from models import Notebook, TextNote, VideoNote bio = Notebook("Bio 201 Notes") bio.notes.append(TextNote("This is the first day of Bio 201")) bio.notes.append(TextNote("Final exam is 95%.")) bio.notes.append(VideoNote("https://www.youtube.com/watch?v=PKffm2uI4dk")) bio.display() bio.save("bio201.txt") bio.load("bio201.txt") print(bio.to_json())