human
Solve the following python programming problem given the following code:
@ defer.inlineCallbacks 
def count_daily_messages(self) : 
    '
        Returns an estimate of the number of messages sent in the last day.

        If it has been significantly less or more than one day since the last
        call to this function, it will return None.
        ' 
    def _count_messages(txn) : 
        now = self.hs.get_clock ().time () 
        txn.execute ('SELECT reported_stream_token, reported_time FROM stats_reporting') 
        last_reported = self.cursor_to_dict (txn) 
        txn.execute ('SELECT stream_ordering FROM events ORDER BY stream_ordering DESC LIMIT 1') 
        now_reporting = self.cursor_to_dict (txn) 
        if (not now_reporting) : 
            logger.info ('Calculating daily messages skipped.
no now_reporting') 
            return None 
now_reporting = now_reporting [0] ['stream_ordering'] 
        txn.execute ('DELETE FROM stats_reporting') 
        txn.execute ('INSERT INTO stats_reporting (reported_stream_token, reported_time) VALUES (?, ?)', (now_reporting, now)) 
        if (not last_reported) : 
            logger.info ('Calculating daily messages skipped.
no last_reported') 
            return None 
yesterday = (now - ((24 * 60) * 60)) 
        since_yesterday_seconds = (yesterday - last_reported [0] ['reported_time']) 
        any_since_yesterday = (math.fabs (since_yesterday_seconds) > (60 * 60)) 
        if any_since_yesterday : 
            logger.info (('Calculating daily messages skipped.
since_yesterday_seconds: %d' % (since_yesterday_seconds,))) 
            return None 
txn.execute ("SELECT COUNT(*) as messages FROM events NATURAL JOIN event_json WHERE json like '%m.room.message%' AND stream_ordering > ? AND stream_ordering <= ?", (last_reported [0] ['reported_stream_token'], now_reporting)) 
        rows = self.cursor_to_dict (txn) 
        if (not rows) : 
            logger.info ('Calculating daily messages skipped.
messages count missing') 
            return None 
return rows [0] ['messages'] 
ret = (yield self.runInteraction ('count_messages',...

    
    

    Fix the buggy line: ret = (yield self.runInteraction ('count_messages', ret))
assistant
#Here is Python code to fix the buggy line: ret = (yield self.

ret = (yield self.runInteraction ('count_messages', def _count_messages())