import asyncio

class MyException(BaseException):
    pass

@asyncio.coroutine
def raise_myexception():
    raise MyException()

loop = asyncio.get_event_loop()
task = loop.create_task(raise_myexception())
loop.stop()
try:
    loop.run_forever()
except MyException:
    pass
task.exception()

print(loop._ready)
loop.run_forever()
loop.close()