Commita16bd83

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flags_await: start refactoring

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	`1`	`+"""Download flags of top 20 countries by population`
	`2`	`+`
	`3`	`+asyncio + aiottp version`
	`4`	`+`
	`5`	`+Sample run::`
	`6`	`+`
	`7`	`+ $ python3 flags_asyncio.py`
	`8`	`+ EG VN IN TR RU ID US DE CN MX JP BD NG ET FR BR PH PK CD IR`
	`9`	`+ 20 flags downloaded in 1.07s`
	`10`	`+`
	`11`	`+"""`
	`12`	`+# BEGIN FLAGS_ASYNCIO`
	`13`	`+importasyncio`
	`14`	`+`
	`15`	`+importaiohttp# <1>`
	`16`	`+`
	`17`	`+fromflagsimportBASE_URL,save_flag,show,main# <2>`
	`18`	`+`
	`19`	`+`
	`20`	`+@asyncio.coroutine# <3>`
	`21`	`+defget_flag(cc):`
	`22`	`+url='{}/{cc}/{cc}.gif'.format(BASE_URL,cc=cc.lower())`
	`23`	`+resp=yieldfromaiohttp.request('GET',url)# <4>`
	`24`	`+image=yieldfromresp.read()# <5>`
	`25`	`+returnimage`
	`26`	`+`
	`27`	`+`
	`28`	`+@asyncio.coroutine`
	`29`	`+defdownload_one(cc):# <6>`
	`30`	`+image=yieldfromget_flag(cc)# <7>`
	`31`	`+show(cc)`
	`32`	`+save_flag(image,cc.lower()+'.gif')`
	`33`	`+returncc`
	`34`	`+`
	`35`	`+`
	`36`	`+defdownload_many(cc_list):`
	`37`	`+loop=asyncio.get_event_loop()# <8>`
	`38`	`+to_do= [download_one(cc)forccinsorted(cc_list)]# <9>`
	`39`	`+wait_coro=asyncio.wait(to_do)# <10>`
	`40`	`+res,_=loop.run_until_complete(wait_coro)# <11>`
	`41`	`+loop.close()# <12>`
	`42`	`+`
	`43`	`+returnlen(res)`
	`44`	`+`
	`45`	`+`
	`46`	`+if__name__=='__main__':`
	`47`	`+main(download_many)`
	`48`	`+# END FLAGS_ASYNCIO`

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