code: def test_parse_expression(self):
      node = parser.parse_expression("a.b")
      self.assertEqual("a", node.value.id)
      self.assertEqual("b", node.attr)
  
imports: import re
  import textwrap
  import unittest
  import gast
  from nvidia.dali._autograph.pyct import ast_util
  from nvidia.dali._autograph.pyct import errors
  from nvidia.dali._autograph.pyct import gast_util
  from nvidia.dali._autograph.pyct import parser
  from nvidia.dali._autograph.pyct import pretty_printer
label_desc: Use image node_id 23 for calling the ParserTest obj's underlying member method code with example usage: obj.test_parse_expression() without return types