code: def validate_term(self, term, latest_only=False):
          
  
          if latest_only:
              if term == self.metadata['terms'][-1]['name']:
                  return True
              else:
                  raise NoDataForPeriod(term)
  
          for t in self.metadata['terms']:
              if term == t['name']:
                  return True
          raise NoDataForPeriod(term)
docs: Check that a term is present in the metadata dictionary.
  
          raises :exc:`~billy.scrape.NoDataForPeriod` if term is invalid
  
          :param term:        string representing term to check
          :param latest_only: if True, will raise exception if term is not
                              the current term (default: False)