code: def __init__(self, period, ddof):
      assert period > 0
      super(StdDevEventWindow, self).__init__(period)
      self.__ddof = ddof
  
file_path: pyalgotrade/pyalgotrade/technical/stats.py
imports: from pyalgotrade import technical
label_desc: Use image node_id 1 to create a new StdDevEventWindow object from inherited base classes: technical with example: obj = StdDevEventWindow(period, ddof)