python 从3.5开始从语言层面提供了新的异步编程语法。
代码语言：javascript复制import asyncio
async def hello():
print("hello the world")
r = await asyncio.sleep(1)
print("hello again")
def main():
loop = asyncio.get_event_loop()
"""
tasks = [
asyncio.ensure_future(hello()),
]
loop.run_until_complete(asyncio.wait(tasks))
"""
print("begin")
loop.run_until_complete(hello())
print("end")
loop.close()
print("program is finished.")
if __name__ == "__main__":
main()
