python用turtle制作一个猫捉老鼠游戏

import turtle

import time

import random

def up():

    jerry.setheading(90)

    jerry.forward(20)

def down():

    jerry.setheading(270)

    jerry.forward(20)

def left():

    jerry.setheading(180)

    jerry.forward(20)

def right():

    jerry.setheading(0)

    jerry.forward(20)

playground=turtle.Screen()

playground.register_shape('D:/pythonlearn/tom.gif')

playground.register_shape('D:/pythonlearn/jerry.gif')

playground.onkey(up,'Up')

playground.onkey(down,'Down')

playground.onkey(left,'Left')

playground.onkey(right,'Right')

#监听

playground.listen()

writer=turtle.Turtle()

writer.color('brown')

writer.hideturtle()

writer.penup()

writer.home()

writer.write("Tom & JERRY",align='center',font=("Comic sans MS",50,"bold"))

writer.goto(0,-50)

writer.write("READY?3,2,1,GO",align='center',font=("Comic sans MS",20,"bold"))

time.sleep(3)

writer.clear()

tom=turtle.Turtle()

tom.shape('D:/pythonlearn/tom.gif')

tom.penup()

tom.goto(random.randint(-200,200),random.randint(-200,200))

tom.pendown()

tom.pensize(3)

tom.color('blue')

jerry=turtle.Turtle()

jerry.shape('D:/pythonlearn/jerry.gif')

jerry.speed(0)

jerry.penup()

jerry.goto(random.randint(-200,200),random.randint(-200,200))

jerry.color('brown')

start=time.time()

while True:

    tom.setheading(tom.towards(jerry))

    tom.forward(5)

    if tom.distance(jerry)<10:

        end=time.time()

        playground.clear()

        jerry.goto(0,0)

        jerry.write("GAME OVER",align='center',font=("Comic sans MS",50,"bold"))

        jerry.goto(0,-50)

        jerry.write("YOU SURVIVED {:.1f} SECONDS".format(end-start),align='center',font=("Comic sans MS",20,"bold"))

        tom.pu()

        tom.goto(-50,-70)

        tom.stamp()

        jerry.pu()

        jerry.goto(50,-70)

        jerry.stamp()

        break