code: def __init__(self, **kwargs):
      super().__init__()
      self._data = sorted(self.df["datetime"].unique())
  
imports: from typing import Union, List, Dict, Tuple
  import unittest
  import pandas
  import numpy
  import io
  from .data import GetData
  from ..None import init
  from ..constant import REG_CN, REG_TW
  from qlib.data.filter import NameDFilter
  from qlib.data import D
  from qlib.data.data import Cal, DatasetD
  from qlib.data.storage import CalendarStorage, InstrumentStorage, FeatureStorage, CalVT, InstKT, InstVT
label_desc: Use image node_id 1 to create a new MockCalendarStorage object from inherited base classes: MockStorageBase, CalendarStorage with example: obj = MockCalendarStorage()