code: def __init__(self):
      if not self.p.ondata:
          a = self.data.high - self.data.low
      else:
          a = 1.05 * (self.data.high + self.data.low) / 2.0
  
      b = bt.LinePlotterIndicator(a, name="hilo")
      b.plotinfo.subplot = not self.p.ondata
  
file_path: backtrader/samples/lineplotter/lineplotter.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import argparse
  import datetime
  import backtrader
label_desc: Use image node_id 1 to create a new St object from inherited base classes: bt with example: obj = St()