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BUG: <code>read_csv()</code> silently ignores out-of-range integers

Bug

IO CSVread_csv, to_csvread_csv, to_csv

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

Status: Open.

#55232 In pandas-dev/pandas;

· davidchall opened on Sep 21, 2023

REGR: groupby.transform with a UDF performance

Copy / view semantics

Groupby

PerformanceMemory or execution speed performanceMemory or execution speed performance

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

Transformationse.g. cumsum, diff, ranke.g. cumsum, diff, rank

Status: Open.

#55256 In pandas-dev/pandas;

· rhshadrach opened on Sep 23, 2023

REGR: Index.astype(&lt;numpy string dtype&gt;) started failing

Astype

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

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

Status: Open.

#50127 In pandas-dev/pandas;

· jorisvandenbossche opened on Dec 8, 2022

BUG: DatetimeIndexResamplerGroupby as_index interaction with .agg()

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

Bug

Groupby

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

Timestamppd.Timestamp and associated methodspd.Timestamp and associated methods

Status: Open.

#52397 In pandas-dev/pandas;

· 1112114641 opened on Apr 4, 2023

BUG: Cannot convert existing column to categorical

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.

#52593 In pandas-dev/pandas;

· Zahlii opened on Apr 11, 2023

BUG: json that could be read by pandas 1.5.3 cannot be read by 2.0.0

IO JSONread_json, to_json, json_normalizeread_json, to_json, json_normalize

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

Status: Open.

#52595 In pandas-dev/pandas;

· rikardn opened on Apr 11, 2023

BUG: (regression? v2 vs v1.5) ValueError: Big-endian buffer not supported on little-endian compiler

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

Status: Open.

#53234 In pandas-dev/pandas;

· st-bender opened on May 15, 2023

BUG: <code>DataFrame.var()</code> with <code>axis=1</code> returns <code>object</code> Series instead of <code>float64</code> Series?

Bug

Reduction Operationssum, mean, min, max, etc.sum, mean, min, max, etc.

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

Status: Open.

#55194 In pandas-dev/pandas;

· itholic opened on Sep 19, 2023

BUG: <code>df1.merge(df2, on='ds', how='outer')</code> not convert column <code>ds</code> to the highest resolution datetime type of the two dfs

Bug

Non-Nanodatetime64/timedelta64 with non-nanosecond resolutiondatetime64/timedelta64 with non-nanosecond resolution

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

Status: Open.

#55212 In pandas-dev/pandas;

· seanslma opened on Sep 20, 2023