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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _validate_enum(self, item: Any, enum: Any) -> Any: """Validate enum parameter of method in subclasses of BaseProvider. :param item: Item of enum object. :param enum: Enum object. :return: Value of item. :raises NonEnumerableError: if ``item`` not in ``enum``. """

        if item is None:
            result = get_random_item(enum, self.random)
        elif item and isinstance(item, enum):
            result = item
        else:
            raise NonEnumerableError(enum)

        return result.value