【Python贪吃蛇】：编码技巧与游戏设计的完美结合

import turtle
import time
import random
 
# 设置计分
score = 0
high_score = 0
 
# 设置计分板
def set_scoreboard():
    global score
    global high_score
    pen.clear()
    pen.write("Score: {}  High: {}".format(score, high_score), align="center", font=("Courier", 24, "normal"))
 
# 绘制蛇的每一个部分
def draw_snake(snake_positions):
    for position in snake_positions:
        pen.goto(position)
        pen.dot(radius)
 
# 蛇移动的方向
def move_snake(snake_positions, direction):
    # 蛇头的位置依据移动的方向变化
    head = list(snake_positions[0])
    if direction == "up":
        head[1] += radius
    elif direction == "down":
        head[1] -= radius
    elif direction == "left":
        head[0] -= radius
    elif direction == "right":
        head[0] += radius
    new_snake_positions = [head] + snake_positions
    return new_snake_positions
 
# 游戏结束的函数
def game_over():
    global game_is_on
    game_is_on = False
    pen.clear()
    pen.write("Game Over!", align="center", font=("Courier", 40, "normal"))
 
# 主函数
def main():
    global game_is_on
    global radius
    global food_position
    global score
    global high_score
 
    # 设置画笔和计分板
    wn = turtle.Screen()
    pen = turtle.Turtle()
    radius = 20
    pen.speed(0)
    wn.bgcolor("black")
    pen.color("white")
    pen.penup()
 
    # 蛇的初始位置
    snake_positions = [(0, 0), (-20, 0), (-40, 0)]
    direction = "right"
 
    # 食物的随机位置
    food_position = random.randint(-15 * radius, 15 * radius), random.randint(-15 * radius, 15 * radius)
    food_is_ate = False
 
    # 游戏是否开始
    game_is_on = True
 
    # 绘制蛇和食物
    draw_snake(snake_positions)
    pen.goto(food_position)
    pen.dot(radius)
 
    # 监听键盘事件
    wn.listen()
    wn.onkeypress(lambda x: "Up" if direction != "down" else "", "Up")
    wn.onkeypress(lambda x: "Down" if direction != "up" else "", "Down")
    wn.onkeypress(lambda x: "Left" if direction != "right" else "", "Left")
    wn.onkeypress(lambda x: "Right" if direction != "left" else "", "Right")
 
    # 游戏循环
    while game_is_on:
        wn.update()
        time.sleep(0.1)
 
        # 蛇吃食物
        if snake_positions[0][0] - food_position[0] == radius and snake_positions[0][1] - food