Basic drawing with Python's turtle module

gistfile1.txt

import turtle
import random

# input:  takes a side and a length as integers
# processing:  draws a figure based on the inputs
# output:  nothing, dones't return any value
def polygon(sides, length):

    for x in range(sides):

        turtle.forward(length)
        turtle.right(360/sides)

turtle.title("My Turtle")
turtle.setup(1000, 1000, 0, 0)

# start off with a square of 50 pixels
size = 200

# start off at -150, 150
xpos = -150
ypos = 150

# start off with a very red color
green = 1.0

# draw as fast as possible! (the default is 10)
turtle.speed(0)

# for "instant" drawing, uncomment:
#turtle.tracer(0)

for x in range(10):

    # move to our desired location
    turtle.penup()
    turtle.goto(xpos, ypos)
    turtle.pendown()

    # draw our polygon
    turtle.pencolor(0,green,0)
    turtle.fillcolor(0, green, 0)
    turtle.begin_fill()
    polygon(4, size)
    turtle.end_fill()

    # change pos
    xpos += 10
    ypos -= 10

    # decrease green
    green -= 0.1

    # decrease the size
    size -= 20

# for "instant" drawing, uncomment:
#turtle.update()

turtle.exitonclick()