nested

Grab a pencil. Sketch what you think this code will draw, then run it and compare.

Here’s some Python turtle code. Before you run it, read it carefully. Can you guess what it will draw?

Beep is thinking hard about this code. What picture will the turtle make? Make a guess, then try it!

Here’s some Python turtle code. Before you run it, read it carefully. Can you guess what it will draw?

Here’s some Python turtle code. Before you run it, read it carefully. Can you guess what it will draw?

Grab a pencil. Sketch what you think this code will draw, then run it and compare.

Beep is thinking hard about this code. What picture will the turtle make? Make a guess, then try it!

Pixel bets you can’t guess what this draws. Prove Pixel wrong!

Beep is thinking hard about this code. What picture will the turtle make? Make a guess, then try it!

Beep is thinking hard about this code. What picture will the turtle make? Make a guess, then try it!

Real programmers read code and imagine what it will do. That’s called tracing. Have a go!

Beep is thinking hard about this code. What picture will the turtle make? Make a guess, then try it!