Functions: There’s a Name for That 151

The final piece will be our for loop to generate 50 random

locations for the smiley faces and call the draw_smiley() function

to draw each face. It will look like this:

for n in range(50):

x = random.randrange(-turtle.window_width()//2,

turtle.window_width()//2)

y = random.randrange(-turtle.window_height()//2,

turtle.window_height()//2)

draw_smiley(x,y)

Our random x- and y-coordinate values are just like those we

saw in Chapter 6, generating random points from the left half to the

right half of the screen, and from the bottom half to the top half.

With draw_smiley(x,y), we’re passing these random coordinates as

arguments to the draw_smiley() function, which will draw a smiley

at that random spot.

Putting It All Together

Put the program together, and it looks something like this:

RandomSmileys.py

import random
import turtle
t = turtle.Pen()
t.speed(0)
t.hideturtle()
turtle.bgcolor("black")
u def draw_smiley(x,y):
t.penup()
t.setpos(x,y)
t.pendown()

Head

t.pencolor("yellow")
t.fillcolor("yellow")
t.begin_fill()
t.circle(50)
t.end_fill()

Left eye

t.setpos(x-15, y+60)
t.fillcolor("blue")
t.begin_fill()
t.circle(10)
t.end_fill()