Version 3.0.2
matplotlib
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matplotlib.axes.subplot_class_factory

axes.subplot_class_factory

This makes a new class that inherits from SubplotBase and the given axes_class (which is assumed to be a subclass of axes.Axes). This is perhaps a little bit roundabout to make a new class on the fly like this, but it means that a new Subplot class does not have to be created for every type of Axes.