Python Fromkeys Shared Values Motion Study

Create a 12-second educational animation from [verified dictionary trace]. Two key cards point to one list container; append one token through the first key and highlight that both references reach it. Then show an explicitly separate construction with independent lists. Do not depict copying during a read. Keep code overlays and value counts synchronized.

Confirm required reference images and timing inputs are present before generating. Keep objects, identities, spatial relationships and light direction consistent. Render the clip when video generation is supported; otherwise supply a timed shot list, reference checklist and generation-ready prompt, labeled as a production plan. Do not claim rendered output without an actual file. Check the opening, transition and final frame against the stated counts and geometry.