scratch.py

import asyncio


@asyncio.coroutine
def foo1():
    while True:
        print("foo1 running")
        yield from asyncio.sleep(3)


@asyncio.coroutine
def foo2():
    asyncio.ensure_future(foo1())
    raise Exception("exception in foo2")


@asyncio.coroutine
def foo():
    asyncio.ensure_future(foo2())
    while True:
        print("foo still running")
        yield from asyncio.sleep(3)


asyncio.get_event_loop().run_until_complete(foo())