code: def _find_config(self, config_file):
          
          msg = ('Configuration file [ %s ] was not found.' % self.filename)
          self.log.fatal(msg)
          raise IOError(msg)
docs: This method will check if the configuration file "exist"
  
          If it does NOT then the method will bail calling an IOError.
  
          :param config_file: ``str``
          :return: ``str``