Python：龟兔赛跑

以下是Python中实现龟兔赛跑的例子：

# 导入turtle库
from turtle import *
import random

# 设置乌龟和兔子的起始位置
turtle_pos = -300
rabbit_pos = -300

# 创建乌龟和兔子
turtle = Turtle()
turtle.shape('turtle')
turtle.color('green')
turtle.penup()
turtle.goto(turtle_pos, 0)
turtle.pendown()

rabbit = Turtle()
rabbit.shape('turtle')
rabbit.color('red')
rabbit.penup()
rabbit.goto(rabbit_pos, -50)
rabbit.pendown()

# 设置比赛的长度
race_length = 500

# 开始比赛
while turtle_pos < race_length and rabbit_pos < race_length:
    turtle_step = random.randint(1, 20)
    rabbit_step = random.randint(1, 20)

    turtle_pos += turtle_step
    rabbit_pos += rabbit_step

    turtle.goto(turtle_pos, 0)
    rabbit.goto(rabbit_pos, -50)

# 判断比赛结果
if turtle_pos >= race_length and rabbit_pos >= race_length:
    print("It's a tie!")
elif turtle_pos >= race_length:
    print("Turtle wins!")
else:
    print("Rabbit wins!")

# 隐藏乌龟和兔子
turtle.hideturtle()
rabbit.hideturtle()

这个例子使用了Python中的turtle库来创建乌龟和兔子，并使用random库来随机生成它们每次移动的步数。比赛的长度为500，当乌龟或兔子到达终点时，比赛结束并输出结果。