Reply to Tweet with Tweepy - Python

Just posting the solution so no someone else suffers the way I did. Twitter updated the API and added an option named auto_populate_reply_metadata

All you need to do is set that to true, and the leave the rest as should be. Here is a sample:

api.update_status(status = 'your reply', in_reply_to_status_id = tweetid , auto_populate_reply_metadata=True)

Also, the status_id is the long set of digits at the end of the tweet URL. Good Luck!

I ran into the same problem, but luckily I found the solution. You just need to include the user's screen_name in the tweet:

api.update_status('@<username> My status update', tweetId)