class_docstr: The behavior of CalendarStorage's methods and List's methods of the same name remain consistent
class_docstr_tok: ["The","behavior","of","CalendarStorage","'s","methods","and","List","'s","methods","of","the","same","name","remain","consistent"]
docstr: Raises
  ------
  ValueError
      If the data(storage) does not exist, raise ValueError
docstr_tok: ["Raises","--","--","--","ValueError","If","the","data","(","storage",")","does","not","exist",",","raise","ValueError"]
code: def __delitem__(self, i) -> None:
      """
      Raises
      ------
      ValueError
          If the data(storage) does not exist, raise ValueError
      """
      raise NotImplementedError(
          "Subclass of CalendarStorage must implement `__delitem__(i: int)`/`__delitem__(s: slice)`  method"
      )
  
imports: import re
  from typing import Iterable, overload, Tuple, List, Text, Union, Dict
  import numpy
  import pandas
  from qlib.log import get_module_logger
label_desc: Use image node_id 13 for calling the CalendarStorage obj's underlying member method code with example usage: obj.__delitem__(i) without return types