请用python写一个完整的可以跑起来的贪食蛇小游戏

好的，这是一个 Python 实现的简单的贪吃蛇小游戏：

import turtle
import time
import random

delay = 0.1

# Set up the screen
win = turtle.Screen()
win.title("贪吃蛇")
win.bgcolor("lightgreen")
win.setup(width=600, height=600)
win.tracer(0) # Turns off the screen updates

# Create a snake head
head = turtle.Turtle()
head.speed(0)
head.shape("square")
head.color("black")
head.penup()
head.goto(0,0)
head.direction = "stop"

# Create food for the snake
food = turtle.Turtle()
food.speed(0)
food.shape("circle")
food.color("red")
food.penup()
food.goto(0,100)

# Create the snake's body segments
segments = []

# Move the snake
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)

# Change the snake's direction
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"

# Listen for key presses
win.listen()
win.onkeypress(go_up, "Up")
win.onkeypress(go_down, "Down")
win.onkeypress(go_left, "Left")
win.onkeypress(go_right, "Right")

# Main game loop
while True:
    win.update()

    # Check for collision with the food
    if head.distance(food) < 20:
        # Move the food to a random location
        x = random.randint(-290, 290)
        y = random.randint(-290, 290)
        food.goto(x,y)

        # Add a body segment
        new_segment = turtle.Turtle()
        new_segment.speed(0)
        new_segment.shape("square")
        new_segment.color("grey")
        new_segment.penup()
        segments.append(new_segment)

    # Move the end segments first in reverse order
    for index in range(len(segments)-1, 0, -1):
        x = segments[index-1].xcor()