aws cli を呼べる環境なら、次の pthon で動作中の task arn を for 文で処理できるよ
import subprocess import json from typing import Union, List def callCommand(commands: List[str]) -> str: """ コマンド呼び出しと標準出力文字列を返す """ cmd = [] for command in commands: cmd.append(command) subprocess.call(cmd) output = subprocess.Popen(cmd, stdout=subprocess.PIPE) return output.communicate()[0] def main(): cmd = [] cmd.append("aws") cmd.append("ecs") cmd.append("list-tasks") cmd.append("--region=ap-northeast-1") cmd.append("--cluster") cmd.append("clustername") cmd.append("--service-name") cmd.append("servicename") jsonS = callCommand(cmd) for taskArn in json.loads(jsonS)['taskArns']: print(taskArn) if __name__ == "__main__": main()