docs: def load_json(data=None, path=None, name='NT'):
      """ Map namedtuples with json data. """
      if data and not path:
          return mapper(json.loads(data), _nt_name=name)
      if path and not data:
          return mapper(json.load(path), _nt_name=name)
      if data and path:
          raise ValueError('expected one source and received two')