code: def show(config, section, opt):
          
          if section not in config.keys():
              raise ConfigError("section '{}' doesn't exist".format(section))
  
          if opt not in config[section].keys():
              raise ConfigError(
                  "option '{}.{}' doesn't exist".format(section, opt)
              )
  
          logger.info(config[section][opt])
docs: Prints option value from the config.
  
          Args:
              config (configobj.ConfigObj): config to work on.
              section (str): section name.
              opt (str): option name.