docs: def check_output(*args, **kwargs):
      '''Compatibility wrapper for Python 2.6 missin g subprocess.check_output'''
      if hasattr(subprocess, 'check_output'):
          return subprocess.check_output(stderr=subprocess.STDOUT, universal_newlines=True,
                                         *args, **kwargs)
      else:
          process = subprocess.Popen(*args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
                                     universal_newlines=True, **kwargs)
          output, _ = process.communicate()
          retcode = process.poll()
          if retcode:
              error = subprocess.CalledProcessError(retcode, args[0])
              error.output = output
              raise error
          return output