code: def __init__(self):
      super(RatioEventWindow, self).__init__(2)
  
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 RatioEventWindow object from inherited base classes: technical with example: obj = RatioEventWindow()