Question

我正在使用这样的子流程

args = ['commandname', 'some args']
subprocess.check_output(args)

有时我会收到此错误

command returned non-zero exit status 1

有没有办法，如果获得非零退出状态，那么系统会使用该消息引发异常，如

output = subprocess.check_output(args)
if non zero exit :
   raise Exception(errormessage)

Answer 1

您可以使用名为subprocess [docs]

的returncode属性

Popen.returncode 
  The child return code, set by poll() and wait() (and indirectly by communicate()). 
  A None value indicates that the process hasn’t terminated yet.

  A negative value -N indicates that the child was terminated by signal N (Unix only).

所以它应该像这样工作（没有经过测试的代码） -

import subprocess
args  = ['commandname', 'some args']
child = subprocess.Popen(args, stdout=subprocess.PIPE)
streamdata = child.communicate()[0]
returncode = child.returncode
if returncode != 0:
    raise Exception

如果我在python中使用subprocess，我怎么能显示错误

1 个答案: