用于Google Fit REST心率查询的数据源ID是什么？

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

# 假设您已经有了有效的访问令牌
creds = Credentials.from_authorized_user_info(info={'access_token': 'YOUR_ACCESS_TOKEN'})

# 构建Google Fit API客户端
fit_service = build('fitness', 'v1', credentials=creds)

# 获取数据源列表
data_sources_request = fit_service.users().dataSources().list(userId='me')
data_sources_response = data_sources_request.execute()

# 查找心率数据源ID
heart_rate_data_source_id = None
for data_source in data_sources_response.get('dataSource', []):
    if 'heart_rate' in data_source.get('dataStreamName', '').lower():
        heart_rate_data_source_id = data_source['dataStreamId']
        break

print(f"Heart Rate Data Source ID: {heart_rate_data_source_id}")