code: def data(self) -> List[CalVT]:
      self.check()
      # If cache is enabled, then return cache directly
      if self.enable_read_cache:
          key = "orig_file" + str(self.uri)
          if key not in H["c"]:
              H["c"][key] = self._read_calendar()
          _calendar = H["c"][key]
      else:
          _calendar = self._read_calendar()
      if Freq(self._freq_file) != Freq(self.freq):
          _calendar = resam_calendar(
              np.array(list(map(pd.Timestamp, _calendar))),
              self._freq_file,
              self.freq,
              self.region,
          )
      return _calendar
  
imports: import struct
  from pathlib import Path
  from typing import Iterable, Union, Dict, Mapping, Tuple, List
  import numpy
  import pandas
  from qlib.utils.time import Freq
  from qlib.utils.resam import resam_calendar
  from qlib.config import C
  from qlib.data.cache import H
  from qlib.log import get_module_logger
  from qlib.data.storage import CalendarStorage, InstrumentStorage, FeatureStorage, CalVT, InstKT, InstVT
label_desc: Use image node_id 7 for calling the FileCalendarStorage obj's underlying member method code with example usage: obj.data() and returns: _calendar