code: def test_parameters(self):
      for sym in ("a", "var", "kw"):
          self.assertTrue(self.spam.lookup(sym).is_parameter())
      self.assertFalse(self.spam.lookup("x").is_parameter())
  
imports: import symtable
  import unittest
  from test import support
  from test.support import os_helper
label_desc: Use image node_id 13 for calling the SymtableTest obj's underlying member method code with example usage: obj.test_parameters() without return types