import numpy as npimport matplotlib.pyplot as pltfig = plt.figure()ax = fig.add_subplot(111)ax.set_title('click on points')line, = ax.plot(np.random.rand(10), picker=5, drawstyle="steps-pre")  # 5 points tolerancedef onpick(event):    thisline = event.artist    xdata = thisline.get_xdata()    ydata = thisline.get_ydata()    ind = event.ind    points = tuple(zip(xdata[ind], ydata[ind]))    print('onpick points:', points)fig.canvas.mpl_connect('pick_event', onpick)plt.show()