Python3.6 AttributeError: module 'asyncio' has no attribute 'run'

问题

I tried to read https://hackernoon.com/asynchronous-python-45df84b82434. It's about asynchronous python and I tried the code from this, but I'm getting a weird Error. The code is: `

import asyncio
import aiohttp

urls = ['http://www.google.com', 'http://www.yandex.ru', 'http://www.python.org']

async def call_url(url):
    print('Starting {}'.format(url))
    response = await aiohttp.ClientSession().get(url)
    data = await response.text()
    print('{}: {} bytes: {}'.format(url, len(data), data))
    return data

futures = [call_url(url) for url in urls]

asyncio.run(asyncio.wait(futures))

When I try to run it says:

Traceback (most recent call last):
  File "test.py", line 15, in <module>
    asyncio.run(asyncio.wait(futures))
AttributeError: module 'asyncio' has no attribute 'run'
sys:1: RuntimeWarning: coroutine 'call_url' was never awaited

I dont have any files named ayncio and I have proof:

>>> asyncio
<module 'asyncio' from '/usr/lib/python3.6/asyncio/__init__.py'>

回答1:

asyncio.run is a Python 3.7 addition. In 3.5-3.6, your example is roughly equivalent to:

import asyncio

futures = [...]
loop = asyncio.get_event_loop()
loop.run_until_complete(asyncio.wait(futures))

回答2:

The asyncio.run() function was added in Python 3.7. From the asyncio.run() function documentation:

New in version 3.7: Important: this function has been added to asyncio in Python 3.7 on a provisional basis.

Note the provisional part; the Python maintainers forsee that the function may need further tweaking and updating, so the API may change in future Python versions.

At any rate, you can't use it on Python 3.6. You'll have to upgrade or implement your own.

A very simple approximation would be to use loop.run_until_complete():

loop = asyncio.get_event_loop()
result = loop.run_until_complete(coro)

although this ignores handling remaining tasks that may still be running. See the asyncio.runners source code for the complete asyncio.run() implementation.

来源：https://stackoverflow.com/questions/52796630/python3-6-attributeerror-module-asyncio-has-no-attribute-run

标签

python

python-3.6

python-asyncio