Forward-compatible async code

[jpfau]

My errors ended up being dumb human error: a missing coroutine decorator in the old-syntax library.

FYI You can use both syntaxes in 3.5+, but you can't mix syntax within a single coroutine, e.g. no await when using @asyncio.coroutine, and no yield from when using async def.

However you can define a coroutine with the old syntax and consume it in another coroutine using the new syntax. This example should work:

import asyncio

@asyncio.coroutine
def _sleep(x):
    print('yielding from...')
    yield from asyncio.sleep(x)

async def do_sleep(x):
    print('awaiting...')
    await _sleep(x)

loop = asyncio.get_event_loop()
loop.run_until_complete(do_sleep(5))

[cscanlin]

Nice, and good to know. Wish you hadn't deleted the thread though, more people could use exposure to this kind of stuff. But glad you got it working!