code: def __setitem__(self, k: InstKT, v: InstVT) -> None:
      inst = self._read_instrument()
      inst[k] = v
      self._write_instrument(inst)
  
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 6 for calling the FileInstrumentStorage obj's underlying member method code with example usage: obj.__setitem__(k, v) without return types