import asyncio
import sys

class MyObject:
    def __del__(self):
        print("DELETE OBJECT")

@asyncio.coroutine
def func(fut):
    obj = MyObject()
    try:
        raise ValueError()
    except Exception as err:
        fut.set_exception(err)

fut = asyncio.Future()
asyncio.Task(func(fut))
asyncio.get_event_loop().run_forever()