def on_timeline(self, tweet, prefix):
        """
        Defines actions to take on a timeline tweet.

        tweet - a tweepy.Status object. You can access the text with
        tweet.text

        prefix - the @-mentions for this reply. No need to include this in the
        reply string; it's provided so you can use it to make sure the value
        you return is within the 140 character limit with this.

        It's up to you to ensure that the prefix and tweet are less than 140
        characters.

        When calling post_tweet, you MUST include reply_to=tweet, or
        Twitter won't count it as a reply.
        """
        if tweet.text.lower() in 'wanna hear u echo':
            self.post_tweet(prefix + ' ECHO (ECHO) ECHO (ECHO)', reply_to=tweet)
dataset/ETHPy150Open thricedotted/twitterbot/examples/echobot/echobot.py/EchoBot.on_timeline/swapped operands of `in`