code: def _read_instruments(self, instrument_path: Path) -> pd.DataFrame:
      df = pd.read_csv(
          instrument_path,
          sep=self.INSTRUMENTS_SEP,
          names=[
              self.symbol_field_name,
              self.INSTRUMENTS_START_FIELD,
              self.INSTRUMENTS_END_FIELD,
          ],
      )
  
      return df
  
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 9 for calling the DumpDataBase obj's underlying member method code with example usage: obj._read_instruments(instrument_path) and returns: df