code: def base(ctx, verbose, config):
      
      # configure root logger to print to STDERR
      loglevel = LEVELS.get(min(verbose, 3))
      configure_stream(level=loglevel)
      ctx.obj = {}
      if config and os.path.exists(config):
          ctx.obj = yaml.load(open(config, 'r')) or {}
          ctx.obj['config_path'] = config
      # launch the command line interface
      logger.debug('Booting up command line interface')
docs: Puzzle: manage DNA variant resources.