import threading
import asyncio
#在同一个线程里并行执行  异步IO
@asyncio.coroutine
def hello():
    print('Hello world! (%s)' % threading.currentThread())
    yield from asyncio.sleep(5)
    print('Hello again! (%s)' % threading.currentThread())
@asyncio.coroutine
def hi():
    print('Hi! (%s)' % threading.currentThread())
    yield from asyncio.sleep(6)
    print('Hi! (%s)' % threading.currentThread())

loop = asyncio.get_event_loop()
tasks = [hello(), hi()]
loop.run_until_complete(asyncio.wait(tasks))
print('end')
loop.close()

运行结果：

Hello world! (<_MainThread(MainThread, started 139753048471296)>)
Hi! (<_MainThread(MainThread, started 139753048471296)>)
（会等5秒）
Hello again! (<_MainThread(MainThread, started 139753048471296)>)
（会等1秒）
Hi! (<_MainThread(MainThread, started 139753048471296)>)
end