subprocess.check_output提出CalledProcessError上非零退出代码，ping返回非零退出代码，如果事情是错误的（如未知的域名或网站关闭，或者网站有ICMP阻塞出于某种原因，或者您的Internet连接已断开） 。
如果要检查输出和退出代码，请使用subprocess.Popen：
import subprocess
import sys
site = sys.argv[1]
ping_count = 4
process = subprocess.Popen(['ping', site, '-c', str(ping_count)],
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT)
returncode = process.wait()
print('ping returned {0}'.format(returncode))
print(process.stdout.read())
例子：
$ python ping.py google.com <-- ping successful
ping returned 0
PING google.com (195.64.213.27) 56(84) bytes of data.
64 bytes from cache.google.com (195.64.213.27): icmp_seq=1 ttl=57 time=59.8 ms
64 bytes from cache.google.com (195.64.213.27): icmp_seq=2 ttl=57 time=2.43 ms
64 bytes from cache.google.com (195.64.213.27): icmp_seq=3 ttl=57 time=77.0 ms
64 bytes from cache.google.com (195.64.213.27): icmp_seq=4 ttl=57 time=43.8 ms
--- google.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 2.439/45.802/77.096/27.658 ms
$ python ping.py asdasdas.com <-- DNS resolved, but site is down
ping returned 1
PING asdasdas.com (69.172.201.208) 56(84) bytes of data.
--- asdasdas.com ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3024ms
$ python ping.py asdasdasdasda.com <-- DNS Failed
ping returned 2
ping: unkNown host asdasdasdasda.com
602392714
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