#! /usr/bin/env python3.5
import asyncio

async def main():
    lock = asyncio.Lock()

    async with lock:
        try:
            await asyncio.wait_for(lock.acquire(), timeout=1.0)
        except asyncio.TimeoutError:
            pass

    print("DEADLOCK HERE")
    print("_locked: ", lock._locked)
    print("_waiters:", lock._waiters)
    async with lock:
        pass

loop = asyncio.get_event_loop()
loop.run_until_complete(main())