Get response status code using asyncio/aiohttp

async_get_status_code.py

import sys
import time
import asyncio
import itertools

import aiohttp


async def spin(msg):  # <2>
    write, flush = sys.stdout.write, sys.stdout.flush
    for char in itertools.cycle('|/-\\'):
        status = char + ' ' + msg
        write(status)
        flush()
        write('\x08' * len(status))
        try:
            await asyncio.sleep(.1)
        except asyncio.CancelledError:
            break
    write(' ' * len(status) + '\x08' * len(status))


async def get_status(url, session):
    async with session.get(url) as response:
        return url, response.status


async def run(urls, loop):
    tasks = []
    spinner = asyncio.ensure_future(spin('waiting'))
    async with aiohttp.ClientSession(loop=loop) as session:
        for url in urls:
            task = asyncio.ensure_future(get_status(url, session))
            tasks.append(task)
        responses = await asyncio.gather(*tasks)
    spinner.cancel()
    return responses


if __name__ == '__main__':
    urls = [ 'http://pudelek.pl/', 'http://relarn.ru',
             'http://msu.ru', 'http://россия.рф', 'http://msu.ru', 'https://pagesjaunes.fr', 'http://edu-it.ru', 'http://infojournal.ru', 
             'http://onyx.ru', 'http://prosv.ru', 'http://titul.ru', 
             'http://lequipe.fr', 'http://1und1.de', 
             'http://chomikuj.pl', ]
    s = time.time()
    loop = asyncio.get_event_loop()
    res = loop.run_until_complete(run(urls, loop))
    for i, j in res:
        print(i, j)
    t = time.time() - s
    print(t)
    loop.close()

Why do you need to wrap the get_status call in an ensure_future? Seems redundant to the gather you are doing later, no?