用Python编个海龟赛跑小程序

源代码：

#!/bin/python3
from turtle import *
from random import randint

speed(100)

penup()
goto(-140,140)
for step in range(15):
  write(step,align="center")
  right(90)
  forward(10)
  pendown()
  trigger = -1
  for step2 in range(15):
    trigger = trigger * -1
    if trigger == 1:
      pendown()
    else:
      penup()
    forward(10)
  penup()
  backward(160)
  left(90)
  forward(20)

#ada the red turtle  
ada = Turtle()
ada.color('red')
ada.shape('turtle')

ada.penup()
ada.goto(-160, 100)
ada.pendown()


# bob the blue turtle
bob = Turtle()
bob.color('blue')
bob.shape('turtle')

bob.penup()
bob.goto(-160, 70)
bob.pendown()

# carl the yellow turtle
carl = Turtle()
carl.color('yellow')
carl.shape('turtle')

carl.penup()
carl.goto(-160, 40)
carl.pendown()

# david the green turtle
david = Turtle()
david.color('green')
david.shape('turtle')

david.penup()
david.goto(-160, 10)
david.pendown()

for turn in range(10):
  ada.right(36)
  bob.right(36)
  carl.right(36)
  david.right(36)

for turn in range(100):
  ada.forward(randint(1,5))
  bob.forward(randint(1,5))
  carl.forward(randint(1,5))
  david.forward(randint(1,5))  

效果图：