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ENH: Consistent NA handling in <code>unique()</code>, and <code>nunique()</code>

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

Enhancement

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

Status: Open.

#61209 In pandas-dev/pandas;

· olek-osikowicz opened on Mar 31, 2025

PERF: index.unique much slower than get_level_values.drop_duplicates

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

Closing CandidateMay be closeable, needs more eyeballsMay be closeable, needs more eyeballs

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Open.

#60213 In pandas-dev/pandas;

· jacek-pliszka opened on Nov 6, 2024

ENH: Should groupby's <code>value_counts</code> sorts on <code>count</code> before <code>proportion</code> is computed

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

Enhancement

Groupby

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

Status: Open.

#59725 In pandas-dev/pandas;

· sfc-gh-joshi opened on Sep 5, 2024

BUG: MultiIndex.factorize fails if index is 0-length

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

Bug

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

Status: Open.

#57517 In pandas-dev/pandas;

· batterseapower opened on Feb 20, 2024

BUG: Can not select in MultiIndex with NaN

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

Bug

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

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

Status: Open.

#56366 In pandas-dev/pandas;

· moi90 opened on Dec 6, 2023

DEPR: DataFrame.value_counts(sort=False) sorts

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

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

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

Status: Open.

#56007 In pandas-dev/pandas;

· rhshadrach opened on Nov 16, 2023

ENH: Add a name parameter to value_counts()

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

Enhancement

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

Status: Open.

#55121 In pandas-dev/pandas;

· n-splv opened on Sep 13, 2023

BUG: pd.Series.describe ignores include, exclude arguments

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

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

Status: Open.

#54193 In pandas-dev/pandas;

· natalymr opened on Jul 19, 2023

BUG: Axial inconsistency of pandas.diff

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

Bug

Status: Open.

#52579 In pandas-dev/pandas;

· psads-git opened on Apr 10, 2023

PERF: groupby.value_counts

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

Enhancement

Groupby

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Open.

#51750 In pandas-dev/pandas;

· rhshadrach opened on Mar 3, 2023

BUG: When applying <code>Series.clip</code> to ordered categorical data, the outcome is different from what is expected

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

Bug

CategoricalCategorical Data TypeCategorical Data Type

Status: Open.

#49217 In pandas-dev/pandas;

· vitalizzare opened on Oct 20, 2022

BUG: set_index on more than 1 column changes boolean values

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

Bug

hashinghash_pandas_objecthash_pandas_object

MultiIndex

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

Status: Open.

#46987 In pandas-dev/pandas;

· alonme opened on May 10, 2022