如何让Lambda函数等待异步操作完成？

import requests

def lambda_handler(event, context, callback):
    # 异步操作
    response = requests.get('https://example.com/api')

    # 异步操作完成后调用回调函数
    callback(None, response.json())

import asyncio
import requests

async def async_operation():
    # 异步操作
    response = await requests.get('https://example.com/api')

    return response.json()

def lambda_handler(event, context):
    # 创建事件循环
    loop = asyncio.get_event_loop()

    # 等待异步操作完成
    response = loop.run_until_complete(async_operation())

    return response