asyncio 模块

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import asyncio     async def hello():     print('Hello start!')     await asyncio.sleep(2)     print('Hello end!')     async def hello222():     print('Hello222 start!')     result = await somework()     print('Hello222 end', result)     async def somework():     print('somework start...')     await asyncio.sleep(3)     print("somework     end ")     return ("sleep 3 s")     loop = asyncio.get_event_loop() tasks = [hello(), hello222()] loop.run_until_complete(asyncio.wait(tasks)) loop.close()