code: def __init__(self):
      self.lines.pctchange = self.data / self.data(-self.p.period) - 1.0
      super(PercentChange, self).__init__()
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  from .None import Indicator
label_desc: Use image node_id 1 to create a new PercentChange object from inherited base classes: Indicator with example: obj = PercentChange()