v2023.09.0

This release continues work on the new :py:class:xarray.Coordinates object, allows to provide preferred_chunks when
reading from netcdf files, enables :py:func:xarray.apply_ufunc to handle missing core dimensions and fixes several bugs.

Thanks to the 24 contributors to this release: Alexander Fischer, Amrest Chinkamol, Benoit Bovy, Darsh Ranjan, Deepak Cherian,
Gianfranco Costamagna, Gregorio L. Trevisan, Illviljan, Joe Hamman, JR, Justus Magin, Kai Mühlbauer, Kian-Meng Ang, Kyle Sunden,
Martin Raspaud, Mathias Hauser, Mattia Almansi, Maximilian Roos, András Gunyhó, Michael Niklas, Richard Kleijn, Riulinchen,
Tom Nicholas and Wiktor Kraśnicki.

What's Changed

• [skip-ci] dev whats-new by @dcherian in #8098
• Refactor update coordinates to better handle multi-coordinate indexes by @benbovy in #8094
• Better error message when trying to set an index from a scalar coordinate by @benbovy in #8109
• Fix merge with compat=minimal (coord names) by @benbovy in #8104
• Fix Codecov by @headtr1ck in #7142
• Better default behavior of the Coordinates constructor by @benbovy in #8107
• Document drop_variables in open_mfdataset by @jerabaul29 in #8083
• adapted the docstring of xarray.DataArray.differentiate by @afisc in #8127
• Add Coordinates.assign() method by @benbovy in #8102
• Fix pandas' interpolate(fill_value=) error by @max-sixty in #8139
• Fix doctests: pandas 2.1 MultiIndex repr with nan by @benbovy in #8141
• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci in #8145
• Cut middle version from CI by @max-sixty in #8156
• Dirty workaround for mypy 1.5 error by @benbovy in #8142
• tests: Update US/Eastern timezone to America/New_York by @LocutusOfBorg in #8153
• Docs page on internal design by @TomNicholas in #7991
• Fix tokenize with empty attrs by @malmans2 in #8101
• Consistently report all dimensions in error messages if invalid dimensions are given by @mgunyho in #8079
• Fix typos by @kianmeng in #8163
• to_stacked_array: better error msg & refactor by @mathause in #8130
• fix miscellaneous numpy=2.0 errors by @keewis in #8117
• Bump actions/checkout from 3 to 4 by @dependabot in #8169
• Don't try to sort hashable, map to string by @Illviljan in #8172
• Implement preferred_chunks for netcdf 4 backends by @mraspaud in #7948
• Fix assignment with .loc by @dranjan in #8067
• improve typing of DataArray and Dataset reductions by @rhkleijn in #6746
• FIX: handle NaT values in dt-accessor by @kmuehlbauer in #8084
• Fix PeriodIndex deprecation in xarray tests by @max-sixty in #8182
• Display data returned in apply_ufunc error message by @max-sixty in #8179
• Set dev version above released version by @max-sixty in #8181
• Remove setup.cfg in favor of pyproject.toml by @max-sixty in #8183
• Fix comment alignment in pyproject.toml by @max-sixty in #8185
• fix the failing docs by @keewis in #8188
• Fix pytest markers by @max-sixty in #8191
• Fix several warnings in the tests by @headtr1ck in #8184
• FIX: use "krogh" as interpolator method-string instead of "krog" by @kmuehlbauer in #8187
• Update contourf call check for mpl 3.8 by @ksunden in #8186
• Fix static typing with Matplotlib 3.8 by @headtr1ck in #8030
• Exclude dimensions used in faceting from squeeze by @wkrasnicki in #8174
• Remove requirements.txt by @max-sixty in #8196
• Preserve nanosecond resolution when encoding/decoding times by @kmuehlbauer in #7827
• Allow apply_ufunc to ignore missing core dims by @max-sixty in #8138
• Adjust ufunc error message by @max-sixty in #8192
• Add some more mypy checks by @max-sixty in #8193
• Fix sortby link in reshaping.rst by @gtrevisan in #8202
• remove invalid statement from doc/user-guide/io.rst by @kmuehlbauer in #8194
• Move .rolling_exp functions from reduce to apply_ufunc by @max-sixty in #8114
• Add T_DuckArray type hint to Variable.data by @Illviljan in #8203
• Attempt to reproduce #7079 in CI by @jhamman in #7488
• Add comments on when to use which TypeVar by @max-sixty in #8212
• Start a list of modules which require typing by @max-sixty in #8198
• Make documentation of DataArray.where clearer by @Riulinchen in #7955
• Removed .isel for DatasetRolling.construct consistent rolling behavior by @p4perf4ce in #7578
• Skip flaky test by @max-sixty in #8219
• Convert indexes.py to use Self for typing by @max-sixty in #8217
• Use Self rather than concrete types, remove casts by @max-sixty in #8216
• Allow creating DataArrays with nD coordinate variables by @dcherian in #8126
• Remove an import fallback by @max-sixty in #8228
• Add a Literal typing by @max-sixty in #8227
• Add typing to functions related to data_vars by @Illviljan in #8226
• override units for datetime64/timedelta64 variables to preserve integer dtype by @kmuehlbauer in #8201
• test_interpolate_pd_compat with range of fill_value's by @kmuehlbauer in #8189
• Rewrite typed_ops by @headtr1ck in #8204
• adapt to NEP 51 by @keewis in #8064
• decode variable with mismatched coordinate attribute by @kmuehlbauer in #8195
• Release 2023.09.0 by @kmuehlbauer in #8229

New Contributors

• @jerabaul29 made their first contribution in #8083
• @afisc made their first contribution in #8127
• @LocutusOfBorg made their first contribution in #8153
• @kianmeng made their first contribution in #8163
• @dranjan made their first contribution in #8067
• @wkrasnicki made their first contribution in #8174
• @gtrevisan made their first contribution in #8202
• @Riulinchen made their first contribution in #7955
• @p4perf4ce made their first contribution in #7578

Full Changelog: v2023.08.0...v2023.09.0