code: def __init__(self):
      self.lines.signal = self.data0.lines[0]
      self.plotinfo.plotmaster = getattr(
          self.data0, "_clock", self.data0
      )
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import backtrader
label_desc: Use image node_id 1 to create a new Signal object from inherited base classes: bt with example: obj = Signal()