问使用python获取激光雷达数据？

本人python纯小白，运行一下程序时出现错误，使用的rplidar a1m8

import numpy as np

import matplotlib.pyplot as plt

from rplidar import RPLidar

def get_data():

lidar = RPLidar('COM3', baudrate=115200)

for scan in lidar.iter_scans(max_buf_meas=500):

break

lidar.stop()

return scan

for i in range(1000000):

if(i%7==0):

x = np.radians([])

y = []

print(i)

current_data=get_data()

for point in current_data:

if point[0]==15:

x.append(point[2]*np.sin(point[1]))

y.append(point[2]*np.cos(point[1]))

plt.clf()

plt.scatter(x, y)

plt.pause(.1)

plt.show()