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BUG: Implicit conversion to float64 with isin()

Bug

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

isinisin methodisin method

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

Status: Open.

#61676 In pandas-dev/pandas;

· pbrochart opened on Jun 18, 2025

BUG: <code>to_numeric</code> fails to convert a Pyarrow Decimal series containing NA values.

Arrowpyarrow functionalitypyarrow functionality

Bug

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Status: Open.

#61641 In pandas-dev/pandas;

· kzvezdarov opened on Jun 12, 2025

BUG: Fix infer_dtype result for float with embedded pd.NA

Bug

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Missing-datanp.nan, pd.NaT, pd.NA, dropna, isnull, interpolatenp.nan, pd.NaT, pd.NA, dropna, isnull, interpolate

Status: Open (in progress).

pandas-dev/pandasnumber 61624

#61624 In pandas-dev/pandas;

· heoh opened on Jun 10, 2025

BUG: infer_dtype result for float with embedded pd.NA

Bug

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Missing-datanp.nan, pd.NaT, pd.NA, dropna, isnull, interpolatenp.nan, pd.NaT, pd.NA, dropna, isnull, interpolate

Status: Open.

#61621 In pandas-dev/pandas;

· MarkusZimmerDLR opened on Jun 10, 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: Passing string[pyarrow] to the dtype parameter of e.g. csv_read() does produce a string type Series

Arrowpyarrow functionalitypyarrow functionality

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

IO CSVread_csv, to_csvread_csv, to_csv

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

StringsString extension data type and string dataString extension data type and string data

Status: Open.

#61496 In pandas-dev/pandas;

· ClauPet opened on May 26, 2025

BUG: NA are coerced in to NaN by concat

Bug

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Missing-datanp.nan, pd.NaT, pd.NA, dropna, isnull, interpolatenp.nan, pd.NaT, pd.NA, dropna, isnull, interpolate

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

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

Status: Open.

#61303 In pandas-dev/pandas;

· davetapley opened on Apr 17, 2025

BUG: Inconsistency when converting week PeriodIndex into DatetimeIndex with astype("datetime64[ns]")

Bug

DatetimeDatetime data dtypeDatetime data dtype

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

PeriodPeriod data typePeriod data type

Status: Open.

#61177 In pandas-dev/pandas;

· dbalabka opened on Mar 25, 2025

BUG(?): rolling sum with pyarrow types results in float64 instead of preserving integer type

Arrowpyarrow functionalitypyarrow functionality

Bug

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Open.

#61144 In pandas-dev/pandas;

· MarcoGorelli opened on Mar 18, 2025

BUG: Fix return type of loc/iloc

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

Status: Open (in progress).

pandas-dev/pandasnumber 61054

#61054 In pandas-dev/pandas;

· sanggon6107 opened on Mar 4, 2025

 ·  

3.0

BUG: Poor GroupBy Performance with ArrowDtype(...) wrapped types

Arrowpyarrow functionalitypyarrow functionality

Bug

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

Status: Open.

#60861 In pandas-dev/pandas;

· kzvezdarov opened on Feb 5, 2025

BUG: loc[] returns object type instead of float

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

Status: Open.

#60600 In pandas-dev/pandas;

· metazoic opened on Dec 23, 2024

 ·  

3.0