编写一个利用python turtle库的贪吃蛇游戏

Python的turtle库是一个绘图库，可以用来创建简单的图形和动画。下面是一个使用turtle库编写的贪吃蛇游戏的示例代码：

import turtle
import time
import random

delay = 0.1

# 创建窗口
win = turtle.Screen()
win.title("贪吃蛇游戏")
win.bgcolor("black")
win.setup(width=600, height=600)
win.tracer(0)

# 创建蛇头
head = turtle.Turtle()
head.speed(0)
head.shape("square")
head.color("white")
head.penup()
head.goto(0, 0)
head.direction = "Stop"

# 创建食物
food = turtle.Turtle()
food.speed(0)
food.shape("circle")
food.color("red")
food.penup()
food.goto(0, 100)

segments = []

# 控制蛇头移动的函数
def go_up():
    if head.direction != "down":
        head.direction = "up"

def go_down():
    if head.direction != "up":
        head.direction = "down"

def go_left():
    if head.direction != "right":
        head.direction = "left"

def go_right():
    if head.direction != "left":
        head.direction = "right"

def move():
    if head.direction == "up":
        y = head.ycor()
        head.sety(y + 20)

    if head.direction == "down":
        y = head.ycor()
        head.sety(y - 20)

    if head.direction == "left":
        x = head.xcor()
        head.setx(x - 20)

    if head.direction == "right":
        x = head.xcor()
        head.setx(x + 20)

# 键盘绑定
win.listen()
win.onkeypress(go_up, "w")
win.onkeypress(go_down, "s")
win.onkeypress(go_left, "a")
win.onkeypress(go_right, "d")

# 游戏循环
while True:
    win.update()

    # 检测碰撞边界
    if head.xcor()>290 or head.xcor()<-290 or head.ycor()>290 or head.ycor()<-290:
        time.sleep(1)
        head.goto(0, 0)
        head.direction = "Stop"

        # 隐藏segments
        for segment in segments:
            segment.goto(1000, 1000)

        # 清空segments列表
        segments.clear()

    # 检测碰撞食物
    if head.distance(food) < 20:
        x = random.randint(-290, 290)
        y = random.randint(-290, 290)
        food.goto(x, y)

        # 添加新的segments
        new_segment = turtle.Turtle()
        new_segment.speed(0)
        new_segment.shape("square")
        new_segment.color("grey")
        new_segment.penup()
        segments.append(new_segment)

    # 移动segments
    for index in range(len(segments)-1, 0, -1):
        x = segments[index-1].xcor()
        y = segments[index-1].ycor()
        segments[index].goto(x, y)

    if len(segments) > 0:
        x = head.xcor()
        y = head.ycor()
        segments[0].goto(x, y)

    move()

    # 检测碰撞自身
    for segment in segments:
        if segment.distance(head) < 20:
            time.sleep(1)
            head.goto(0, 0)
            head.direction = "Stop"

            # 隐藏segments
            for segment in segments:
                segment.goto(1000, 1000)

            # 清空segments列表
            segments.clear()

    time.sleep(delay)

# 关闭窗口
win.mainloop()

这个示例代码使用turtle库创建了一个简单的贪吃蛇游戏。你可以使用WASD键来控制蛇头的移动方向，目标是吃到食物并避免碰到边界或自身。游戏会根据你的操作进行更新，并在碰撞发生时结束游戏。