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BUG: concat on axis with both different and duplicate labels raising error

Bug

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

Status: Closed (completed).

#6963 In pandas-dev/pandas;

· by jorisvandenbossche was closed on Dec 24, 2020

DataFrame.to_latex() should honor na_rep after formatter.

Bug

IO LaTeXto_latexto_latex

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

Status: Closed (completed).

#9046 In pandas-dev/pandas;

· by moorepants was closed on Oct 24, 2020

CLN/TST: move consoliate sort_index to core/generic.py

API Design

InternalsRelated to non-user accessible pandas implementationRelated to non-user accessible pandas implementation

RefactorInternal refactoring of codeInternal refactoring of code

Status: Closed (completed).

#8283 In pandas-dev/pandas;

· by jreback was closed on Sep 15, 2020

ENH: decode for Categoricals

API Design

CategoricalCategorical Data TypeCategorical Data Type

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Closed (completed).

#8628 In pandas-dev/pandas;

· by fkaufer was closed on Nov 18, 2020

API: timeseries accessors naming convention

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

API Design

DatetimeDatetime data dtypeDatetime data dtype

good first issue

Status: Closed (completed).

#9606 In pandas-dev/pandas;

· by jreback was closed on Oct 29, 2020

Python 3 writing to_csv file ignores encoding argument.

Bug

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

IO CSVread_csv, to_csvread_csv, to_csv

UnicodeUnicode stringsUnicode strings

Status: Closed (completed).

#13068 In pandas-dev/pandas;

· by graingert was closed on Aug 7, 2020

COMPAT: should an empty string match a format (or just be NaT)

good first issue

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

Status: Closed (completed).

#13044 In pandas-dev/pandas;

· by jreback was closed on Nov 19, 2020

pd.Period off by hundred of years for dates past ~2263

good first issue

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

PeriodPeriod data typePeriod data type

Status: Closed (completed).

#13346 In pandas-dev/pandas;

· by eyurtsev was closed on Oct 5, 2020

PERF/COMPAT: use kahan summation in .rolling(..).sum()

AlgosNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diffNon-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff

Numeric OperationsArithmetic, Comparison, and Logical operationsArithmetic, Comparison, and Logical operations

PerformanceMemory or execution speed performanceMemory or execution speed performance

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Closed (completed).

#13254 In pandas-dev/pandas;

· by jreback was closed on Sep 15, 2020

s.loc[[]] raises error (only) if index is not unique

Bug

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

MultiIndex

Status: Closed (completed).

#13691 In pandas-dev/pandas;

· by toobaz was closed on Oct 16, 2020

to_html ignores na_rep when float_format set

Bug

IO HTMLread_html, to_html, Styler.apply, Styler.applymapread_html, to_html, Styler.apply, Styler.applymap

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

Status: Closed (completed).

#13828 In pandas-dev/pandas;

· by paulperry was closed on Oct 24, 2020

BUG: index.name not preserved in concat in case of unequal object index

Bug

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

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

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

Status: Closed (completed).

#13475 In pandas-dev/pandas;

· by dllahr was closed on Aug 7, 2020

Series.to_string ignores empty lines at the start/end when index=False

Bug

good first issue

IO DataIO issues that don't fit into a more specific labelIO issues that don't fit into a more specific label

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

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

Status: Closed (completed).

#13653 In pandas-dev/pandas;

· by alberthdev was closed on Sep 30, 2020

ENH: cross join in merge() and join()

Enhancement

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

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

Status: Closed (completed).

#5401 In pandas-dev/pandas;

· by RomanPekar was closed on Nov 26, 2020

columns selection after groupby reset group_keys to True

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

Bug

Groupby

Status: Closed (completed).

#9959 In pandas-dev/pandas;

· by ruoyu0088 was closed on Aug 31, 2020

Groupby built by columns : cannot use .head() or .apply()

Bug

Groupby

Status: Closed (completed).

#9772 In pandas-dev/pandas;

· by JonasAbernot was closed on Nov 13, 2020

rolling_mean returns small negative value on Series with non-negative values

Bug

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Closed (completed).

#10319 In pandas-dev/pandas;

· by ahu2012 was closed on Sep 15, 2020

Resample yields empty groups

good first issue

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

Status: Closed (completed).

#10603 In pandas-dev/pandas;

· by JonasAbernot was closed on Aug 21, 2020

DOC: Distinguish between different types of boolean indexing

Docs

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

Status: Closed (completed).

#10492 In pandas-dev/pandas;

· by jcjf was closed on Oct 8, 2020

csv_read() fails on properly decoding latin-1(i.e. non utf8) encoded file from URL

Bug

IO CSVread_csv, to_csvread_csv, to_csv

IO NetworkLocal or Cloud (AWS, GCS, etc.) IO IssuesLocal or Cloud (AWS, GCS, etc.) IO Issues

UnicodeUnicode stringsUnicode strings

Status: Closed (completed).

#10424 In pandas-dev/pandas;

· by BotoKopo was closed on Aug 17, 2020

Bug when computing rolling_mean with extreme value

API Design

Docs

Numeric OperationsArithmetic, Comparison, and Logical operationsArithmetic, Comparison, and Logical operations

Status: Closed (completed).

#11645 In pandas-dev/pandas;

· by julienvienne was closed on Sep 18, 2020

ENH: Return RangeIndex for .difference and .symmetric_difference

Enhancement

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

Status: Closed (completed).

#12034 In pandas-dev/pandas;

· by jreback was closed on Oct 7, 2020

PERF: Poor numerical stability of rolling_kurt and rolling_skew

Numeric OperationsArithmetic, Comparison, and Logical operationsArithmetic, Comparison, and Logical operations

PerformanceMemory or execution speed performanceMemory or execution speed performance

Windowrolling, ewma, expandingrolling, ewma, expanding

Status: Closed (completed).

#6929 In pandas-dev/pandas;

· by jaimefrio was closed on Nov 9, 2020

Calling shift(n != 0) on an empty DatetimeIndex raises an IndexError

Bug

DatetimeDatetime data dtypeDatetime data dtype

Status: Closed (completed).

#14811 In pandas-dev/pandas;

· by chazmo03 was closed on Sep 30, 2020

API: Index.append behaviour with categoricals

API Design

CategoricalCategorical Data TypeCategorical Data Type

Enhancement

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

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

Status: Closed (completed).

#14586 In pandas-dev/pandas;

· by jorisvandenbossche was closed on Nov 29, 2020