Warm-up: Spot the Bug — the lookup loop that returns the wrong
record as soon as two people share a first name
The problem of the day: The Wrong Container — a tally a plain
list handles badly, and one deletion that quietly corrupts it. A
diagnostic, not a test: what this room reaches for first is what
tells me where the unit has to begin.
Invent the notation: the room writes on the board how it wishes it
could ask for one person’s count
Park it deliberately. Nothing gets named today; you need the idea
before the idea gets a word.
Things to do before our next class
Journal: the exact line where your two lists stopped agreeing.
Bring your board notation written out — we compare it against
Python’s next class.