code: def _read_calendars(calendar_path: Path) -> List[pd.Timestamp]:
      return sorted(
          map(
              pd.Timestamp,
              pd.read_csv(calendar_path, header=None)
              .loc[:, 0]
              .tolist(),
          )
      )
  
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 8 for calling the DumpDataBase obj's underlying member method code with example usage: obj._read_calendars(calendar_path) and returns: sorted