import turtle
wn = turtle.Screen()
wn.bgcolor("lightgreen")
tess = turtle.Turtle()
tess.shape("turtle")
tess.color("blue")

tess.penup()                # This is new
size = 20
for i in range(30):
   tess.stamp()             # Leave an impression on the canvas
   size = size + 3          # Increase the size on every iteration
   tess.forward(size)       # Move tess along
   tess.right(24)           #  ...  and turn her

wn.mainloop()

The turtle has a lot more power than we’ve seen so far. The full documentation can be found athttp://docs.python.org/py3k/library/turtle.htmlor within PyScripter, useHelpand search for the turtle module.

Here are a couple of new tricks for our turtles:

• We can get a turtle to display text on the canvas at the turtle’s current position. The method to do that isalex.write("Hello").
• We can fill a shape (circle, semicircle, triangle, etc.) with a color. It is a two-step process. First we call the methodalex.begin_fill(), then we draw the shape, then we callalex.end_fill().
• We’ve previously set the color of our turtle — we can now also set its fill color, which need not be the same as the turtle and the pen color. We usealex.color("blue","red")to set the turtle to draw in blue, and fill in red.

def draw_bar(t, height):
    """ Get turtle t to draw one bar, of height. """
    t.begin_fill()           # Added this line
    t.left(90)
    t.forward(height)
    t.write("  "+ str(height))
    t.right(90)
    t.forward(40)
    t.right(90)
    t.forward(height)
    t.left(90)
    t.end_fill()             # Added this line
    t.forward(10)

wn = turtle.Screen()         # Set up the window and its attributes
wn.bgcolor("lightgreen")

tess = turtle.Turtle()       # Create tess and set some attributes
tess.color("blue", "red")
tess.pensize(3)

xs = [48,117,200,240,160,260,220]

for a in xs:
    draw_bar(tess, a)

wn.mainloop()

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