Matplotlib动画:如何删除之前绘制的点？

import matplotlib.pyplot as plt
import matplotlib.animation as animation

fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)

def update(frame):
    # 在这里进行绘图操作，例如清空之前的点
    ax.clear()
    # 绘制新的点
    ax.scatter(x_data, y_data)

ani = animation.FuncAnimation(fig, update, frames=range(num_frames), interval=100)

plt.show()