原理很简单，通过python执行dos命令 ： ping 和 netsh

需要用到os和time模块

代码如下：

>>> import os
>>> print 'wifi掉线'
wifi掉线
>>> import time
>>> while True:
...     status = os.system("ping -c 1 www.baidu.com")
...     if status == 1:
...         print 'wifi掉线'
...         os.system('netsh wlan connect name=DSGY2')
...     else:
...         print '连接状态'
...     time.sleep(180)

大家使用时将name=XX ,名字改一下，在我的机子上测试通过，该脚本3分钟检测一次是否掉线

如果你的wifi在手动连接都连不上，那这段脚本就没用了

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Pinging www.a.shifen.com [14.215.177.37] with 32 bytes of data:
Reply from 14.215.177.37: bytes=32 time=24ms TTL=54
Reply from 14.215.177.37: bytes=32 time=63ms TTL=54
Reply from 14.215.177.37: bytes=32 time=32ms TTL=54
Reply from 14.215.177.37: bytes=32 time=26ms TTL=54

Ping statistics for 14.215.177.37:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 24ms, Maximum = 63ms, Average = 36ms
连接状态

Pinging www.a.shifen.com [180.97.33.108] with 32 bytes of data:
Reply from 180.97.33.108: bytes=32 time=1676ms TTL=54
Reply from 180.97.33.108: bytes=32 time=544ms TTL=54
Reply from 180.97.33.108: bytes=32 time=2033ms TTL=54
Reply from 180.97.33.108: bytes=32 time=291ms TTL=54

Ping statistics for 180.97.33.108:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 291ms, Maximum = 2033ms, Average = 1136ms
连接状态

Pinging www.a.shifen.com [180.97.33.107] with 32 bytes of data:
Reply from 180.97.33.107: bytes=32 time=126ms TTL=54
Reply from 180.97.33.107: bytes=32 time=294ms TTL=54
Reply from 180.97.33.107: bytes=32 time=57ms TTL=54
Reply from 180.97.33.107: bytes=32 time=131ms TTL=54

Ping statistics for 180.97.33.107:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 57ms, Maximum = 294ms, Average = 152ms
连接状态

----------------------------------------------------------------------------------------------------------------

昨天没有把代码保存，也没有碰到掉线的情况

#-*-coding:utf-8-*-
import os
import time
while True:
    status = os.system('ping -c 1 www.baidu.com')
    if status == 1:
        print u'wifi掉线'
        os.system('netsh wlan connect name=haha')
    else:
        print u'连接状态'
    time.sleep(30)

运行情况

Pinging www.a.shifen.com [180.97.33.108] with 32 bytes of data:
Reply from 180.97.33.108: bytes=32 time=21ms TTL=56
Reply from 180.97.33.108: bytes=32 time=22ms TTL=56
Reply from 180.97.33.108: bytes=32 time=45ms TTL=56
Reply from 180.97.33.108: bytes=32 time=25ms TTL=56

Ping statistics for 180.97.33.108:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 21ms, Maximum = 45ms, Average = 28ms
连接状态
Ping request could not find host www.baidu.com. Please check the name and try again.
wifi掉线
Connection request was completed successfully.

Pinging www.a.shifen.com [180.97.33.108] with 32 bytes of data:
Reply from 180.97.33.108: bytes=32 time=26ms TTL=56
Reply from 180.97.33.108: bytes=32 time=27ms TTL=56
Reply from 180.97.33.108: bytes=32 time=27ms TTL=56
Reply from 180.97.33.108: bytes=32 time=28ms TTL=56

Ping statistics for 180.97.33.108:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 26ms, Maximum = 28ms, Average = 27ms
连接状态

---注意：在管理员权限下运行脚本