code: def resolve_group(self, group_name):
      return self.groups_.resolve(group_name)
  
imports: import fontTools.voltLib.ast
  from fontTools.voltLib.lexer import Lexer
  from fontTools.voltLib.error import VoltLibError
  from io import open
label_desc: Use image node_id 23 for calling the Parser obj's underlying member method code with example usage: obj.resolve_group(group_name) and returns: self