code: def _plotinit(self):
      self.plotinfo.plotyhlines = [self.p.upperband, self.p.lowerband]
  
file_path: backtrader/backtrader/indicators/stochastic.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  from .None import Indicator, Max, MovAv, Highest, Lowest, DivByZero
label_desc: Use image node_id 2 for calling the _StochasticBase obj's underlying member method code with example usage: obj._plotinit() without return types