python中matplotlib实现随鼠标滑动自动标注的方法

import matplotlib.pyplot as plt
import numpy as np
	
def Show(y):
	#参数为一个list
	
	len_y = len(y)
	x = range(len_y)
	_y = [y[-1]]*len_y
	
	fig = plt.figure(figsize=(960/72,360/72))
	ax1 = fig.add_subplot(1,1,1)
	
	ax1.plot(x, y, color='blue')
	line_x = ax1.plot(x, _y, color='skyblue')[0]
	line_y = ax1.axvline(x=len_y-1, color='skyblue')
	
	ax1.set_title('aaa')
	#标签
	text0 = plt.text(len_y-1,y[-1],str(y[-1]),fontsize = 10)
	
	def scroll(event):
		axtemp=event.inaxes
		x_min, x_max = axtemp.get_xlim()
		fanwei_x = (x_max - x_min) / 10
		if event.button == 'up':
			axtemp.set(xlim=(x_min + fanwei_x, x_max - fanwei_x))
		elif event.button == 'down':
			axtemp.set(xlim=(x_min - fanwei_x, x_max + fanwei_x))
		fig.canvas.draw_idle() 
	#这个函数实时更新图片的显示内容
	def motion(event):
		try:
			temp = y[int(np.round(event.xdata))]
			for i in range(len_y):
				_y[i] = temp
			line_x.set_ydata(_y)
			line_y.set_xdata(event.xdata)
			######
			text0.set_position((event.xdata, temp))
			text0.set_text(str(temp))
			
			fig.canvas.draw_idle() # 绘图动作实时反映在图像上
		except:
			pass

	fig.canvas.mpl_connect('scroll_event', scroll)
	fig.canvas.mpl_connect('motion_notify_event', motion)
	
	plt.show()