python - 运行时警告 : coroutine 'main' was never awaited

Question

我正在尝试解析和放置 JSON 异步但得到:

RuntimeWarning: coroutine 'main' was never awaited

import asyncio
import aiohttp

async def get_put_content(url_get, url_put, session):
    async with session.get(url_get) as response:
        data = await response.read()

    async with session.put(url_put, data=data) as response:
        print(response.status)     

async def main():
    async with aiohttp.ClientSession() as session:
        for temp_id in range (1, 100):
            api_url = "https://api.link" + str(temp_id)
            bd_url = "http://127.0.0.1:5984/photosget/" + str(temp_id)
            asyncio.create_task(get_put_content(api_url, bd_url, session))

        asyncio.wait(get_put_content)

if __name__ == '__main__':
    main()

我如何正确使用异步？

Answer 1

如错误消息中所述，您必须等待主函数，因为它是异步的。借用the Python3.7 documentation section about coroutines

Note that simply calling a coroutine will not schedule it to be executed

鉴于您想运行顶级入口点，在 Python 3.7+ 中，您应该使用

if __name__ == "__main__":
    asyncio.run(main())

对于早期版本，您必须自己处理事件循环:

if __name__ == "__main__":
    loop = asyncio.get_event_loop()
    loop.run_until_complete(main())