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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 get_cached_moderated_reddits(self):
 """Return a cached dictionary of the user's moderated reddits. This list is used internally. Consider using the `get_my_moderation` function instead. """

        if self._mod_subs is None:
            self._mod_subs = {'mod': self.reddit_session.get_subreddit('mod')}
            for sub in self.reddit_session.get_my_moderation(limit=None):
                self._mod_subs[six.text_type(sub).lower()] = sub
        return self._mod_subs