code: def parse_ppem_(self):
      location = self.cur_token_location_
      ppem_name = self.cur_token_
      value = self.expect_number_()
      setting = ast.SettingDefinition(
          ppem_name, value, location=location
      )
      return setting
  
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 25 for calling the Parser obj's underlying member method code with example usage: obj.parse_ppem_() and returns: setting