如何在matplotlib中每次单击鼠标时绘制一个点

import matplotlib.pyplot as plt

fig, ax = plt.subplots()

points = []

def onclick(event):
    if event.button == 1:  # 判断是否是鼠标左键单击事件
        x = event.xdata
        y = event.ydata
        points.append((x, y))  # 将点坐标添加到列表中
        ax.plot(x, y, 'ro')  # 绘制红色的点
        plt.draw()  # 更新图形

cid = fig.canvas.mpl_connect('button_press_event', onclick)  # 绑定鼠标单击事件

plt.show()

import matplotlib.pyplot as plt

fig, ax = plt.subplots()
points = []

def onclick(event):
    if event.button == 1:
        x = event.xdata
        y = event.ydata
        points.append((x, y))
        ax.plot(x, y, 'ro')
        plt.draw()

cid = fig.canvas.mpl_connect('button_press_event', onclick)

plt.show()