我想启用选择器事件（单击点并打印其坐标），但是要在具有次要y轴的绘图上。
例如，从twinx example开始采用。选择器事件以某种方式仅在第二轴（正弦线）上启用：
import numpy as np
import matplotlib.pyplot as plt
fig, ax1 = plt.subplots()
t = np.arange(0.01, 10.0, 0.01)
s1 = np.exp(t)
ax1.plot(t, s1, 'b.',picker=5)
ax1.set_xlabel('time (s)')
# Make the y-axis label, ticks and tick labels match the line color.
ax1.set_ylabel('exp', color='b')
ax1.tick_params('y', colors='b')
ax2 = ax1.twinx()
s2 = np.sin(2 * np.pi * t)
ax2.plot(t, s2, 'r.',picker=5)
ax2.set_ylabel('sin', color='r')
ax2.tick_params('y', colors='r')
def onpick1(event):
thisline = event.artist
xdata = thisline.get_xdata()
ydata = thisline.get_ydata()
ind = event.ind
print('Point: ', zip(np.take(xdata, ind), np.take(ydata, ind)))
fig.canvas.mpl_connect('pick_event', onpick1)
fig.tight_layout()
plt.show()