Sample usage of aiohttp to post arbitary data and return / use the result in original order with asyncio.gather()

aiohttp_sample

import asyncio
import aiohttp
import json

async def retrieve_data(postdata):
    async with aiohttp.ClientSession() as client:
        #use the excellent httpbin.org as a springboard 
        postrep = await client.post('http://httpbin.org/post',data={"postkey":postdata})
        jsonobj = json.loads(await postrep.text())
        return jsonobj['form']['postkey']

def main():
    puntlist = [x for x in range(11)] #  arbitrary range
    loop = asyncio.get_event_loop()
    tasks = [retrieve_data(x) for x in puntlist] #build a list of tasks
    returned = loop.run_until_complete(asyncio.gather(*tasks)) #shunt them through the loop
    for i in returned:
        print(i)

if __name__=='__main__':
    main()