Week 1, Assignment 2, Accidentally Deleted .ipynb

You can also protect yourself by keeping local back up copies. Click “File → Download as notebook (ipynb)”. Note that if you want to be able to refer to the assignments once you complete the course, you definitely want to download copies. The assignments are behind the paywall, meaning that you can no longer see them once you stop paying the subscription, even though you have completed them. There is a topic about this and how to download all the files associated with the assignments on the DLS FAQ Thread.