Since Python 3.5 will not support awaiting for concurrent.futures.Futures natively, one has to use the asyncio.futures.wrap_future() function in coroutines like this:

async def foo():
    await wrap_future(executor.submit(...))

The wrap_future() function is, however, not mentioned in the asyncio documentation. It should be, in order for the standard library to provide the above crutch until proper support arrives in 3.6.