code: def __init__(self, dataSeries, maxLen=None):
      super(Ratio, self).__init__(
          dataSeries, RatioEventWindow(), maxLen
      )
  
file_path: pyalgotrade/pyalgotrade/technical/ratio.py
imports: from pyalgotrade import technical
  from pyalgotrade import utils
label_desc: Use image node_id 1 to create a new Ratio object from inherited base classes: technical with example: obj = Ratio(dataSeries, maxLen)