如何使用python从谷歌课堂获取谷歌会议链接？

from google_auth_oauthlib.flow import InstalledAppFlow

# 定义授权范围
SCOPES = ['https://www.googleapis.com/auth/classroom.courses.readonly', 'https://www.googleapis.com/auth/classroom.rosters.readonly']

# 定义客户端ID和客户端密钥
CLIENT_ID = 'YOUR_CLIENT_ID'
CLIENT_SECRET = 'YOUR_CLIENT_SECRET'

# 创建授权流
flow = InstalledAppFlow.from_client_secrets_file(
    'credentials.json',  # 下载的客户端凭据文件路径
    scopes=SCOPES)

# 获取授权访问令牌
credentials = flow.run_local_server(port=0)

# 保存访问令牌
token = credentials.to_json()
with open('token.json', 'w') as token_file:
    token_file.write(token)

import json
from google.oauth2.credentials import Credentials
from googleapiclient.discovery import build

# 加载访问令牌
with open('token.json', 'r') as token_file:
    token = token_file.read()
credentials = Credentials.from_json(token)

# 创建谷歌课堂API客户端
service = build('classroom', 'v1', credentials=credentials)

# 获取谷歌课堂的课程列表
courses = service.courses().list().execute()

# 遍历课程列表，获取谷歌会议链接
for course in courses['courses']:
    if 'courseState' in course and course['courseState'] == 'ACTIVE':
        if 'alternateLink' in course and 'guardiansEnabled' in course and not course['guardiansEnabled']:
            print('课程名称：', course['name'])
            print('谷歌会议链接：', course['alternateLink'])