code: def test_expr_bignum(self):
      tcl = self.interp
      for i in self.get_integers():
          result = tcl.call("expr", str(i))
          if self.wantobjects:
              self.assertEqual(result, i)
              self.assertIsInstance(result, int)
          else:
              self.assertEqual(result, str(i))
              self.assertIsInstance(result, str)
  
imports: import unittest
  import subprocess
  import sys
  import os
  from test import support
  from test.support import import_helper
  from test.support import os_helper
  import tkinter
  from tkinter import Tcl
  from _tkinter import TclError
label_desc: Use image node_id 34 for calling the TclTest obj's underlying member method code with example usage: obj.test_expr_bignum() without return types