nested

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!

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!

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

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

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?

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

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

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

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