python 执行系统文件

        from subprocess import Popen,PIPE

        node  = 'node test.js {sessionId} "{body}" {action}'.format(sessionId=self.sessionId,body=self.body,action=self.action)
        data = Popen(node,stdout=PIPE,stderr=PIPE)
        a,b = data.communicate()
        # print(a.decode('utf-8'))
        print(b)