How to check if the network is connected

通过判断请求百度谷歌首页成功与否，即可确认本地主机是否已接入网络。

import urllib.request


def network_check(host='https://www.baidu.com'):
    try:
        r = urllib.request.urlopen(host)
        return True
    except:
        return False

print('网络已连接！' if network_check() else '网络未连接！')

Reference

• https://stackoverflow.com/questions/3764291/checking-network-connection