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Issues list

DOC: Series.update throws a FutureWarning about def[col] = df[col].method but .update returns None and works inplace Copy / view semantics Docs Needs Info Clarification about behavior needed to assess issue
#59788 opened Sep 13, 2024 by spawn-guy
1 task done
3
BUG: CoW does not seem to work on an index with duplicated labels Closing Candidate May be closeable, needs more eyeballs Copy / view semantics Performance Memory or execution speed performance
#59272 opened Jul 18, 2024 by arnaudlegout
2 of 3 tasks
@sgysherry
10
API: Make Series.array a read-only NumpyExtensionEA when applicable Copy / view semantics
#58007 opened Mar 26, 2024 by mroeschke 3.0
1
2
Potential perf regressions introduced by Copy-on-Write Copy / view semantics Performance Memory or execution speed performance Regression Functionality that used to work in a prior pandas version
#57431 opened Feb 15, 2024 by rhshadrach
22 of 50 tasks
9
BUG: ChainedAssignmentError for CoW not working for chained inplace methods when passing *args or **kwargs Bug Copy / view semantics
#56456 opened Dec 11, 2023 by jorisvandenbossche
1
DEPR (PDEP-7/CoW): deprecate and remove copy keyword (except in constructors) Copy / view semantics Deprecate Functionality to remove in pandas
#56022 opened Nov 17, 2023 by jorisvandenbossche 3.0
@phofl
9
CoW warning mode for cases that will change behaviour Copy / view semantics Deprecate Functionality to remove in pandas
#56019 opened Nov 17, 2023 by jorisvandenbossche
11 of 14 tasks
2.3
Evaluate using WeakSet for reference tracking Copy / view semantics Enhancement
#55631 opened Oct 22, 2023 by phofl
3 tasks
1
REGR: groupby.transform with a UDF performance Copy / view semantics Groupby Performance Memory or execution speed performance Regression Functionality that used to work in a prior pandas version Transformations e.g. cumsum, diff, rank
#55256 opened Sep 23, 2023 by rhshadrach 2.2.3
12
API: with CoW, should every new Series/DataFrame object also have its own new Index objects? API Design Copy / view semantics Index Related to the Index class or subclasses
#53721 opened Jun 19, 2023 by jorisvandenbossche 2.3
1
1
Copy-on-Write (CoW): index labels are still shared mutable state API Design Copy / view semantics Index Related to the Index class or subclasses
#53529 opened Jun 5, 2023 by tswast
2 of 3 tasks
1
@jorisvandenbossche
8
ENH: switch to copy=False by default when DataFrame is constructed from dict of Series/Index for CoW Constructors Series/DataFrame/Index/pd.array Constructors Copy / view semantics Enhancement Needs Discussion Requires discussion from core team before further action
#52967 opened Apr 27, 2023 by phofl
1 of 3 tasks
3.0
2
BUG: CoW and np.asarray leads to surprising issues Bug Copy / view semantics
#52823 opened Apr 21, 2023 by bashtage
9
CoW: Investigate copy=False internally in Series constructor Copy / view semantics
#52510 opened Apr 7, 2023 by phofl
BUG: ChainedAssignmentError for CoW not working when setitem is called from cython Bug Copy / view semantics
#51315 opened Feb 10, 2023 by jorisvandenbossche
3
API/BUG: pd.concat doesn't copy indexes if with axis=1 and copy=True when they are the same Bug Copy / view semantics Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#50673 opened Jan 11, 2023 by lithomas1
3
Copy-on-Write (PDEP-7) follow-up overview issue Copy / view semantics Master Tracker High level tracker for similar issues
#48998 opened Oct 7, 2022 by jorisvandenbossche
21 of 38 tasks
3
PERF: Memory duplication spotted when dropping columns/axis from a dataframe with inplace=True Copy / view semantics Performance Memory or execution speed performance
#48682 opened Sep 21, 2022 by ArcRiiad
3 tasks done
10
BUG: Change in series copy behavior in 1.5 Bug Copy / view semantics
#48664 opened Sep 20, 2022 by anthonyaag
3 tasks done
6
BUG: Setting values on a multiindex df, via loc, does nothing on 1.4.x Bug Copy / view semantics Indexing Related to indexing on series/frames, not to indexes themselves Regression Functionality that used to work in a prior pandas version Warnings Warnings that appear or should be added to pandas
#46983 opened May 10, 2022 by ghost
2 of 3 tasks
6
BUG: Unexpected change of behavior on DataFrame type float32 between pandas versions. Copy / view semantics Warnings Warnings that appear or should be added to pandas
#46552 opened Mar 29, 2022 by carlosan1708
3 tasks done
18
BUG: should constructing Index from a Series make a copy? Bug Copy / view semantics Index Related to the Index class or subclasses
#42934 opened Aug 8, 2021 by jorisvandenbossche
8
BUG: Direct renaming of 1 column seems to be accepted, but only old name is working Bug Copy / view semantics Index Related to the Index class or subclasses
#38547 opened Dec 17, 2020 by MarianD
1 of 3 tasks
8
BUG: df1.values is df1_shallow_copy.values returns false Bug Copy / view semantics
#36571 opened Sep 23, 2020 by TommasoBendinelli
2 of 3 tasks
5
REGR: setting column with setitem should not modify existing array inplace Closing Candidate May be closeable, needs more eyeballs Copy / view semantics Indexing Related to indexing on series/frames, not to indexes themselves Needs Tests Unit test(s) needed to prevent regressions Regression Functionality that used to work in a prior pandas version
#33457 opened Apr 10, 2020 by jorisvandenbossche
2
34
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