code: def old_func(self, x):
      return x
  
imports: import inspect
  import sys
  import pytest
  import numpy
  from numpy.core import arange
  from numpy.testing import assert_, assert_equal, assert_raises_regex
  from numpy.lib import deprecate, deprecate_with_doc
  import numpy.lib.utils
  from io import StringIO
label_desc: Use image node_id 2 for calling a global function with example usage: old_func(x) and returns: x