Subprocess check_output returned non-zero exit status 1

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Question :

Subprocess check_output returned non-zero exit status 1

This is my python code:

import subprocess

import subprocess

The first .check_output() works well, but the second returns this:

Traceback (most recent call last):
File "/usr/lib/x86_64-linux-gnu/gedit/plugins/pythonconsole/", line 378, in __run
r = eval(command, self.namespace, self.namespace)
File "<string>", line 1, in <module>
File "/usr/lib/python3.4/", line 616, in check_output
raise CalledProcessError(retcode, process.args, output=output)
subprocess.CalledProcessError: Command 'yum' returned non-zero exit status 1

Why does this happen? Is it because ls is the original shell command but yum is the new package? How can I solve this problem?

Answer #1:

The command yum that you launch was executed properly. It returns a non zero status which means that an error occured during the processing of the command. You probably want to add some argument to your yum command to fix that.

Your code could show this error this way:

import subprocess
    subprocess.check_output("dir /f",shell=True,stderr=subprocess.STDOUT)
except subprocess.CalledProcessError as e:
    raise RuntimeError("command '{}' return with error (code {}): {}".format(e.cmd, e.returncode, e.output))
Answered By: Plouff

Answer #2:

The word check_ in the name means that if the command (the shell in this case that returns the exit status of the last command (yum in this case)) returns non-zero status then it raises CalledProcessError exception. It is by design. If the command that you want to run may return non-zero status on success then either catch this exception or don’t use check_ methods. You could use in your case because you are ignoring the captured output, e.g.:

import subprocess

rc =['grep', 'pattern', 'file'],
                     stdout=subprocess.DEVNULL, stderr=subprocess.STDOUT)
if rc == 0: # found
elif rc == 1: # not found
elif rc > 1: # error

You don’t need shell=True to run the commands from your question.

Answered By: jfs

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