Best afterNumbers have types: int vs float

Converting a float to an int

Turning a decimal into a whole number sounds like rounding — but Python's int() doesn't round. Watch 3.9 become two different whole numbers depending on which function you reach for.

Round the measurement 3.9 to a whole number (we want 4).

int() truncates, it doesn't round execution-derived · CPython

variables

state after line 1 runs

variable	value
`measurement`	`3.9`

step 1 / 2

Click a line, drag the slider, or use the ← → keys.

What you are looking at

Watch rounded — does 3.9 become 3 or 4?

Buggy — rounded = int(3.9) gives 3. int() truncates — it chops the fractional part off rather than rounding to the nearest.
Procedural — rounded = round(3.9) gives 4. When you actually want rounding, round() is the tool.

Every state you see came from running the program under CPython's tracer at build time — see how GlassBox stays honest.