如何从同步代码Python调用异步函数

import asyncio

async def async_function():
    # 异步函数的实现

def sync_function():
    loop = asyncio.get_event_loop()
    future = asyncio.ensure_future(async_function())
    result = loop.run_until_complete(future)
    return result

import aiohttp
import asyncio

async def async_function():
    # 异步函数的实现

def sync_function():
    loop = asyncio.get_event_loop()
    session = aiohttp.ClientSession(loop=loop)
    response = loop.run_until_complete(session.get('http://example.com'))
    result = loop.run_until_complete(response.text())
    session.close()
    return result

import trio

async def async_function():
    # 异步函数的实现

def sync_function():
    result = trio.run(async_function)
    return result