parameters: (*popenargs, **kwargs)
return_statement: return output
docstring: r"""Run command with arguments and return its output as a byte string.
  
      If the exit code was non-zero it raises a CalledProcessError.  The
      CalledProcessError object will have the return code in the returncode
      attribute and output in the output attribute.
  
      The arguments are the same as for the Popen constructor.  Example:
  
      >>> check_output(["ls", "-l", "/dev/null"])
      'crw-rw-rw- 1 root root 1, 3 Oct 18  2007 /dev/null\n'
  
      The stdout argument is not allowed as it is used internally.
      To capture standard error in the result, use stderr=STDOUT.
  
      >>> check_output(["/bin/sh", "-c",
      ...               "ls -l non_existent_file ; exit 0"],
      ...              stderr=STDOUT)
      'ls: non_existent_file: No such file or directory\n'
docstring_summary: r"""Run command with arguments and return its output as a byte string.
docstring_tokens: r Run command with arguments and return its output as a byte string .
function: def check_output(*popenargs, **kwargs):
      r"""Run command with arguments and return its output as a byte string.
  
      If the exit code was non-zero it raises a CalledProcessError.  The
      CalledProcessError object will have the return code in the returncode
      attribute and output in the output attribute.
  
      The arguments are the same as for the Popen constructor.  Example:
  
      >>> check_output(["ls", "-l", "/dev/null"])
      'crw-rw-rw- 1 root root 1, 3 Oct 18  2007 /dev/null\n'
  
      The stdout argument is not allowed as it is used internally.
      To capture standard error in the result, use stderr=STDOUT.
  
      >>> check_output(["/bin/sh", "-c",
      ...               "ls -l non_existent_file ; exit 0"],
      ...              stderr=STDOUT)
      'ls: non_existent_file: No such file or directory\n'
      """
      if 'stdout' in kwargs:
          raise ValueError('stdout argument not allowed, it will be overridden.')
      process = subprocess.Popen(stdout=subprocess.PIPE, *popenargs, **kwargs)
      output, unused_err = process.communicate()
      retcode = process.poll()
      if retcode:
          cmd = kwargs.get("args")
          if cmd is None:
              cmd = popenargs[0]
          raise CalledProcessError(retcode, cmd, output=output)
      return output
function_tokens: def check_output ( * popenargs , * * kwargs ) : if 'stdout' in kwargs : raise ValueError ( 'stdout argument not allowed, it will be overridden.' ) process = subprocess . Popen ( stdout = subprocess . PIPE , * popenargs , * * kwargs ) output , unused_err = process . communicate ( ) retcode = process . poll ( ) if retcode : cmd = kwargs . get ( "args" ) if cmd is None : cmd = popenargs [ 0 ] raise CalledProcessError ( retcode , cmd , output = output ) return output