code: def append(self, value):
      if value not in self.unique_values:
          self.values.append(value)
          self.unique_values.add(value)
  
file_path: catboost/contrib/python/pythran/pythran/cxxtypes.py
imports: from inspect import isclass
label_desc: Use image node_id 2 for calling the ordered_set obj's underlying member method code with example usage: obj.append(value) without return types