task取消
1 import asyncio 2 import time 3 4 5 async def get_html(sleep_time): 6 print('waiting') 7 await asyncio.sleep(sleep_time) 8 print('done after {}s'.format(sleep_time)) 9 10 11 if __name__ == '__main__': 12 task1 = get_html(2) 13 task2 = get_html(3) 14 task3 = get_html(3) 15 16 tasks = [task1, task2, task3] 17 18 loop = asyncio.get_event_loop() 19 20 try: 21 loop.run_until_complete(asyncio.gather(*tasks)) 22 except KeyboardInterrupt as e: 23 # KeyboardInterrupt 是按Ctrl+C终止程序时抛出的异常 24 # 获取所有的task 25 all_tasks = asyncio.Task.all_tasks() 26 for task in all_tasks: 27 print('cancel task') 28 print(task.cancel()) 29 loop.stop() 30 loop.run_forever() 31 finally: 32 loop.close()
waiting waiting waiting cancel task True cancel task True cancel task True