code: def encode_unicode(f):
      
      @wraps(f)
      def wrapped(obj, error):
  
          def _encode(value):
              """Helper encoding unicode strings into binary utf-8"""
              if isinstance(value, unicode):  # noqa: F821
                  return value.encode('utf-8')
              return value
  
          error = copy(error)
          error.document_path = _encode(error.document_path)
          error.schema_path = _encode(error.schema_path)
          error.constraint = _encode(error.constraint)
          error.value = _encode(error.value)
          error.info = _encode(error.info)
          return f(obj, error)
  
      return wrapped if PYTHON_VERSION < 3 else f
docs: Cerberus error messages expect regular binary strings.
      If unicode is used in a ValidationError message can't be printed.
  
      This decorator ensures that if legacy Python is used unicode
      strings are encoded before passing to a function.