📊 Week 4 Kickoff Slides

The slide deck used in the Week 4 in-class kickoff session. The deck covers: welcome back + recap, the live quiz, chapter-by-chapter tour (Ch1-Ch10), 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_4__presentation.pdf

What's in it

Slides 1-5 : Welcome back, the "From Tables to Insights" theme, today's agenda (split first half / second half).
§1 Live Quiz Round 1 : 10 recognition-level questions covering Ch1-Ch5 (DataFrames, Filtering, Groupby, Joins, Strings and Dates).
§2 Chapter Tour: Ch1-Ch5 : Ch1 (info() vs describe() for schema inspection), Ch2 (boolean masks, loc vs iloc), Ch3 (groupby named aggregations, count vs size), Ch4 (the join-explosion pattern, duplicate key deduplication), Ch5 (.str and .dt accessors, pd.to_datetime(errors="coerce")). Each chapter slide carries a 📦 Run along: pointer to its assets/companion_chN_*.py script.
§3 Live Exercise A : exercise options table + starter code + try-it task for the recommended exercise (Ex 3: Groupby and Aggregation).
§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 Ch6-Ch10.
§6 Chapter Tour: Ch6-Ch10 : Ch6 (pivot_table vs melt, rolling, apply vs built-ins), Ch7 (CSV vs Parquet, Parquet round-trip), Ch8 (visualization as validation, saved chart artifacts), Ch9 (three signals to leave Pandas: RAM, profiled runtime, parallel cores), Ch10 (notebooks for exploration, scripts for production).
§7 Live Exercise B : exercise options table + output-format and round-trip checks for the recommended exercise (Ex 5: Reshape and Export).
§8 Concept Deep-Dive : responsive to the agenda card; default fallbacks are "SettingWithCopyWarning and when .copy() is needed" (Gotchas) + "count vs size in groupby" (Ch3).
§9 Assignment Launch : the MessyCorp pipeline rebuild mission, the chapter-to-task mapping table, the messy messy_sales.csv walk-through with deliberate problems.
§10 🖊️ Hand-written Closer : 10-min on-paper diagnostic walkthrough of a join explosion that inflated the customer summary report 3×.

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_4__14_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 five exercises:

Section	Exercise	Codespace folder
§3 Live Exercise A (recommended)	Ex 3: Groupby and Aggregation	`data-track/week-4/exercise_3/`
§3 Live Exercise A (alternative)	Ex 2: Filtering and Sorting	`data-track/week-4/exercise_2/`
§7 Live Exercise B (recommended)	Ex 5: Reshape and Export	`data-track/week-4/exercise_5/`
§7 Live Exercise B (alternative)	Ex 4: Joining Two Tables	`data-track/week-4/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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