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Review Checklist

Page Maps

graph LR
  family["Python Programming"]
  program["Python Object-Oriented Programming"]
  section["Reference"]
  page["Review Checklist"]
  capstone["Capstone evidence"]

  family --> program --> section --> page
  page -.applies in.-> capstone
flowchart LR
  orient["Orient on the page map"] --> read["Read the main claim and examples"]
  read --> inspect["Inspect the related code, proof, or capstone surface"]
  inspect --> verify["Run or review the verification path"]
  verify --> apply["Apply the idea back to the module and capstone"]

Read the first diagram as a lookup map: this page is part of the review shelf, not a first-read narrative. Read the second diagram as the reference rhythm: arrive with a concrete ambiguity, compare the current work against the boundary on the page, then turn that comparison into a decision.

Use this checklist when reviewing any object-oriented design in the course or the capstone. The point is not to reward “more classes.” The point is to decide whether the current object boundary earns its existence.

Semantics

  • Is this object primarily a value, an entity, an aggregate, a policy, an adapter, or a facade?
  • Would another engineer describe its role the same way after reading one file?
  • Does the name reflect the contract, not just the implementation detail?

Ownership

  • Which invariant does this object own directly?
  • Which state is authoritative here, and which state is only derived or cached?
  • Which behavior belongs here, and which should move to orchestration or another object?

Mutation and lifecycle

  • Does the public API make legal transitions easier than illegal ones?
  • Are invalid states blocked at construction or transition time instead of tolerated silently?
  • Does the object expose mutation only where the ownership boundary justifies it?

Collaboration

  • Does this object depend on abstractions that match its role, or does it reach across layers?
  • Would composition express this relationship more honestly than inheritance?
  • If this object emits events or calls adapters, does it still preserve a clear source of truth?

Evolution

  • What would have to change if a new behavior were added tomorrow?
  • Which callers would break if this object’s representation changed?
  • Does the object keep compatibility pressure local, or does it widen ripple effects?

Keep, split, or redesign signals

  • keep the object if one ownership story still explains its invariants, mutation, and public contract cleanly
  • split the object if two different authorities are hiding behind one convenient class name
  • redesign the boundary if callers must know private sequencing, cleanup, or storage details to use it safely

Evidence to ask for before you accept the design

  • which capstone file or module example shows this role clearly
  • which test or saved route would fail first if this ownership claim stopped being true
  • which neighboring boundary should stay simpler because this object is carrying the right burden