实例8：科赫雪花小包裹

#我的代码
 1 import turtle
 2 def koch(size, n):
 3     if n == 0:
 4         turtle.fd(size)
 5     else:
 6         for angle in [0, 60, -120, 60]:
 7            turtle.left(angle)
 8            koch(size/3, n-1)
 9 
10 def main(level):
11     turtle.setup(600,600)
12     turtle.penup()
13     turtle.goto(-200, 100)
14     turtle.pendown()
15     turtle.pensize(2)
16     koch(400, level)
17     turtle.hideturtle()
18     turtle.done()
19     
20 try:
21     level = eval(input("请输入科赫曲线的阶: "))
22     main(level)
23 except:
24     print("输入错误")

 1 import turtle
 2 def koch(size, n):
 3     if n == 0:
 4         turtle.fd(size)
 5     else:
 6         for angle in [0, 60, -120, 60]:
 7            turtle.left(angle)
 8            koch(size/3, n-1)
 9 
10 def main(level):
11     turtle.setup(600,600)
12     turtle.penup()
13     turtle.goto(-200, 100)
14     turtle.pendown()
15     turtle.pensize(2)
16     koch(400,level)     
17     turtle.right(120)
18     koch(400,level)
19     turtle.right(120)
20     koch(400,level)
21     turtle.hideturtle()
22 
23 try:
24     level = eval(input("请输入科赫曲线的阶: "))
25     main(level)
26 except:
27     print("输入错误")