Python'subprocess'CalledProcessError：命令'[…]'返回非零退出状态1 [重复]

Question

这个问题已经在这里有了答案 ：

子流程check_output返回非零退出状态1 （2个答案）

3年前关闭。

执行以下脚本…

import socket                   
import sys

from collections import OrderedDict
from subprocess import check_output
from threading import Thread

[…]

class IpCheck(Thread):

    RECEIVED_PACKAGES_RE = re.compile(r'(\d+) received')

    def __init__(self, ip):                         
        Thread.__init__(self)
        self.ip = ip
        self.result = None

    def run(self):                          
        match = self.RECEIVED_PACKAGES_RE.search(
            check_output(['ping', '-q', '-c2', '-W1', self.ip])
        )

        successful_ping_count = int(match.group(1)) if match else 0

        if successful_ping_count == 0:
            self.result = 'no response'
        elif successful_ping_count == 1:
            self.result = 'alive, but 50% package loss'
        elif successful_ping_count == 2:
            self.result = check_snmp(self.ip)
        else:
            assert False

[...]

…导致错误：

CalledProcessError：命令’[ping’，’-q’，’-c2’，’-W1’，‘10 .81.3.80’]’返回非零退出状态1

在中添加“ stderr = STDOUT”check_output不会产生任何有用的反馈。

如何获取有关该错误的更多信息，以便进行故障排除？

Answer 1

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