Don't really want to use Python asyncio but have to? Here's one way.

async_example.py

import asyncio


async def in_the_future(fut):
    result = await fut    
    print("Side-effect: %s" % result)
    return result


async def side_effects(url, name):
    await asyncio.sleep(1)
    msg = "Saving %s.png for %s" % (url, name)
    return msg


def job(url, name):
    task = asyncio.ensure_future(side_effects(url, name))
    task = in_the_future(task)
    asyncio.run_coroutine_threadsafe(task, loop)


# Abandon all hope ye who codes synchronously here. 
loop = asyncio.get_event_loop()
shots = {
            'one'  : 'http://foo',
            'two'  : 'http://bar',
            'three': 'http://spam',
            'four' : 'http://eggs'
        }
for shot in shots:
    job(shot, shots[shot])