Matplotlib legend locations. Source: https://stackoverflow.com/a/43439132

matplotlib-legend-locations.py

# Outside top right
l1 = plt.legend(bbox_to_anchor=(1.04,1), borderaxespad=0)
# Outside bottom right
l2 = plt.legend(bbox_to_anchor=(1.04,0), loc="lower left", borderaxespad=0)
# Outside center right
l3 = plt.legend(bbox_to_anchor=(1.04,0.5), loc="center left", borderaxespad=0)
# Outside top single row
l4 = plt.legend(bbox_to_anchor=(0,1.02,1,0.2), loc="lower left",
                mode="expand", borderaxespad=0, ncol=3)
# Outside bottom right
l5 = plt.legend(bbox_to_anchor=(1,0), loc="lower right", 
                bbox_transform=fig.transFigure, ncol=3)
# Inside center left
l6 = plt.legend(bbox_to_anchor=(0.4,0.8), loc="upper right")