
Labels: Bug, Groupby, Apply, metadata, Subclassing

#62121 - BUG: Addition of __set_module__ breaks PyCharm PyDev debugger functionalities

Issue - State: open - Opened by dangreb 3 months ago
Labels: Bug, Needs Triage

#62111 - BUG: to_csv uses inconsistent microsecond format for datetimes with timezones

Issue - State: open - Opened by insperatum 3 months ago
Labels: Bug, Needs Triage

#62100 - BUG: `tz_localize(None)` incorrectly converts timestamps when using `pyarrow` dtypes

Issue - State: open - Opened by dhirschfeld 3 months ago
Labels: Bug, Needs Triage

#62063 - BUG: is_scalar(Enum) gives False

Issue - State: open - Opened by cmp0xff 4 months ago
Labels: Bug, Needs Triage

#62052 - BUG: Pandas mean function fails on type pd.NA with axis=1 but not axis=0

Issue - State: closed - Opened by peterktrinh 4 months ago
Labels: Bug, Needs Triage

#62048 - API: Series[Float64] == False

Issue - State: closed - Opened by jbrockmendel 4 months ago - 2 comments
Labels: Bug, Needs Triage

#62036 - BUG: rank with object dtype and small values

Issue - State: closed - Opened by jbrockmendel 4 months ago - 4 comments
Labels: Bug, Missing-data, NA - MaskedArrays, Transformations

#62025 - BUG: Change default of observed in Series.groupby

Pull Request - State: closed - Opened by rhshadrach 4 months ago
Labels: Bug, Groupby, Categorical

#62024 - BUG: NaN vs NA in mixed reduction

Issue - State: open - Opened by jbrockmendel 4 months ago
Labels: Bug, Needs Triage

#62022 - DEPR: convert_dtypes keywords

Issue - State: open - Opened by jbrockmendel 4 months ago
Labels: Bug, Needs Triage

#62018 - BUG: pd.api.types.is_signed_integer_dtype(np.floating) throws TypeError

Issue - State: open - Opened by windiana42 4 months ago
Labels: Bug, Needs Triage

#61976 - BUG: infer_dtype returns "mixed" for complex and pd.NA mix

Issue - State: open - Opened by yuanx749 4 months ago
Labels: Bug, Needs Triage

#61972 - BUG: Series.replace with CoW when made from an Index

Pull Request - State: closed - Opened by rhshadrach 4 months ago
Labels: Bug, replace, Copy / view semantics

#61952 - BUG: Using `Series.str.fullmatch()` with a compiled regex fails with arrow strings

Issue - State: open - Opened by Dr-Irv 4 months ago
Labels: Bug, Needs Triage

#61951 - BUG: Implicit upcast to float64 for large series (more than 1000000 rows)

Issue - State: open - Opened by stertingen 4 months ago
Labels: Bug, Needs Triage

#61948 - BUG: Replacement fails after NA value with PyArrow-backed strings

Issue - State: closed - Opened by rhshadrach 4 months ago - 1 comment
Labels: Bug, replace, Arrow

#61946 - BUG: Fix Series.str.contains with compiled regex on Arrow string dtype

Pull Request - State: closed - Opened by Aniketsy 4 months ago - 8 comments
Labels: Bug, Strings, Arrow

#61942 - BUG: Using `Series.str.contains()` with a compiled regex and arrow strings fails

Issue - State: closed - Opened by Dr-Irv 4 months ago
Labels: Bug, Strings, Arrow

#61937 - BUG: `Index` accepts lists as values

Issue - State: open - Opened by Dr-Irv 4 months ago
Labels: Bug, Needs Triage

#61932 - BUG: Unexpected Code Segment Executed, Causing Logical Error

Issue - State: closed - Opened by LAUNAHC 4 months ago - 2 comments
Labels: Bug, Needs Triage

#61926 - BUG: Merge fails on pyarrow datetime columns

Issue - State: closed - Opened by Meet1995 4 months ago - 14 comments
Labels: Bug, Datetime, Reshaping, good first issue, Arrow

#61914 - BUG: Convertors not running when reading a dataframe from excel using calamine engine

Issue - State: open - Opened by ramadanomar 4 months ago
Labels: Bug, Needs Triage

#61910 - BUG: .describe() doesn't work for EAs #61707

Pull Request - State: closed - Opened by kernelism 4 months ago - 4 comments
Labels: Bug, ExtensionArray

#61898 - BUG: `AttributeError` in `pd.eval()` when calling attribute after binary operation

Issue - State: closed - Opened by ryantam626 4 months ago - 2 comments
Labels: Bug, Needs Triage

#61896 - BUG: windows-specific `rank` bug

Issue - State: open - Opened by MarcoGorelli 4 months ago
Labels: Bug, Needs Triage

#61894 - BUG: fix padding for string categories in CategoricalIndex repr

Pull Request - State: open - Opened by jorisvandenbossche 4 months ago
Labels: Bug, Output-Formatting

#61893 - BUG: Fix concat dtype preservation through concat

Pull Request - State: closed - Opened by adrienpacifico 4 months ago - 2 comments
Labels: Bug, Reshaping, Categorical

#61889 - BUG: make to_json with JSON Table Schema work correctly with string dtype

Issue - State: closed - Opened by jorisvandenbossche 4 months ago - 4 comments
Labels: Bug, IO JSON, Strings

#61873 - BUG:

Issue - State: open - Opened by mas-4 4 months ago
Labels: Bug, Needs Triage

#61866 - BUG: __rand__ operation not implemented for ExtensionArrays that are not Numpy

Issue - State: open - Opened by eicchen 4 months ago
Labels: Bug, Needs Triage

#61863 - BUG: describe(include=..) fails with unrelated error if provided data types are not present

Issue - State: closed - Opened by jorisvandenbossche 4 months ago - 3 comments
Labels: Bug, Error Reporting

#61855 - BUG: If both index and axis are passed to DataFrame.drop, raise a clear error

Pull Request - State: closed - Opened by khemkaran10 4 months ago - 4 comments
Labels: Bug, Error Reporting

#61844 - ENH: Backport free-threading support to 2.3

Issue - State: open - Opened by crusaderky 4 months ago
Labels: Bug, Needs Triage