code: def __load_countries(self, db):
          
  
          try:
              countries = self.__read_countries_file()
          except IOError as e:
              raise LoadError(str(e))
  
          try:
              with db.connect() as session:
                  for country in countries:
                      session.add(country)
          except Exception as e:
              raise LoadError(str(e))
docs: Load the list of countries