Return the value of an attribute in MongoDB

Question

I have a collection in MongoDB named (Emotion), it has 13 documents and one of the attributes of the document is (maxEmotion)

I'm using Python, I want to return all the values of that attribute, so at the end I will have 13 results.

I've tried:

emotions = db.Emotion.distinct("maxEmotion")

But I didn't get the correct results.

This is a picture from the collection:

Thank you.