docstr: Delete self[key].
  
  Raises
  ------
  ValueError
      If the data(storage) does not exist, raise ValueError
docstr_tok: ["Delete","self","[","key","]",".","Raises","--","--","--","ValueError","If","the","data","(","storage",")","does","not","exist",",","raise","ValueError"]
code: def __delitem__(self, k: InstKT) -> None:
      """Delete self[key].
  
      Raises
      ------
      ValueError
          If the data(storage) does not exist, raise ValueError
      """
      raise NotImplementedError(
          "Subclass of InstrumentStorage must implement `__delitem__` 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 6 for calling the InstrumentStorage obj's underlying member method code with example usage: obj.__delitem__(k) without return types