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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 description(self):
 """The description for this task. See: https://cloud.google.com/appengine/docs/python/taskqueue/rest/tasks :rtype: string :returns: The description for this task. """

        if self._description is None:
            if 'payloadBase64' not in self._properties:
                self._properties = self.taskqueue.get_task(id=self.id)._properties
            self._description = base64.b64decode(self._properties.get('payloadBase64', b'')).decode("ascii")
        return self._description