This online scheme uses embedded Trinkets to present a simplistic IDE for students to write their code. Using an online editor means this scheme will work on any device including Chromebook and iPad. However, it also means that the source code students write will NOT be saved from session to session. To save their work, students will need to copy their work out of the Trinket. Perhaps saving it in Notepad.
If students have a Trinket account, they may be able to save the Trinkets to their own Trinket storage.
We strongly suggest that students copy the boilerplate from the Trinket into a local IDE such as IDLE, Thonny or PyCharm so they are working offline.