code: def __len__(self) -> int:
      return self.length
  
imports: from __future__ import annotations
  import dataclasses
  from operator import itemgetter
  from typing import cast, Optional, List, Union, Collection, Any, Mapping
  import numpy
  from toolz import first, valmap, dissoc, merge, itemmap, take
  from gluonts import maybe
  from gluonts.itertools import pluck_attr, columns_to_rows, rows_to_columns, select, join_items
  from ._base import Pad, TimeBase
  from ._freq import Freq
  from ._period import Periods, Period, period
  from ._repr import html_table
  from ._util import AxisView, pad_axis, _replace
  from ._time_series import BatchTimeSeries, TimeSeries
  from ._split_frame import SplitFrame
label_desc: Use image node_id 26 for calling the TimeFrame obj's underlying member method code with example usage: obj.__len__() and returns: self