Question

我写了一个简单的脚本来记录我的连接状态（因为我想记录我的ISP断开连接的频率）。当可以访问IP时，以下脚本可以使用：

import subprocess
from datetime import datetime

cmd = ['/bin/ping -c 1 -w2 8.8.8.8 > /dev/null 2>&1']
response = subprocess.check_call(cmd, shell=True, stderr=subprocess.STDOUT)
time_stamp = str(datetime.now().strftime('%Y-%m-%d %H:%M:%S'))
log_file = "ping_check.log"

if response == 0:
    log_entry = time_stamp + ': up\n'
    with open(log_file, "a") as logfile:
        logfile.write(log_entry)
else:
    log_entry = time_stamp + ': down\n'
    with open(log_file, "a") as logfile:
        logfile.write(log_entry)

但是，当我使用无法访问的IP运行脚本时，我得到以下内容：

shw@ventura:~/Desktop$ ./ping_check_test.py
Traceback (most recent call last):
  File "./ping_check_test.py", line 12, in <module>
    response = subprocess.check_call(cmd, shell=True, stderr=subprocess.STDOUT)
  File "/usr/lib/python2.7/subprocess.py", line 540, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/bin/ping -c 1 -w2 10.0.0.1 > /dev/null 2>&1']' returned non-zero exit status 1

我该如何处理？我也看了check_output，但这似乎也不是我想做的。

Answer 1

您可以捕获异常：

try:
    response = subprocess.check_call(cmd, shell=True, stderr=subprocess.STDOUT)
except subprocess.CalledProcessError as err:
    print "Could not ping"
    response = err.returncode

但在您的情况下，您可能希望使用subprocess.call() function;它与subprocess.check_call()完全相同，但当返回状态不为0时，不会引发异常：

response = subprocess.call(cmd, shell=True, stderr=subprocess.STDOUT)

处理subprocess.check_call的错误

1 个答案: