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BUG: df.astype converts to datetime64[ns] inconsistently with respect to dayfirst

Bug

datetime.datestdlib datetime.date supportstdlib datetime.date support

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

Status: Open.

#60964 In pandas-dev/pandas;

· cgflex opened on Feb 19, 2025

BUG: round not functioning as expected

Bug

DataFrameDataFrame data structureDataFrame data structure

Status: Open.

#55114 In pandas-dev/pandas;

· galipremsagar opened on Sep 13, 2023

BUG: concatenating time series with non ns unit leads to dataframe with missing data

Bug

FrequencyDateOffsetsDateOffsets

Needs TestsUnit test(s) needed to prevent regressionsUnit test(s) needed to prevent regressions

ReshapingConcat, Merge/Join, Stack/Unstack, ExplodeConcat, Merge/Join, Stack/Unstack, Explode

Status: Open.

#58471 In pandas-dev/pandas;

· jorgehv opened on Apr 29, 2024

no warning with invalid pd.set_option('display.max_colwidth')

Enhancement

Error ReportingIncorrect or improved errors from pandasIncorrect or improved errors from pandas

good first issue

Output-Formatting__repr__ of pandas objects, to_string__repr__ of pandas objects, to_string

Status: Open.

#16097 In pandas-dev/pandas;

· jkornblum opened on Apr 22, 2017

DOC: Fix docs for various offset constructors

Docs

FrequencyDateOffsetsDateOffsets

Status: Open.

#52431 In pandas-dev/pandas;

· Dr-Irv opened on Apr 5, 2023

BUG: <code>Index.drop_duplicates()</code> is inconsistent for unhashable values

Bug

IndexRelated to the Index class or subclassesRelated to the Index class or subclasses

Status: Open.

#60925 In pandas-dev/pandas;

· camriddell opened on Feb 13, 2025

raise TypeError when function returns object-like results

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Open.

#61529 In pandas-dev/pandas;

· michael2015tse opened on Jun 1, 2025

BUG: PerformanceWarning when agg with pd.NamedAgg and as_index=False

ApplyApply, Aggregate, Transform, MapApply, Aggregate, Transform, Map

Bug

Needs InfoClarification about behavior needed to assess issueClarification about behavior needed to assess issue

WarningsWarnings that appear or should be added to pandasWarnings that appear or should be added to pandas

Status: Open.

#61628 In pandas-dev/pandas;

· xma08 opened on Jun 10, 2025

ENH: Columns formatted as "Text" in Excel are read as numbers

Enhancement

IO Excelread_excel, to_excelread_excel, to_excel

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Status: Open.

#61539 In pandas-dev/pandas;

· pranay-sa opened on Jun 3, 2025

BUG: use of iloc with heterogeneous DataFrame sometimes performs undocumented conversions

Bug

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Status: Open.

#61537 In pandas-dev/pandas;

· illbebach opened on Jun 2, 2025

BUG: One item lists are assigned into dataframes as single items

Bug

IndexingRelated to indexing on series/frames, not to indexes themselvesRelated to indexing on series/frames, not to indexes themselves

Nested DataData where the values are collections (lists, sets, dicts, objects, etc.).Data where the values are collections (lists, sets, dicts, objects, etc.).

Status: Open.

#16864 In pandas-dev/pandas;

· elielhojman opened on Jul 9, 2017

pd.io.formats.format.DataFrameFormatter issue: columns not truncating properly

Enhancement

Output-Formatting__repr__ of pandas objects, to_string__repr__ of pandas objects, to_string

Status: Open.

#16911 In pandas-dev/pandas;

· bsolomon1124 opened on Jul 13, 2017