code: def test_undefined(value):
      """Like :func:`defined` but the other way round."""
      return isinstance(value, Undefined)
  
imports: import decimal
  import operator
  import re
  from ._compat import abc
  from ._compat import integer_types
  from ._compat import string_types
  from ._compat import text_type
  from .runtime import Undefined
label_desc: Use image node_id 5 for calling a global function with example usage: test_undefined(value) and returns: isinstance