时钟的打印
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打印时钟：
import turtle
def draw_spiral(t, n, length=3, a=0.1, b=0.0002):
#Draws an Archimedian spiral starting at the origin
theta = 0.0
for i in range(n):
t.fd(length)
dtheta = 1 / (a + b * theta)
t.lt(dtheta)
theta += dtheta
#create the world and bob
bob = turtle.Turtle()
draw_spiral(bob, n=1000)
turtle.mainloop()
花的打印
打印花：
import turtle
def polyline(t, n, length, angle):
#Draws n line segments
for i in range(n):
t.fd(length)
t.lt(angle)
def arc(t, r, angle):
#Draws an arc with given radius and angle
arc_length = 2 * math.pi * r * abs(angle) / 360
n = int(arc_length / 4) + 3
step_length = arc_length / n
step_angle = float(angle) / n
t.lt(step_angle/2)
polyline(t, n, step_length, step_angle)
t.rt(step_angle/2)
def petal(t, r, angle):
#Draws a petal using two arcs.
for i in range(2):
arc(t, r, angle)
t.lt(180 - angle)
def flower(t, n, r, angle):
#Draws a flower with n petals
for i in range(n):
petal(t, r, angle)
t.lt(360.0/n)
def move(t, length):
#Move turtle(t) forwoard (length) units without leaving a trail
t.pu()
t.fd(length)
t.pd()
bob = turtle.Turtle()
#draw a sequence of three flowers
move(bob, -100)
flower(bob, 7, 60.0, 60.0)
move(bob, 100)
flower(bob, 10, 40.0, 80.0)
move(bob, 100)
flower(bob, 20, 140.0, 20.0)
bob.hideturtle()
turtle.mainloop()
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