matplotlib.axes.Axes.get_legend_handles_labels
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Axes.get_legend_handles_labels(legend_handler_map=None)[source] -
Return handles and labels for legend
ax.legend()is equivalent toh, l = ax.get_legend_handles_labels() ax.legend(h, l)
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https://matplotlib.org/3.0.0/api/_as_gen/matplotlib.axes.Axes.get_legend_handles_labels.html