import turtle

t1 = turtle.Turtle()     # create an instance of Turtle, assign it to tom
t1.shape("turtle")       # set turtle t1's shape.
                         # Available shape: “arrow”, “turtle”, “circle”, “square”, “triangle”, “classic”

wn = turtle.Screen()                # create window for turtle t1 to draw
wn.bgcolor("lightblue")             # set background color of the window

# Speed settings can be set
# between 1 (slowest) to 10 (fastest).
# But if we set the speed to 0,
# it has a special meaning
# — turn off animation and go as fast as possible.
t1.speed(0)

for i in range(50):
    t1.circle(i*3)       # draw a circle with given radius
    t1.left(10)

wn.mainloop()            # wait for user to close the window