code: def _tuple_from_list_or_tuple(bbox):
          
          if len(bbox) == 4:
              return tuple(map(float, bbox))
          if len(bbox) == 2 and all([isinstance(point, (list, tuple)) for point in bbox]):
              return BBox._tuple_from_list_or_tuple(bbox[0] + bbox[1])
          raise TypeError('Expected a valid list or tuple representation of a bbox')
docs: Converts a list or tuple representation of a bbox into a flat tuple representation.
  
          :param bbox: a list or tuple with 4 coordinates that is either flat or nested
          :return: tuple (min_x,min_y,max_x,max_y)
          :raises: TypeError