8000 Document that get_cmap returns a copy now · matplotlib/matplotlib@2a1da87 · GitHub
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Document that get_cmap returns a copy now
This was put into effect in #22298, but was not given an API note.
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‎doc/api/next_api_changes/behavior/23710-ES.rst

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``plt.get_cmap`` and ``matplotlib.cm.get_cmap`` return a copy
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Formerly, `~.pyplot.get_cmap` and `.cm.get_cmap` returned a global version of a
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`.Colormap`. This was prone to errors as modification of the colormap would
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propagate from one location to another without warning. Now, a new copy of the
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colormap is returned.

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