code: def __add__(self, other):
      NL = NodeList()
      NL.extend(other)
      return NL
  
file_path: catboost/contrib/tools/python3/src/Lib/xml/dom/minicompat.py
imports: import xml.dom
label_desc: Use image node_id 1 for calling the EmptyNodeList obj's underlying member method code with example usage: obj.__add__(other) and returns: NL