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

Loops Are Fun (You Can Say That Again) 59

and w six times each. At v, we’re still drawing a circle with a

radius of 100. At w, though, we’re turning only 60 degrees each

turn, or one-sixth of 360 degrees, so we get six circles around the

center of the screen this time, as shown in Figure 4-2.

Figure 4-2: A rosette of six circles

The rosette with six circles is even prettier than the one with

four circles, and thanks to our for loop, we didn’t have to write

any more lines of code to get six circles than we did to get four—we

just changed two numbers! Because we varied those two numbers,

you may be tempted to replace them with a variable. Let’s give in

to that temptation. Let’s give the user the power to draw a rosette

with any number of circles.

i proving m our rosette program

with user input

In this section, we’ll use the turtle.numinput() function that we

saw in Chapter 3 (see ColorSpiralInput.py on page 47) to write

a program that asks the user to enter a number and then draws a

rosette with that number of circles. We’ll set the user’s number as

the size of our range() constructor. Then, all we have to do is divide