code: def dump(self):
      self._calendars_list = self._read_calendars(
          self._calendars_dir.joinpath(f"{self.freq}.txt")
      )
      # noinspection PyAttributeOutsideInit
      self._old_instruments = (
          self._read_instruments(
              self._instruments_dir.joinpath(self.INSTRUMENTS_FILE_NAME)
          )
          .set_index([self.symbol_field_name])
          .to_dict(orient="index")
      )  # type: dict
      self._dump_instruments()
      self._dump_features()
  
imports: import abc
  import shutil
  import traceback
  from pathlib import Path
  from typing import Iterable, List, Union
  from functools import partial
  from concurrent.futures import ThreadPoolExecutor, as_completed, ProcessPoolExecutor
  import fire
  import numpy
  import pandas
  from tqdm import tqdm
  from loguru import logger
  from qlib.utils import fname_to_code, code_to_fname
label_desc: Use image node_id 2 for calling the DumpDataFix obj's underlying member method code with example usage: obj.dump() without return types