Lesson 11 · Python Final Project — Knowledge ChecksAnswer key

You're about to build a 60-block-worth Python program. What's the smartest way to start?

1. A.Write the whole thing, then run it once at the end
2. B.Write and test one small function at a time, then combine them✓
3. C.Copy a classmate’s program
4. D.Skip planning and improvise

Build and test in small pieces (unit testing), then integrate. It's far easier to find a bug in one small function than in a giant program.

Your program runs but the robot behaves differently each time on the same code. Most likely cause?

1. A.A syntax error
2. B.Physical factors — wheel slip, surface, or battery level✓
3. C.The function names are wrong
4. D.Python is broken

If the code is unchanged and the result varies, it's usually physics — grippier surface, fresher battery, or wheel slip — not a code bug.