aiohttp¶

import lxml.html as lhtml

import aiohttp
import asyncio


URLS = {
    'imgurl': 'http://imgur.com/',
    'flickr': 'https://www.flickr.com/photos/tags/pretty'
}

HEADERS = {
    'User-Agent':
    "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:40.0) Gecko/20100101 Firefox/41.2"
}


def get_images(html):
    doc = lhtml.document_fromstring(html)
    return doc.cssselect('img')


async def print_img_src(name, url):
    async with aiohttp.request('GET', url, headers=HEADERS) as response:
        if response.status == 200:
            images = get_images(await response.read())
            for img in images:
                if 'src' in img.attrib:
                    print(img.attrib['src'])

tasks = [print_img_src(name, url)
         for name, url in URLS.items()]

loop = asyncio.get_event_loop()
loop.run_until_complete(asyncio.wait(tasks))
loop.close()