python 获取IP地址

思路是先获取网关，再拿到对应的IP信息，这样可以在没有公网是也能拿到地址：

import netifaces

def get_host_ip():
    try:
        gws = netifaces.gateways()
        net_name = gws['default'][netifaces.AF_INET][1]
        info = netifaces.ifaddresses(net_name)
        ip = info[netifaces.AF_INET][0]['addr']
    except:
        ip = None
    return ip