如何使用python终止运行在linux的父终端和n个子终端的进程？

import os
import subprocess

def terminate_processes():
    # 获取父进程的PID
    parent_pid = os.getpid()
    
    # 终止父进程
    os.kill(parent_pid, signal.SIGTERM)
    
    # 创建子进程并获取PID
    child_pids = []
    for i in range(n):
        process = subprocess.Popen(['command'], shell=True)
        child_pids.append(process.pid)
    
    # 终止子进程
    for pid in child_pids:
        os.kill(pid, signal.SIGTERM)