code: def __init__(self):
      movav = self.p._movav(self.data, period=self.p.period)
      atr = ATR(self.data, period=self.p.period)
  
      self.lines.pgo = (self.data - movav) / atr
      super(PrettyGoodOscillator, self).__init__()
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  from .None import Indicator, MovAv, ATR
label_desc: Use image node_id 1 to create a new PrettyGoodOscillator object from inherited base classes: Indicator with example: obj = PrettyGoodOscillator()