https://www.v2ex.com/t/313382#reply11

dl.py

import urllib.request
import asyncio
import json

r = urllib.request.urlopen('https://raw.githubusercontent.com/spacelan/wechat-emoticon/master/emoticons.json').read().decode('utf8')
json_obj = json.loads(r)

@asyncio.coroutine
def download(todo):
  urllib.request.urlretrieve(todo.get('url'), todo.get('md5') + '.gif')

loop = asyncio.get_event_loop()
tasks = [download(todo) for todo in json_obj]
loop.run_until_complete(asyncio.wait(tasks))
loop.close()