class_docstr: Tool to maintain statistical data in a window.
      
code: def add(self, obj):
      self.items[self.idx] = obj
      self.idx += 1
      self.count += 1
      self.idx %= len(self.items)
  
imports: import numpy
label_desc: Use image node_id 2 for calling the WindowStat obj's underlying member method code with example usage: obj.add(obj) without return types