@Rashmi: Actually it turns out that the incorrect comment you show is not in the current version of the Week 3 Planar Data Assignment notebook. It is only present in the old version of the course. So you must have copied the code from a notebook that was from the previous version of the course. Quite a few things changed when they issued new versions of all these courses in April 2021. If you are bringing saved work forward from before that date, you need to be very careful to study the differences between the old and new notebooks and not just blindly copy things over.