matplotlib.pyplot.set_cmap(cmap) [source]
Set the default colormap. Applies to the current image if any. See help(colormaps) for more information.
cmap must be a Colormap instance, or the name of a registered colormap.
See matplotlib.cm.register_cmap() and matplotlib.cm.get_cmap().
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https://matplotlib.org/3.1.1/api/_as_gen/matplotlib.pyplot.set_cmap.html