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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_channels(self):
 """ Access the task_channels :returns: twilio.rest.taskrouter.v1.workspace.task_channel.TaskChannelList :rtype: twilio.rest.taskrouter.v1.workspace.task_channel.TaskChannelList """

        if self._task_channels is None:
            self._task_channels = TaskChannelList(self._version, workspace_sid=self._solution['sid'], )
        return self._task_channels