Subprocess check output returned non-zero exit status 1

Question

This is my python code   import subprocess subprocess check output  ls  shell True stderr subprocess STDOUT   import subprocess subprocess check output  yum  shell True stderr subprocess STDOUT    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 console py   line 378  in   run r   eval command  self namespace  self namespace  File   lt string gt    line 1  in  lt module gt  File   usr lib python3 4 subprocess py   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

User · Answer

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User · Answer

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 subprocess call in your case because you are ignoring the captured output  e g    import subprocess  rc   subprocess call   grep    pattern    file                         stdout subprocess DEVNULL  stderr subprocess STDOUT  if rc    0    found        elif rc    1    not found        elif rc  gt  1    error          You don t need shell True to run the commands from your question

User · Answer

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 try      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

[python] Subprocess check_output returned non-zero exit status 1

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