Aiohttp: AttributeError: module 'asyncio' has no attribute 'current_task'

[focalism]

Long story short

Get mistake when I use aiohttp make a get request with aiohttp==3.0.9 but not with 3.0.5

Expected behaviour

Return the content of page

Actual behaviour

Traceback (most recent call last):
  File "test.py", line 13, in <module>
    loop.run_until_complete(hello("http://httpbin.org/headers"))
  File "/usr/local/python3/lib/python3.7/asyncio/base_events.py", line 466, in run_until_complete
    return future.result()
  File "test.py", line 7, in hello
    async with session.get(url) as response:
  File "/usr/local/python3/lib/python3.7/site-packages/aiohttp/client.py", line 782, in __aenter__
    self._resp = await self._coro
  File "/usr/local/python3/lib/python3.7/site-packages/aiohttp/client.py", line 271, in _request
    with timer:
  File "/usr/local/python3/lib/python3.7/site-packages/aiohttp/helpers.py", line 643, in __enter__
    task = current_task(loop=self._loop)
  File "/usr/local/python3/lib/python3.7/site-packages/aiohttp/helpers.py", line 188, in current_task
    task = asyncio.current_task(loop=loop)
AttributeError: module 'asyncio' has no attribute 'current_task'

Steps to reproduce

import asyncio
from aiohttp import ClientSession

async def hello(url):
    async with ClientSession() as session:
        async with session.get(url) as response:
            response = await response.read()
            print(response)

loop = asyncio.get_event_loop()

loop.run_until_complete(hello("http://httpbin.org/headers"))

Your environment

Python:3.7.0a1
aiohttp:3.0.9
OS:CentOS7

[asvetlov]

It works:

Python 3.7.0b2+ (heads/3.7:6e65e44626, Mar 16 2018, 11:07:20) 
[GCC 7.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import asyncio
>>> asyncio.current_task
<function current_task at 0x7ffbd95681c8>

The function is here: https://github.com/python/cpython/blob/3.7/Lib/asyncio/tasks.py#L27-L31

I don't remember when I've added the function and what is first Python version supported this.
3.7.0 beta definitely have it, please upgrade your Python.

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