code: def _groupName(self, group):
      try:
          name = group.group
      except AttributeError:
          name = group
      return ast.GlyphClassName(self._glyphclasses[name.lower()])
  
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 8 for calling the VoltToFea obj's underlying member method code with example usage: obj._groupName(group) and returns: ast