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Rainbow dot grid

36 colorful dots arranged in a 6×6 grid — nested loops in action.

Sprout· ages 8–1015 minnested for loopsturtle.dotlist indexing

dot_grid.py

520×520

First load pulls ~10 MB of Python. Only happens once — the browser caches it after.

What should the output look like?

A neat grid of 36 colored dots on the canvas.

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How this works

Two for loops nested inside each other — the outer counts rows, the inner counts columns. For every (row, col) pair we jump the turtle there and draw a dot. The color is picked from a list using (row + col) % 6, which creates a diagonal rainbow pattern.

Your turn — try these

1Change `size = 6` to `size = 10`. What happens?
2Change the color rule to `colors[row % 6]` — now each row is one color.
3Change `turtle.dot(24, ...)` to `turtle.dot(row * 5 + 10, ...)` — dots grow row by row!