一个java调用python的问题

List<String> commands = new ArrayList();
        commands.add("python");
        commands.add("/Users/yangkun/workSpace/task/task/odsdata/etl_task/etl_task.py");
        commands.add("-id");
        commands.add(id);

        ProcessBuilder processBuilder = new ProcessBuilder(commands);

        Map<String, String> env = processBuilder.environment();
        env.put("PYTHONPATH","/Users/yangkun/workSpace/sss/");

        try {
            processBuilder.start();
        } catch (IOException e) {
            e.printStackTrace();
        }

ProcessBuilder pb = new ProcessBuilder("python", "/Users/yangkun/workSpace/sss/task/odsdata/etl_task/etl_task.py","-id","1111");
        Map<String, String> env = pb.environment();
        env.put("PYTHONPATH","/Users/yangkun/workSpace/sss/");
        for (String s : env.keySet()) {
            System.out.println("key:"+ s + "  :  "+ env.get(s));
        }

        try {
            pb.start();
        } catch (IOException e) {
            e.printStackTrace();
        }