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ENH: Add first_inverted and last_inverted options to keep in DataFrame.duplicated

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

duplicatedduplicated, drop_duplicatesduplicated, drop_duplicates

Enhancement

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

Status: Open.

#60394 In pandas-dev/pandas;

· tommycarstensen opened on Nov 22, 2024

DOC: Add example of drop_duplicates dropping a first-level

Docs

duplicatedduplicated, drop_duplicatesduplicated, drop_duplicates

Status: Open.

#47813 In pandas-dev/pandas;

· smarie opened on Jul 21, 2022

BUG: duplicated() returns different results on consecutive runs!

Bug

duplicatedduplicated, drop_duplicatesduplicated, drop_duplicates

Status: Open.

#46864 In pandas-dev/pandas;

· emsi opened on Apr 25, 2022

TYP: Improve typing on pandas.core.algorithms.duplicated()

duplicatedduplicated, drop_duplicatesduplicated, drop_duplicates

Typingtype annotations, mypy/pyright type checkingtype annotations, mypy/pyright type checking

Status: Open.

#42604 In pandas-dev/pandas;

· Dr-Irv opened on Jul 19, 2021

ENH: consider using sets and not maps for isin, unique and duplicated

duplicatedduplicated, drop_duplicatesduplicated, drop_duplicates

Enhancement

isinisin methodisin method

PerformanceMemory or execution speed performanceMemory or execution speed performance

Status: Open.

#39799 In pandas-dev/pandas;

· realead opened on Feb 13, 2021

BUG: DataFrame.drop_duplicates confuses NULL bytes

Bug

duplicatedduplicated, drop_duplicatesduplicated, drop_duplicates

hashinghash_pandas_objecthash_pandas_object

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

Status: Open.

#34551 In pandas-dev/pandas;

· marco-neumann-by opened on Jun 3, 2020

Feature request: Allow the subset argument of dropna and drop_duplicates to take a single label

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

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

duplicatedduplicated, drop_duplicatesduplicated, drop_duplicates

Status: Open.

#32654 In pandas-dev/pandas;

· tsoernes opened on Mar 12, 2020

Unstable hashtable / duplicated algo for object dtype

Bug

duplicatedduplicated, drop_duplicatesduplicated, drop_duplicates

Status: Open.

#27035 In pandas-dev/pandas;

· jorisvandenbossche opened on Jun 25, 2019

API: Allow use of keep="all" in duplicated

API Design

duplicatedduplicated, drop_duplicatesduplicated, drop_duplicates

Status: Open.

#23251 In pandas-dev/pandas;

· svenharris opened on Oct 20, 2018

BUG: df.duplicated treats None as np.nan in object columns

Bug

duplicatedduplicated, drop_duplicatesduplicated, drop_duplicates

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

Status: Open.

#21720 In pandas-dev/pandas;

· h-vetinari opened on Jul 3, 2018

BUG: drop_duplicates() doesn't work for object dtype series containing numpy nans

Bug

duplicatedduplicated, drop_duplicatesduplicated, drop_duplicates

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

Status: Open.

#16632 In pandas-dev/pandas;

· ran404 opened on Jun 8, 2017

PERF: use StringHashTable for value_counts / duplicated with strings

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

duplicatedduplicated, drop_duplicatesduplicated, drop_duplicates

PerformanceMemory or execution speed performanceMemory or execution speed performance

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

Status: Open.

#14860 In pandas-dev/pandas;

· jreback opened on Dec 12, 2016