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Issues list

ENH: Add first_inverted and last_inverted options to keep in DataFrame.duplicated Closing Candidate May be closeable, needs more eyeballs duplicated duplicated, drop_duplicates Enhancement Needs Discussion Requires discussion from core team before further action
#60394 opened Nov 22, 2024 by tommycarstensen
1 of 3 tasks
4
DOC: Add example of drop_duplicates dropping a first-level Docs duplicated duplicated, drop_duplicates
#47813 opened Jul 21, 2022 by smarie
1 of 3 tasks
2
BUG: duplicated() returns different results on consecutive runs! Bug duplicated duplicated, drop_duplicates
#46864 opened Apr 25, 2022 by emsi
2 of 3 tasks
4
TYP: Improve typing on pandas.core.algorithms.duplicated() duplicated duplicated, drop_duplicates Typing type annotations, mypy/pyright type checking
#42604 opened Jul 19, 2021 by Dr-Irv
1
ENH: consider using sets and not maps for isin, unique and duplicated duplicated duplicated, drop_duplicates Enhancement isin isin method Performance Memory or execution speed performance
#39799 opened Feb 13, 2021 by realead
2
BUG: DataFrame.drop_duplicates confuses NULL bytes Bug duplicated duplicated, drop_duplicates hashing hash_pandas_object Strings String extension data type and string data
#34551 opened Jun 3, 2020 by marco-neumann-by
12
Feature request: Allow the subset argument of dropna and drop_duplicates to take a single label API - Consistency Internal Consistency of API/Behavior Deprecate Functionality to remove in pandas duplicated duplicated, drop_duplicates
#32654 opened Mar 12, 2020 by tsoernes
2
Unstable hashtable / duplicated algo for object dtype Bug duplicated duplicated, drop_duplicates
#27035 opened Jun 25, 2019 by jorisvandenbossche
6
API: Allow use of keep="all" in duplicated API Design duplicated duplicated, drop_duplicates
#23251 opened Oct 20, 2018 by svenharris
1
7
BUG: df.duplicated treats None as np.nan in object columns Bug duplicated duplicated, drop_duplicates Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate
#21720 opened Jul 3, 2018 by h-vetinari
7
BUG: drop_duplicates() doesn't work for object dtype series containing numpy nans Bug duplicated duplicated, drop_duplicates Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate
#16632 opened Jun 8, 2017 by ran404
1
PERF: use StringHashTable for value_counts / duplicated with strings Algos Non-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff duplicated duplicated, drop_duplicates Performance Memory or execution speed performance Strings String extension data type and string data
#14860 opened Dec 12, 2016 by jreback
2 tasks
@lithomas1
2
BUG: duplicated() on a empty DataFrame or a DataFrame with an empty subset of columns with a non-empty index Bug duplicated duplicated, drop_duplicates Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate
#12869 opened Apr 11, 2016 by sebov
1
15
df.duplicated and drop_duplicates raise TypeError with unhashable values. Bug duplicated duplicated, drop_duplicates Nested Data Data where the values are collections (lists, sets, dicts, objects, etc.).
#12693 opened Mar 22, 2016 by Abrosimov-a-a
5
ENH: add axis argument to .drop_duplicates and .duplicated duplicated duplicated, drop_duplicates Enhancement
#11250 opened Oct 6, 2015 by 121onto
15
ENH: drop_duplicates(consecutive=True) to drop only consecutive duplicates API Design duplicated duplicated, drop_duplicates Enhancement
#10540 opened Jul 10, 2015 by bwillers
5
ProTip! What’s not been updated in a month: updated:<2025-04-18.