我们的自动化部署平台升级到django2+python3了，

并发方面的知识点，也跟进一下啦。

http://python.jobbole.com/87310/

这篇讲得挺入门的~~

实操一下。

import timeimport asyncioimport functoolsnow = lambda : time.time()async def do_some_work(x):    print('Waiting: ', x)    await asyncio.sleep(x)    return 'Done after {}s'.format(x)def callback(t, future):    print('Callback: ', t, future.result())start = now()coroutine1 = do_some_work(1)coroutine2 = do_some_work(2)coroutine4 = do_some_work(4)tasks = [    asyncio.ensure_future(coroutine1),    asyncio.ensure_future(coroutine2),    asyncio.ensure_future(coroutine4),    ]loop =asyncio.get_event_loop()for task in tasks:    task.add_done_callback(functools.partial(callback, 2))loop.run_until_complete(asyncio.wait(tasks))for task in tasks:    task.add_done_callback(functools.partial(callback, 2))    print('Task return: {}'.format(task.result()))print('TIME: ', now() - start)