It used to be part by the month. I took the data science nano degree and I finished a lot of it in a month and a half or so. The course wasn't complete and I fe

It used to be part by the month. I took the data science nano degree and I finished a lot of it in a month and a half or so. The course wasn't complete and I felt like I couldn't do the reinforcement learning section based on the class so I dropped it. It was a great deal then.