在linux系统下（w有效）(mac 下w无效)：
    实现pingIP地址的功能，-c1指发送报文一次，-w1指等待1秒 

    1. import requests,time
    2. from base64 import b64encode
    3. import os 
    4. import sys
    6. def ping_baidu():
    7.     ip = 'www.baidu.com'
    8.     backinfo = os.system('ping -c 1 -w 1 %s'%ip)
    9.     # print(backinfo)
    10.     return backinfo
    12. '''
    13. res = ping_baidu()
    14. print('-'*100)
    15. print(res)
    16. print('-'*100)
    17. '''
    19. n = 1
    20. while 1:
    21.     if ping_baidu() != 0:
    22.         # 断网情况返回 512，联网情况返回 0 
    23.         time.sleep(5)
    24.         n+=1
    25.         print('-'*20,n,'-'*20)
    26.         if log != 'connect':
    27.             flog = open('log.txt','w')
    28.             flog.write(str(log))

    linux

    1. Usage: ping [-aAbBdDfhLnOqrRUvV] [-c count] [-i interval] [-I interface]
    2.             [-m mark] [-M pmtudisc_option] [-l preload] [-p pattern] [-Q tos]
    3.             [-s packetsize] [-S sndbuf] [-t ttl] [-T timestamp_option]
    4.             [-w deadline] [-W timeout] [hop1 ...] destination

    mac

    1. usage: ping [-AaDdfnoQqRrv] [-c count] [-G sweepmaxsize]
    2.             [-g sweepminsize] [-h sweepincrsize] [-i wait]
    3.             [-l preload] [-M mask | time] [-m ttl] [-p pattern]
    4.             [-S src_addr] [-s packetsize] [-t timeout][-W waittime]
    5.             [-z tos] host
    6.        ping [-AaDdfLnoQqRrv] [-c count] [-I iface] [-i wait]
    7.             [-l preload] [-M mask | time] [-m ttl] [-p pattern] [-S src_addr]
    8.             [-s packetsize] [-T ttl] [-t timeout] [-W waittime]
    9.             [-z tos] mcast-group
    10. Apple specific options (to be specified before mcast-group or host like all options)
    11.             -b boundif           # bind the socket to the interface
    12.             -k traffic_class     # set traffic class socket option
    13.             -K net_service_type  # set traffic class socket options
    14.             -apple-connect       # call connect(2) in the socket
    15.             -apple-time          # display current time