如何调用python-nmap来实现扫描局域网存活主机（代码）

#!/usr/bin/python

#_*_ coding:utf8 _*_

import netifaces,nmap

def get_gateways():

    return netifaces.gateways()['default'][netifaces.AF_INET][0]

def get_ip_lists(ip):

    ip_lists = []

    for i in range(1, 256):

        ip_lists.append('{}{}'.format(ip[:-1], i))

    return ip_lists

def main(ip=None):

    ip=get_gateways()

    ip_lists=get_ip_lists(ip)

    nmScan,temp_ip_lists,hosts = nmap.PortScanner(),[],ip[:-1]+'0/24'

    ret = nmScan.scan(hosts=hosts, arguments='-sP')

    print('扫描时间：'+ret['nmap']['scanstats']['timestr']+'\n命令参数:'+ret['nmap']['command_line'])

    for ip in ip_lists:

        print('ip地址：'+ip+'：')

        if ip not in ret['scan']:

            temp_ip_lists.append(ip)

            print('扫描超时')

        else:print('已扫描到主机，主机名：'+ret['scan'][ip]['hostnames'][0]['name'])

    print(str(hosts) +' 网络中的存活主机:')

    for ip in temp_ip_lists:ip_lists.remove(ip)

    for ip in ip_lists:print(ip)

if __name__ == '__main__':

    main()