Mastery Map¶

Page Maps¶

graph LR
  family["Python Programming"]
  program["Python Object-Oriented Programming"]
  section["Orientation"]
  page["Mastery Map"]
  capstone["Capstone evidence"]

  family --> program --> section --> page
  page -.applies in.-> capstone

flowchart LR
  judgment["Turn design intuition into judgment"] --> proof["Choose proof that matches the claim"]
  proof --> boundary["Mark what is public, internal, and operationally risky"]
  boundary --> review["Review the whole system under real pressure"]
  review --> decision["Leave with one defensible keep or change decision"]

Use this map when the question is no longer "can I model this object?" but "can I defend this design to another engineer, keep it healthy under change, and know what evidence is strong enough to trust it?" The final stretch of the course is about stewardship, not feature accumulation.

What mastery means here¶

Mastery in this course does not mean collecting the most patterns or the most Python tricks. It means you can do three hard things repeatedly:

choose evidence that matches the strength of the claim
decide what should be public, internal, extensible, or unsupported
review the design under operational pressure without flattering yourself

These are the skills that distinguish "I can write objects" from "I can steward a system."

Read modules 8 to 10 as one stewardship sequence¶

Module	Main question	Late-course trap it prevents	What you should be able to say afterward
Module 8: testing, contracts, verification depth	what proof is honest for this claim	using heavy proof everywhere or weak proof for serious claims	"I know the first honest route and why stronger routes are unnecessary or necessary."
Module 9: public APIs and extension governance	what others may safely rely on	exposing convenience internals and calling them supported later	"I know what is public, what is internal, and what support promise each choice implies."
Module 10: performance, observability, security, capstone review	can this design survive real operational pressure	treating operations, trust, and performance as bolt-on concerns	"I can name one real risk, the signal that reveals it, and the judgment it forces."

Module 8: make proof proportionate¶

Module 8 is where confidence stops being emotional and becomes reviewable. The main question is not "do we have tests?" It is:

what claim are we making?
what is the first honest route that can test it?
which stronger route would be wasteful, and which weaker route would be misleading?

Stay here until you can explain why one route is right and another one is wrong. That is stronger evidence of mastery than any raw test count.

Module 9: govern public dependence deliberately¶

Module 9 matters because systems become fragile when every useful seam quietly becomes a supported contract. This module teaches deliberate permission.

Keep asking:

which names, modules, behaviors, and protocols are intentionally public?
which customization seam is narrow enough to support without exposing internals?
which compatibility promise must be visible before change pressure arrives?

If your answer is "we can always clean it up later," the governance decision is not yet made.

Module 10: review the whole design under operational pressure¶

Module 10 brings the course together. It is not just a performance chapter and not just a security chapter. It is a system judgment chapter.

Ask:

what should be measured before optimized?
which signals would reveal ownership drift in production?
where are the trust boundaries, serialization hazards, or operational weak points?
which current design choice is acceptable today but dangerous under extension pressure?

The point is to leave with explicit review judgment, not with a vague feeling that the design is "good enough."

A strong final-pass route for independent learners¶

Finish Module 8 and write one sentence beginning with The first honest evidence is....
Finish Module 9 and write one sentence beginning with The supported public boundary is....
Finish Module 10 and write one sentence beginning with The operational risk I would watch first is....
Use the capstone review surfaces to defend one keep decision and one change decision.

This final-pass route turns understanding into judgment you can actually communicate.

Best capstone checks for this stage¶

Module	Best first capstone surface	Why
Module 8	verification bundle, walkthrough bundle, proof guide	they show how evidence strength changes with claim scope
Module 9	`application.py`, public tests, extension guidance	they expose what others might depend on and what should stay private
Module 10	review worksheet, saved bundles, architecture surfaces	they force a whole-system judgment with named evidence

Late-course traps¶

treating mocks or helper assertions as proof of architecture by default
exposing an internal helper because it feels useful today
optimizing before naming the hot path or the user-facing cost
calling the design secure because tests pass
assuming observability is only about process health rather than object-model drift

Signs you are ready to leave the course¶

You are ready to leave the course only when you can do all of these without hand-waving:

defend a proof route as proportionate to the claim
mark a boundary public or internal with reasons and support implications
name one operational, performance, or trust risk and the evidence that would reveal it

Exit check¶

Leave this map only when you can say:

The current judgment I need to make is ____, the evidence I would show first is ____, and the boundary or risk I can now defend is ____.