python - 子进程' check_output - 返回 shell 消息

Question

这是我的代码:

from subprocess import check_output
print check_output('whoami', shell=True)

这很好用。

但是，如果我输入一个不存在的命令，它会说:

raise CalledProcessError(retcode, cmd, output=output)
CalledProcessError: Command 'test' returned non-zero exit status 1

如果您要在 shell 上运行此命令，它会显示如下内容:

'test' isnot recognized as an intenral or external command, operable program or batch file.

我怎样才能得到这个？

Answer 1

正如您在 subprocess.check_output 中所读到的那样文档:

If the return code was non-zero it raises a CalledProcessError. The CalledProcessError object will have the return code in the returncode attribute and any output in the output attribute.

所以你可以这样做:

import subprocess

try:
    print subprocess.check_output('test', shell=True)
except subprocess.CalledProcessError, e:
    print e.output