创建一个python脚本来统计使用tcpdump到达网站的数据包数量？

import subprocess

def count_packets():
    # 执行tcpdump命令并捕获输出结果
    tcpdump_process = subprocess.Popen(['tcpdump', '-c', '100', 'tcp'], stdout=subprocess.PIPE)
    output, _ = tcpdump_process.communicate()

    # 统计数据包数量
    packet_count = output.decode().count('\n')

    return packet_count

if __name__ == '__main__':
    packet_count = count_packets()
    print(f"网站收到的数据包数量：{packet_count}")