code: def _on_timer_done(self, timer):
      self._timer = None
      self.set_done()
  
imports: from dataclasses import dataclass, field
  from datetime import datetime
  from typing import ClassVar, List, Optional, Union
  from eventkit import Event, Op
  from ib_insync.contract import Contract
  from ib_insync.objects import DOMLevel, Dividends, FundamentalRatios, MktDepthData, OptionComputation, TickByTickAllLast, TickByTickBidAsk, TickByTickMidPoint, TickData
  from ib_insync.util import dataclassRepr, isNan
label_desc: Use image node_id 4 for calling the TimeBars obj's underlying member method code with example usage: obj._on_timer_done(timer) without return types