code: def test_unicode_literals_exec(self):
      scope = {}
      exec("from __future__ import unicode_literals; x = ''", {}, scope)
      self.assertIsInstance(scope["x"], str)
  
imports: import __future__
  import ast
  import unittest
  from test.support import import_helper
  from test.support.script_helper import spawn_python, kill_python
  from textwrap import dedent
  import os
  import re
  import sys
label_desc: Use image node_id 17 for calling the FutureTest obj's underlying member method code with example usage: obj.test_unicode_literals_exec() without return types