display only one legend in python code example

Example 1: subplot matplotlib legend

ax1.legend("HHZ 1",loc="upper right")
ax2.legend("HHN",loc="upper right")
ax3.legend("HHE",loc="upper right")

Example 2: python no label in legend matplot

ax.plot(randn(1000).cumsum(), 'k.', label='_nolegend_')