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Altair v4.1.0 Release Notes

• • Minimum Python version is now 3.6
  • 🚀 Update Vega-Lite to version 4.8.1; many new features and bug fixes from Vega-Lite versions 4.1 through 4.8; see Vega-Lite Release Notes.

  ✨ Enhancements

  • strokeDash encoding can now be used to control line styles (Example: Multi Series Line Chart
  • 💾 chart.save() now relies on altair_saver for more flexibility (#1943).
  • New chart.show() method replaces chart.serve(), and relies on altair_viewer to allow offline viewing of charts (#1988).

  🐛 Bug Fixes

  • 👌 Support Python 3.8 (#1958)
  • 👌 Support multiple views in JupyterLab (#1986)
  • 👌 Support numpy types within specifications (#1914)
  • 👌 Support pandas nullable ints and string types (#1924)

  🚧 ##Maintenance

  • Altair now uses black and flake8 for maintaining code quality & consistency.

Previous changes from v4.0.0

• 🚀 Altair Version 4.0.0 release

  🔖 Version 4.0.0 is based on Vega-Lite version 4.0, which you can read about at
  🚀 https://github.com/vega/vega-lite/releases/tag/v4.0.0.

  ✅ It is the first version of Altair to drop Python 2 compatibility, and is tested
  on Python 3.5 and newer.

  ✨ Enhancements

  👌 Support for interactive legends: (Example)
  

  📱 Responsive chart width and height: (Example)
  

  📱 Bins responsive to selections: (Example)
  📱

  🆕 New pivot transform: (Example)
  

  🆕 New Regression transform: (Example)
  

  🆕 New LOESS transform: (Example)
  

  🆕 New density transform: (Example)
  

  Image mark (Example)
  

  🆕 New default html renderer, directly compatible with Jupyter Notebook and
  JupyterLab without the need for frontend extensions, as well as tools like
  nbviewer and nbconvert, and related notebook environments such as Zeppelin,
  0️⃣ Colab, Kaggle Kernels, and DataBricks. To enable the old default renderer, use:

  alt.renderers.enable('mimetype')
  

  👌 Support per-corner radius for bar marks: (Example)
  

  Grammar Changes

  Sort-by-field can now use the encoding name directly. So instead of

  alt.Y('y:Q', sort=alt.EncodingSortField('x_field', order='descending'))
  

  you can now use::

  alt.Y('y:Q', sort="-x")
  

  🔧 The rangeStep argument to :class:Scale and :meth:Chart.configure_scale is deprecated.
  instead, use chart.properties(width={"step": rangeStep}) or
  🔧 chart.configure_view(step=rangeStep).

  align, center, spacing, and columns are no longer valid chart properties, but
  🚚 are moved to the encoding classes to which they refer.

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• Previous v4.0.1