code: def start_tree(self, tree, filename):
      super(FixImports, self).start_tree(tree, filename)
      self.replace = {}
  
file_path: catboost/contrib/tools/python/src/Lib/lib2to3/fixes/fix_imports.py
imports: from ..None import fixer_base
  from ..fixer_util import Name, attr_chain
label_desc: Use image node_id 4 for calling the FixImports obj's underlying member method code with example usage: obj.start_tree(tree, filename) without return types