在Python中使用子进程ping地址并获得平均ping输出？

import subprocess

def ping_average(address):
    try:
        # 执行ping命令
        ping_process = subprocess.Popen(['ping', '-c', '4', address], stdout=subprocess.PIPE)
        ping_output = ping_process.communicate()[0].decode('utf-8')

        # 解析ping输出，提取平均延迟时间
        lines = ping_output.split('\n')
        for line in lines:
            if line.startswith('rtt'):
                average_ping = line.split('/')[3]
                return float(average_ping)
        
        return None
    except subprocess.CalledProcessError:
        return None

# 示例用法
address = 'www.example.com'
average_ping = ping_average(address)
if average_ping is not None:
    print(f'平均延迟时间：{average_ping}ms')
else:
    print('无法ping通地址')