async def ticker (delay, to):
    """产生0到to的数字每delay 秒。"""
    for i in range(to):
        yield i
        await asyncio.sleep(delay)
async def printNum():
    async for i in ticker(1, 5):
        print(i)

import asyncio
loopPrint = asyncio.get_event_loop()
try:
    loopPrint.run_until_complete(printNum())
except:
    pass
异步生成