docstr: x.__getitem__(k) <==> x[k]
docstr_tok: ["x.__getitem__","(","k",")","<","==",">","x","[","k","]"]
code: def __getitem__(self, k: InstKT) -> InstVT:
      """x.__getitem__(k) <==> x[k]"""
      raise NotImplementedError(
          "Subclass of InstrumentStorage must implement `__getitem__` 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 7 for calling the InstrumentStorage obj's underlying member method code with example usage: obj.__getitem__(k) without return types