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TRACKER: new default String dtype (pyarrow-backed, numpy NaN semantics)

API Design

Arrowpyarrow functionalitypyarrow functionality

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

Status: Open.

#54792 In pandas-dev/pandas;

· jorisvandenbossche opened on Aug 28, 2023

· 

3.1

Information for new contributors

good first issue

Status: Open.

#49275 In pandas-dev/pandas;

· noatamir opened on Oct 24, 2022

BUG: <code>Series.replace</code> converts <code>np.nan</code> into <code>pd.NaT</code> implicitly

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

RegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas version

replacereplace methodreplace method

Status: Open.

#48034 In pandas-dev/pandas;

· ng-henry opened on Aug 11, 2022

BUG: AttributeError: 'bool' object has no attribute 'to_numpy' in "mask_missing" method of core/missing.py

Bug

ConstructorsSeries/DataFrame/Index/pd.array ConstructorsSeries/DataFrame/Index/pd.array Constructors

RegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas version

replacereplace methodreplace method

SubclassingSubclassing pandas objectsSubclassing pandas objects

Status: Open.

#47101 In pandas-dev/pandas;

· rainnnnny opened on May 24, 2022

BUG: <code>DataFrame.loc</code> is not consistent with <code>DataFrame.__setitem__</code> when used with 2D numpy array

Bug

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

RegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas version

Status: Open.

#46544 In pandas-dev/pandas;

· anmyachev opened on Mar 28, 2022

BUG: concat doesn't preserve attrs (as alternative for append deprecated in 1.4)

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

Enhancement

metadata_metadata, .attrs_metadata, .attrs

Status: Open.

#45824 In pandas-dev/pandas;

· MarcoGorelli opened on Feb 4, 2022

BUG: Inconsistent assignment of <code>NAT</code> values to datetime columns in <code>MultiIndex</code>

Bug

DatetimeDatetime data dtypeDatetime data dtype

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

MultiIndex

RegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas version

TimedeltaTimedelta data typeTimedelta data type

Status: Open.

#43351 In pandas-dev/pandas;

· galipremsagar opened on Sep 1, 2021

PERF: concat of pyarrow string array does not rechunk

Arrowpyarrow functionalitypyarrow functionality

Enhancement

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

PerformanceMemory or execution speed performanceMemory or execution speed performance

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

Status: Open.

#42357 In pandas-dev/pandas;

· jreback opened on Jul 3, 2021

BUG: behavior change in dataframe.shift(, freq=infer) when upgrading from pandas 1.1.5 to 1.2.x

Bug

FrequencyDateOffsetsDateOffsets

RegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas version

Status: Open.

#40799 In pandas-dev/pandas;

· laurent-mutricy opened on Apr 6, 2021

BUG: Series.fillna is altering None values of unspecified columns

Bug

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

SeriesSeries data structureSeries data structure

Status: Open.

#40498 In pandas-dev/pandas;

· RSchweiger opened on Mar 18, 2021

BUG: Scatterplot x-axis label disappears with colorscale when using matplotlib backend

Bug

Visualizationplottingplotting

Status: Open.

#36064 In pandas-dev/pandas;

· discdiver opened on Sep 2, 2020

different behaviour of df.isin() in 1.0.5/1.1.0, when df contains None

Bug

isinisin methodisin method

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

RegressionFunctionality that used to work in a prior pandas versionFunctionality that used to work in a prior pandas version

Status: Open.

#35565 In pandas-dev/pandas;

· johny-b opened on Aug 5, 2020