matplotlib.axes.Axes.get_legend_handles_labels

Axes.get_legend_handles_labels(legend_handler_map=None) [source]

Return handles and labels for legend

ax.legend() is equivalent to

h, 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