code: def __missing__(self, v):
      return self.missing_func(v)
  
file_path: catboost/contrib/python/fonttools/fontTools/cffLib/width.py
imports: from fontTools.ttLib import TTFont
  from collections import defaultdict
  from operator import add
  from functools import reduce
label_desc: Use image node_id 2 for calling the missingdict obj's underlying member method code with example usage: obj.__missing__(v) and returns: self