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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 task_actions(self):
 """ Access the task_actions :returns: twilio.rest.autopilot.v1.assistant.task.task_actions.TaskActionsList :rtype: twilio.rest.autopilot.v1.assistant.task.task_actions.TaskActionsList """

        if self._task_actions is None:
            self._task_actions = TaskActionsList(
                self._version,
                assistant_sid=self._solution['assistant_sid'],
                task_sid=self._solution['sid'],
            )
        return self._task_actions