我正在使用check_output从python的子进程模块中调用shell命令。
如下所示,通过将stderr重定向到stdout,我尝试获取执行错误的Shell命令lsl -l
的错误消息。但这显然不起作用。为什么?
In [5]: subprocess.check_output("lsl -l", shell=True,stderr=subprocess.STDOUT)
---------------------------------------------------------------------------
CalledProcessError Traceback (most recent call last)
<ipython-input-5-8dd15c76eb0f> in <module>
----> 1 subprocess.check_output("lsl -l", shell=True,stderr=subprocess.STDOUT)
/usr/lib/python3.5/subprocess.py in check_output(timeout, *popenargs, **kwargs)
624
625 return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
--> 626 **kwargs).stdout
627
628
/usr/lib/python3.5/subprocess.py in run(input, timeout, check, *popenargs, **kwargs)
706 if check and retcode:
707 raise CalledProcessError(retcode, process.args,
--> 708 output=stdout, stderr=stderr)
709 return CompletedProcess(process.args, retcode, stdout, stderr)
710
CalledProcessError: Command 'lsl -l' returned non-zero exit status 127
CalledProcessError。有关更多详细信息,请参见check_output。尝试以下命令:
subprocess.check_output("lsl -l;exit 0;", shell=True,stderr=subprocess.STDOUT)