Python Groupby Adjacent Runs Sequence

Inputs: [Python version], [input sequence], [key function]. Explain itertools.groupby as grouping consecutive equal keys rather than all equal keys globally. Use the sequence A,A,B,A as a minimal fixture. Materialize each group before advancing, contrast with a deliberately sorted copy, and explain that sorting changes order. Produce a 12-second token animation drawing boundaries around adjacent runs without merging separated As. Adapt the presentation to [audience] and [tone]. End with a concrete check of the defining task detail against the inputs.

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.