code: def _lookupName(self, name):
      if name not in self._lookup_names:
          res = self._NOT_LOOKUP_NAME_RE.sub("_", name)
          while res in self._lookup_names.values():
              res += "_"
          self._lookup_names[name] = res
      return self._lookup_names[name]
  
imports: import logging
  import re
  from io import StringIO
  from fontTools.feaLib import ast
  from fontTools.ttLib import TTFont, TTLibError
  from fontTools.voltLib import ast
  from fontTools.voltLib.parser import Parser
label_desc: Use image node_id 2 for calling the VoltToFea obj's underlying member method code with example usage: obj._lookupName(name) and returns: self