code: def _conf(cls, opts):
          
          if not opts.logging_conf_file:
              return False
  
          if not os.path.exists(opts.logging_conf_file):
              # FileNotFoundError added only in Python 3.3
              # https://docs.python.org/3/whatsnew/3.3.html#pep-3151-reworking-the-os-and-io-exception-hierarchy
              raise OSError("Error: Unable to locate specified logging configuration file!")
  
          logging.config.fileConfig(opts.logging_conf_file, disable_existing_loggers=False)
          return True
docs: Setup logging via ini-file from logging_conf_file option.