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Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more
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Pandas v1.4.0

Pandas: v1.4.0 Release

Release date:
January 22, 2022
Previous version:
v1.4.0rc0 (released January 5, 2022)
Magnitude:
3,435 Diff Delta
Contributors:
7 total committers
Data confidence:
Commits:
51 impacting commits

51 Commits in this Release

Ordered by the degree to which they evolved the repo in this version.

Backport PR #45389: REG/REF: close file handles engine-independently in read_csv (#45398)
Authored January 17, 2022
Backport PR #45449: DEPR: undo deprecation of astype(int64) for datetimelike values (#45518)
Authored January 21, 2022
Backport PR #45146: ENH: Allow callable for on_bad_lines in read_csv when engine="python" (#45264)
Authored January 8, 2022
Backport PR #45138: ENH: add `cline` to `Styler.to_latex` (#45211)
Authored January 6, 2022
Backport PR #45237: DOC: Improve doc summaries in series.rst (#45268)
Authored January 8, 2022
Backport PR #45125: BUG: Operations with SparseArray return SA with wrong indices (#45275)
Authored January 9, 2022
Backport PR #45219: MISC: Check that min versions are aligned in CI and import_optional_dependency (#45537)
Authored January 21, 2022
Backport PR #45228: DOC: comprehensive example of `Styler.to_latex` features (#45267)
Authored January 8, 2022
Backport PR #45212: CLN: suppress warnings (#45269)
Authored January 8, 2022
Backport PR #45120: CI: Migrate Python 3.10 testing to Posix GHA/Azure Pipelines (#45464)
Authored January 19, 2022
Backport PR #45208: DOC: improve IO & General Functions API reference (#45233)
Authored January 7, 2022
Backport PR #45451: Add back __array_wrap__ for dask compatibility (#45491)
Authored January 20, 2022
Backport PR #44839: REGR: allow reindexing datetimelike with upcast / raise deprecation warning (#45406)
Authored January 17, 2022
Backport PR #45524: REGR: fix period dtype <-> arrow roundtrip for pyarrow < 4 (#45541)
Authored January 22, 2022
Backport PR #45363: BUG: correctly instantiate subclassed DataFrame/Series in groupby apply (#45397)
Authored January 16, 2022
Backport PR #45214: REGR: Index(pd.array(foo), dtype=object) (#45265)
Authored January 8, 2022
Backport PR #45283: BUG: do not replace all nulls with "NaN"-string in Series index (#45473)
Authored January 19, 2022
Backport PR #45523: DEPR: restore to_frame() name=None behaviour but deprecate it (#45529)
Authored January 21, 2022
Backport PR #45334: DEPR: un-deprecate errors kwd reverts #44294 (#45343)
Authored January 15, 2022
Backport PR #45519: EA interface: rename ExtensionArray._hasnans to ._hasna (#45543)
Authored January 22, 2022
Backport PR #45377: REGR: DataFrame.reset_index with empty RangeIndex (#45394)
Authored January 16, 2022
Backport PR #44894: DOC: `MultiIndex.get_level_values` mentions implicit type casting if level contains null. (#45210)
Authored January 6, 2022
Backport PR #45274: Fix groupby any/all on an empty series/frame (#45297)
Authored January 10, 2022
Backport PR #45432: REGR: DataFrame(dict) missing columns should not be views (#45446)
Authored January 18, 2022
Backport PR #45370: DOC: add version dropdown to the online doc site (#45460)
Authored January 19, 2022
Backport PR #45244 on branch 1.4.x (TYP: Ignore numpy related issues) (#45306)
Authored January 15, 2022
Backport PR #45336: CI/DOC: replace master -> main branch (#45338)
Authored January 13, 2022
Backport PR #45522: REGR: read_fwf interpreting infer as list of colspecs when checking names length (#45530)
Authored January 21, 2022
Backport PR #45087: BUG: Timestamp.to_pydatetime losing 'fold' (#45330)
Authored January 12, 2022
Backport PR #45371: PERF: avoid SQL MetaData reflection in init #45260 (#45395)
Authored January 16, 2022
Backport PR #45496: BUG: allow DBAPI2 object #45416 (#45502)
Authored January 20, 2022
Backport PR #45204: CI: Use broader condition to maybe catch ResourceWarning from Matplotlib (#45504)
Authored January 20, 2022
Backport PR #45203: DOC: fix doctests for depr `closed` arg (#45270)
Authored January 8, 2022
Backport PR #45354: TST: xfail test_arrowparquet_options for windows (#45365)
Authored January 14, 2022
CI/TST: update pyarrow pin in windows-3.8 env / fix failing parquet test on windows (#45364) (#45450)
Authored January 18, 2022
Backport PR #45199: CI: activate azure pipelines/github actions on 1.4.x (#45201)
Authored January 5, 2022
Backport PR #45489: Bug tojson memleak (#45545)
Authored January 22, 2022
Backport PR #45355: CI: Ensure GHA uses major versions of actions (#45508)
Authored January 21, 2022
Backport PR #45426: BENCH: Fix ASV branch to main (#45447)
Authored January 18, 2022
Backport PR #45195: BLD: updated pydata-sphinx-theme to master in environment.yml (#45202)
Authored January 5, 2022

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Top Contributors in v1.4.0

meeseeksmachine
jorisvandenbossche
lithomas1
simonjayhawkins
phofl
mroeschke
pandas-development-team-79e2

Directory Browser for v1.4.0

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Release Notes Published

This release includes some new features, bug fixes, and performance improvements. We recommend that all users upgrade to this version.

See the full whatsnew for a list of all the changes. pandas 1.4.0 supports Python 3.8 and higher.

The release will be available on the defaults and conda-forge channels:

conda install -c conda-forge pandas

Or via PyPI:

python3 -m pip install --upgrade pandas

Please report any issues with the release on the pandas issue tracker.

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