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String dtype: known differences and performance considerations for "pyarrow" vs "python" storage variants

Docs

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

Status: Open.

#63105 In pandas-dev/pandas;

· jorisvandenbossche opened on Nov 13, 2025

DOC: add storage and na_value to StringDtype reference page

Docs

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

Status: Open (in progress).

pandas-dev/pandasnumber 63104

#63104 In pandas-dev/pandas;

· jorisvandenbossche opened on Nov 13, 2025

· 

3.0

BUG: StringArray with NA behaves different to numpy object array for elementwise comparisons

Bug

Compatpandas objects compatability with Numpy or Python functionspandas objects compatability with Numpy or Python functions

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

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

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

Status: Open.

#62802 In pandas-dev/pandas;

· ssche opened on Oct 22, 2025

REF/API: Move ArrowDtype(pa.foo_string()) into StringDtype(...)

API Design

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.

#62129 In pandas-dev/pandas;

· jbrockmendel opened on Aug 16, 2025

BUG: <code>pd.api.types.is_string_dtype()</code> returns inconsistent results for Categorical series vs dtype

Bug

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.

#62109 In pandas-dev/pandas;

· nsarang opened on Aug 14, 2025

BUG: raise a proper exception when str.rsplit is passed a regex and clarify the docs

Stale

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

Status: Open (in progress).

pandas-dev/pandasnumber 62035

#62035 In pandas-dev/pandas;

· hamdanal opened on Aug 3, 2025

BUG: <code>metadata</code> on <code>np.ndarray</code> of <code>np.dtype("O")</code> dtype lost when roundtripped through <code>pandas.Series</code>

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

Status: Open.

#61938 In pandas-dev/pandas;

· ilan-gold opened on Jul 24, 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: documented usage of of <code>str.split(...).str.get</code> fails on dtype <code>large_string[pyarrow]</code>

Bug

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.

#61431 In pandas-dev/pandas;

· SandroCasagrande opened on May 12, 2025

BUG(string dtype): Arithmetic operations between Series with string dtype index

API - ConsistencyInternal Consistency of API/BehaviorInternal Consistency of API/Behavior

Bug

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.

#61425 In pandas-dev/pandas;

· rhshadrach opened on May 10, 2025

BUG: <code>.str.contains()</code> regex lookbehind and lookahead fail for data type <code>string[pyarrow]</code>

Arrowpyarrow functionalitypyarrow functionality

Bug

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

Status: Open.

#60833 In pandas-dev/pandas;

· noahblakesmith opened on Feb 3, 2025

TST (string dtype): clean-up interpolate tests

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

Stale

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

Testingpandas testing functions or related to the test suitepandas testing functions or related to the test suite

Status: Open (in progress).

pandas-dev/pandasnumber 60653

#60653 In pandas-dev/pandas;

· jorisvandenbossche opened on Jan 3, 2025

· 

3.0