Version 5.4.0

What's Changed

Enhancements

• Update Vega-Lite from version 5.17.0 to version 5.20.1; see Vega-Lite Release Notes. By @binste in #3479 and #3525
• Remove several dependencies to make the package more lightweight:
  • feat: make pandas and NumPy optional dependencies, don't require PyArrow for plotting with Polars/Modin/cuDF by @MarcoGorelli in #3452
  • Remove toolz dependency by @dangotbanned in #3426
• feat: Improve the syntax for conditions with multiple predicates. See the documentation of alt.when for examples by @dangotbanned in #3427 and #3492
• feat: Reimplement alt.expr as a class that is understood by IDEs by @dangotbanned in #3466
• feat: Support a wider range of iterables, i.e. many places in Altair now accept not only lists but np.array, pd.Series, tuples, etc. by @dangotbanned in #3501
• feat: Adds 4 new carbon themes, provide autocomplete for themes by @dangotbanned in #3516
• perf: Fix issues with Chart|LayerChart.encode, 1.32x speedup to infer_encoding_types by @dangotbanned in #3444

Various typing improvements:

• feat(typing): Adds public altair.typing module by @dangotbanned in #3515
• feat(typing): @deprecated versioning, IDE highlighting by @dangotbanned in #3455
• feat: Adds ChartType type and type guard is_chart_type. Change PurePath to Path type hints by @dangotbanned in #3420
• feat(typing): adds Map alias for Mapping[str, Any] by @dangotbanned in #3458
• feat(typing): Ban typing.Optional import using ruff by @dangotbanned in #3460
• feat(typing): Further simplify generated Literal aliases by @dangotbanned in #3469
• feat(typing): Fully annotate api.py by @dangotbanned in #3508

Bug Fixes

• fix(typing): Resolve mypy==1.11.0 issues in plugin_registry by @dangotbanned in #3487
• fix: solve mypy errors which are due to same object names in core.py and channels.py by @binste in #3414
• fix: remove remapped ruff rule PLR1701 by @dangotbanned in #3453
• fix(docs): @utils.use_signature formatting by @dangotbanned in #3450
• fix(typing): Ignore [arg-type] error in _deduplicate_enum_errors by @dangotbanned in #3475
• fix: Restrict static & runtime top-level imports by @dangotbanned in #3482
• fix: Avoid sphinx error "Code Execution failed:NameError: name 'format_locale' is not defined" by @dangotbanned in #3503
• fix: replace deprecated sphinx default by @dangotbanned in #3512
• fix(ruff): Bump ruff, fix RUF031 by @dangotbanned in #3529

Documentation

• docs: Versioning policy by @dangotbanned in #3488
• docs: Add example of reordering stacked bars by @joelostblom in #3395
• docs: Add example of how to create polar bar charts by @joelostblom in #3428
• docs: Add example of cumulative line chart with facet by @dsmedia in #3440
• docs: Add example with hover path and search box by @dsmedia in #3459
• docs: Add example for Bar Chart with Highlighting on Hover and Selection on Click by @dangotbanned in #3485
• docs: Link to Vega Theme Test in user guide by @dangotbanned in #3528
• docs: Fix and improve alt.Optional doc by @dangotbanned in #3449
• docs: Fix camel case of fillOpacity channel by @timtroendle in #3465
• docs: Fix CONTRIBUTING.md phrasing by @dangotbanned in #3477
• docs: Reduce number of items in header to 4 by @binste in #3401
• docs: Link to project board for roadmap by @joelostblom in #3404
• docs: Use raw strings with escape sequences by @joelostblom in #3411
• docs: Update hatch guidance by @dangotbanned in #3461
• docs: Add empty as a explicit condition kwarg by @dangotbanned in #3490
• docs: Undoc deprecated functionality by @dangotbanned in #3509
• docs: Remove reference to altair_saver in save by @dangotbanned in #3510
• docs: Update link to Altair Ally by @sebp in #3517

Maintenance

• chore: Remove CoC link in templates since it's displayed by default by @joelostblom in #3390
• chore: Update org name from altair-viz to vega by @binste in #3400
• build: pin upperlimit geopandas by @mattijn in #3421
• ci: remove again geopandas pin and disable flaky test by @binste in #3422
• ci: Remove references to archived altair_viewer and altair_saver in ci, docs, and tests. Uninstall anywidget and vl-convert-python during one test run by @binste in #3419
• ci: prepare for numpy 2 by @dangotbanned in #3438
• ci: Add a Dependabot config to auto-update GitHub action versions by @kurtmckee in #3437
• ci: Update dependabot.yaml to include prefix by @mattijn in #3442
• ci: Bump the github-actions group with 2 updates by @dependabot in #3439
• chore: avoid pandas warning for freq='H' in test_utils.py by @MarcoGorelli in #3446
• refactor: Add ruff rules, improve type annotations, improve ci performance by @dangotbanned in #3431
• style: Remove outdated comments about the use of the former _Parameter protocol by @binste in #3448
• chore: fixup ruff-mypy CI job due to Ruff change by @MarcoGorelli in #3463
• refactor(typing): Reuse generated Literal aliases in api by @dangotbanned in #3464
• ci: remove toolz from [[tool.mypy.overrides]] by @dangotbanned in #3474
• refactor: Simplify SchemaBase repr by @dangotbanned in #3472
• refactor: remove dead _get_channels_mapping code by @dangotbanned in #3467
• ci: bump ruff>=0.5.3 for PLW1514 fix by @dangotbanned in #3484
• test: skip ibis test on unsupported python version by @dangotbanned in #3486
• refactor(typing): reduce type ignores in api.py by @dangotbanned in #3480
• fix: remove unsupported sphinx theme option 'footer_items' by @dangotbanned in #3489
• refactor: Rename and move is_undefined, OneOrSeq by @dangotbanned in #3491
• refactor(docs, ruff): Add pydocstyle rules by @dangotbanned in #3493
• ci: include optional dependencies for Polars backend in ibis-framework install by @MarcoGorelli in #3494
• ci: Add python-version=="3.9" to github action by @dangotbanned in #3498
• ci(ruff): Remove stale docstring-code-format comment by @dangotbanned in #3496
• ci: relax numpy<=2.0.0 constraint by @dangotbanned in #3504
• refactor: replace archived m2r with updated mistune by @dangotbanned in #3506
• build: Add ipykernel optional dependency to dev group by @dangotbanned in #3507
• refactor(ruff): Organize imports w/ (I001, TID252) rules by @dangotbanned in #3513
• ci: Bump sphinx, vl-convert-python by @dangotbanned in #3527
• chore: Remove filterwarnings from tests for cross-version pandas compatibility by @MarcoGorelli in #3522
• ci(ruff): Enforce the default C901 complexity by @dangotbanned in #3531
• refactor: Simplify unreachable compound chart cases by @dangotbanned in #3520
• feat: Adds vega-themes.json using vl_convert by @dangotbanned in #3523

New Contributors

• @dangotbanned made their first contribution in #3420
• @kurtmckee made their first contribution in #3437
• @dependabot made their first contribution in #3439
• @dsmedia made their first contribution in #3440
• @MarcoGorelli made their first contribution in #3446
• @timtroendle made their first contribution in #3465
• @sebp made their first contribution in #3517

Full Changelog: v5.3.0...v5.4.0