code: def dump(self):
      self.save_calendars(self._new_calendar_list)
      self._dump_features()
      df = pd.DataFrame.from_dict(
          self._update_instruments, orient="index"
      )
      df.index.names = [self.symbol_field_name]
      self.save_instruments(df.reset_index())
  
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 6 for calling the DumpDataUpdate obj's underlying member method code with example usage: obj.dump() without return types