docs: def loop_through_agency(self):
          """Loop through an agency to grab the definitions for its tables."""
          agency = self.agency
          with open(agency + '.txt') as f:
              data = eval(f.read())
          for table in data:
              for column in data[table]:
                  value_link = data[table][column]
                  data[table][column] = self.grab_definition(value_link)
          data = json.dumps(data)
          with open(agency + '_values.json', 'w') as f:
              f.write(str(data))