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DOC: api note
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‎doc/api/next_api_changes/2019-01-27-JMK.rst

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`matplotlib.colorbar.ColorbarBase` is no longer a subclass of `.ScalarMappable`
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-------------------------------------------------------------------------------
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This inheritance lead to a confusing situation where the
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`ScalarMappable` passed to `matplotlib.colorbar.Colorbar` (`~.Figure.colorbar`)
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had a ``set_norm`` method, as did the colorbar. The colorbar is now purely a
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slave to the `ScalarMappable` norm and colormap, and the old inherited methods
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`~matplotlib.colorbar.ColorbarBase.set_norm`,
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`~matplotlib.colorbar.ColorbarBase.set_cmap`,
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`~matplotlib.colorbar.ColorbarBase.set_clim` are deprecated, as are the
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getter versions of those calls. To set the norm associated with a colorbar do
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``colorbar.mappable.set_norm()`` etc.

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