code: def __init__(
      self, freq: str, future: bool, provider_uri: dict = None, **kwargs
  ):
      super(FileCalendarStorage, self).__init__(freq, future, **kwargs)
      self.future = future
      self._provider_uri = (
          None
          if provider_uri is None
          else C.DataPathManager.format_provider_uri(provider_uri)
      )
      self.enable_read_cache = True  # TODO: make it configurable
      self.region = C["region"]
  
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 1 to create a new FileCalendarStorage object from inherited base classes: FileStorageMixin, CalendarStorage with example: obj = FileCalendarStorage(freq, future, provider_uri)