I'm trying to asyncio.create_task() but I dealing with this error:

Here's an example:

import asyncio
import time

async def async_say(delay, msg):
 await asyncio.sleep(delay)
 print(msg)

async def main():
 task1 = asyncio.create_task(async_say(4, 'hello'))
 task2 = asyncio.create_task(async_say(6, 'world'))

 print(f"started at time.strftime('%X')")
 await task1
 await task2
 print(f"finished at time.strftime('%X')")

loop = asyncio.get_event_loop()
loop.run_until_complete(main())

Out:

AttributeError: module 'asyncio' has no attribute 'create_task'

So I tried with the following snippet code (.ensure_future()) instead, without any problem:

async def main():
 task1 = asyncio.ensure_future(async_say(4, 'hello'))
 task2 = asyncio.ensure_future(async_say(6, 'world'))

 print(f"started at time.strftime('%X')")
 await task1
 await task2
 print(f"finished at time.strftime('%X')")

loop = asyncio.get_event_loop()
loop.run_until_complete(main())

Out:

started at 13:19:44
hello
world
finished at 13:19:50

[UPDATE]:

With borrowing from @user4815162342 answer, I updated my question:

async def main():
 loop = asyncio.get_event_loop()
 task1 = loop.create_task(async_say(4, 'hello'))
 task2 = loop.create_task(async_say(6, 'world'))

 print(f"started at time.strftime('%X')")
 await task1
 await task2
 print(f"finished at time.strftime('%X')")

loop = asyncio.get_event_loop()
loop.run_until_complete(main())

What's wrong?

[NOTE]:

• Python 3.6


• Ubuntu 16.04

The create_task top-level function was added in Python 3.7, and you are using Python 3.6. Prior to 3.7, create_task was only available as a method on the event loop, so you can invoke it like that:

async def main():
 loop = asyncio.get_event_loop()
 task1 = loop.create_task(async_say(4, 'hello'))
 task2 = loop.create_task(async_say(6, 'world'))

That works in both 3.6 and 3.7, as well as in earlier versions. asyncio.ensure_future will work as well, but when you know you're dealing with a coroutine, create_task is more explicit and is the preferred option.