📊 Week 3 Kickoff Slides

The slide deck used in the Week 3 in-class kickoff session. The deck covers: welcome back + recap, the live quiz, chapter-by-chapter tour (Ch1-6), two live exercises from the practice chapter, the agenda card, the assignment scaffold tour, and the closing hand-written reflection.

<aside> 💡 Use this as a recap. If you missed class or want to re-walk the agenda, the deck mirrors the structure of the lesson: same section numbers, same order. Especially useful for the assignment-launch walk-through (§9) when you start the assignment at home.

</aside>

Download

week_3__presentation.pdf

What's in it

Slides 1-5 : Welcome back, the "From Local to the Real World" theme, today's agenda (split first half / second half).
§1 Live Quiz Round 1 : 10 recognition-level questions covering Ch1-Ch4 (Intro to Ingestion, Ingesting from APIs, Production Error Handling, Reading File Formats).
§2 Chapter Tour: Ch1-Ch3 : Ch1 (ingestion flow + the Broken Ingestion Script), Ch2 (timeout + raise_for_status), Ch3 (transient vs permanent + the canonical retry loop).
§3 Live Exercise A : exercise options table + starter code + live-test instructions for the recommended exercise (Ex 1: Write a Retry Function).
§4 Agenda Card : flag what felt shaky on the read via our Live Q&A site. Drives the §8 Deep-Dive after the break.
☕ Break.
§5 Live Quiz Round 2 : 10 application-level questions covering Ch5-Ch6 + the Week 3 gotchas (Pydantic, SQLite, JSON decode, DB locked, naive vs aware timestamps).
§6 Chapter Tour: Ch4-Ch6 : Ch4 (CSV / JSON / Parquet trade-offs + canonical shape), Ch5 (Pydantic BaseModel + Field + @field_validator), Ch6 (parameterised queries + UNIQUE + ON CONFLICT DO UPDATE).
§7 Live Exercise B : exercise options table + the SQLite idempotency demo (insert → fail → upsert → still 3 rows) for the recommended exercise (Ex 5: SQLite Writer).
§8 Concept Deep-Dive : responsive to the agenda card; default fallbacks are "why ? placeholders prevent injection" (Ch6) + "Pydantic coercion vs strict mode" (Ch5).
§9 Assignment Launch : the DataBridge Inc. pipeline mission, the chapter-to-task mapping table, the messy weather_stations.csv walk-through with 7 deliberate problems.
§10 Career Relevance + Q&A : NL data-job market role-frequency framing (DE / AE / DS / DA), the recruiter-keyword CV line, Week 4 preview.
§11 🖊️ Hand-written Closer : 10-min on-paper response to a tech-lead question about how to handle a 503 that stopped the nightly run halfway.

The slides are deliberately student-facing only. The teacher's per-section script (pacing, quiz answer cribs with common-wrong-pick analysis, exercise reference solutions, deep-dive default topics, closer rubric) lives in the GitHub-only week_3__lesson_plan.md (visible on GitHub only; not synced to Notion, so no link from this page).

Practice exercises (referenced in the live exercise slides)

The two live exercises the deck showcases come from the Learning-Resources repo. One Codespace covers all six exercises:

Section	Exercise	Codespace folder
§3 Live Exercise A (recommended)	Ex 1: Write a Retry Function	`data-track/week-3/exercise_1/`
§3 Live Exercise A (alternative)	Ex 2: Paginated API Fetch	`data-track/week-3/exercise_2/`
§7 Live Exercise B (recommended)	Ex 5: SQLite Writer	`data-track/week-3/exercise_5/`
§7 Live Exercise B (alternative)	Ex 4: Pydantic Validation	`data-track/week-3/exercise_4/`

The teacher chooses which to run live based on quiz wrong-pick patterns. Solutions live in each exercise_N/solutions/ folder, with # WHY ...: commentary under every non-obvious choice: read the reasoning, do not copy the code verbatim.

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