code: def test_string(value):
      """Return true if the object is a string."""
      return isinstance(value, string_types)
  
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 14 for calling a global function with example usage: test_string(value) and returns: isinstance