如何在Python中超时子进程

import subprocess
import signal

def run_with_timeout(command, timeout):
    # 创建子进程
    process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

    try:
        # 等待子进程执行完成，设置超时时间
        stdout, stderr = process.communicate(timeout=timeout)
        return stdout.decode('utf-8'), stderr.decode('utf-8')
    except subprocess.TimeoutExpired:
        # 如果超时，终止子进程
        process.send_signal(signal.SIGINT)
        process.wait()
        return None, None

stdout, stderr = run_with_timeout(['ping', 'www.example.com'], 5)
if stdout is not None:
    print('标准输出:', stdout)
if stderr is not None:
    print('标准错误输出:', stderr)