Teach Your Kids To Code: A Parent-friendly Guide to Python Programming

24 Chapter 2

Always willing to help make my programs more awesome, Alex

asked for one more change: what if we replaced the line segments

with circles now? Wouldn’t that be the coolest picture of all? Well,

yes, I have to agree—it is even cooler. Here’s the full code.

ColorCircleSpiral.py

import turtle

t = turtle.Pen()

turtle.bgcolor("black")

colors = ["red", "yellow", "blue", "green"]

for x in range(100):

t.pencolor(colors[x%4])

t.circle(x)

t.left(91)

You can see the result in Figure 2 -7.

Figure 2-7: Alex’s awesome color circle spiral—

eight lines of code, simple and elegant

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