Syllabus Lesson 136 of 141 · Ten doors and the field kit
Ten doors and the field kit

Your change, pair by pair

Why it matters You took four problems alone at the start and four matched ones now. This is the only place in the course where you see your own before and after, measured on your own work.

The lab kit's creative.exam reads this browser's history: whether you passed each exam, how many times you pressed Check, and the minutes from first opening it to first passing. exam.report() returns one row per matched pair, and exam.summary(rows) adds them up.

from creative import exam
rows = exam.report()
rows[0]
# {'baseline': {'lesson': 'c-blind-start/baseline-dedupe', 'passed': True, 'checks': 7, 'minutes': 42.0},
#  'final':    {'lesson': 'c-capstone/final-dedupe', 'passed': True, 'checks': 2, 'minutes': 19.0}}

Read it honestly

The minutes are only as honest as the clock: a lesson left open over lunch looks slow. Checks are a better signal of how sure you were before pressing. And four pairs is a small sample. Treat the result as a mirror, not a score: did you spot the fact in the statement sooner? Did you reach for the same first move?

Everything here stays in this browser. If you did the exams on another device, the history is there, not here.

Recap Solved, checks and minutes, pair by pair. Look for what changed in how you worked, not only in the totals.

Your turn

Write compare_pair(row) for one row of exam.report(). Return a dict with: "skill", the last word of the baseline lesson id ("dedupe", "schedule", "limiter" or "bug"); "solved", "better" if only the final was passed, "worse" if only the baseline was, otherwise "same"; "checks_change", final checks minus baseline checks; "minutes_change", final minutes minus baseline minutes rounded to one decimal place, or None if either is None. Then print one line per pair (any format that includes the skill), and finally the line Solved: B of 4 before, F of 4 after with the numbers from exam.summary(rows). Last, read your lines and set noticed to one sentence (six words or more) on what changed in how you worked: no number can say that for you. This lesson needs the final exams done in this browser.

Spotted a problem in this lesson? Report it · Ask about this lesson

This exercise opens soon

Finish the lesson before it and this one unlocks. The whole course is free, no account needed, and you can read this lesson right now.

Start at lesson 1 Back to syllabus