python turtle小蟒蛇程序

Python Turtle库中的“小蟒蛇”程序通常是指利用Turtle模块来模拟蛇吃食物的游戏。Turtle是一个绘图模块，通过设置它的前进、转向和绘制功能，我们可以创建动态的图形效果。

在这个游戏中，蛇由一系列相连的矩形或多边形组成，头部移动时会自动连接到身体的其余部分。游戏的基本规则包括蛇移动、蛇头吃到食物增长长度、触碰墙壁或自身的身体导致游戏结束等。玩家通常需要控制蛇的方向（如上、下、左、右），并使用循环和条件判断来处理蛇的行为。

下面是一个简单的Python小蟒蛇游戏的概述：

import turtle
import random

# 初始化游戏变量
snake_speed = 0.1
snake_body = []
food_position = None
direction = "right"

# 创建画布和蛇
turtle.speed(snake_speed)
snake = turtle.Turtle()
snake.shape("square")
snake.penup()

# 设置初始位置和食物
snake_position = [0, 0]
food_position = [random.randint(-300, 300), random.randint(-300, 300)]
snake_length = 3  # 初始长度为3段

def move_snake():
    new_head = snake.pos()
    if direction == "left":
        new_head[0] -= 20
    elif direction == "right":
        new_head[0] += 20
    elif direction == "up":
        new_head[1] -= 20
    else:
        new_head[1] += 20

    snake.goto(new_head)

    if snake.pos() == food_position:
        # 吃到食物，增长蛇身
        snake_length += 1
        grow_snake()
        generate_food()

    snake_body.append(snake.pos())
    if snake.pos() in snake_body[:-1]:
        game_over()

# 游戏主循环
while True:
    for event in turtle.event.get():
        if event.type == "key":
            if event.keycode == 65:  # 'A'键向左
                direction = "left"
            elif event.keycode == 68:  # 'D'键向右
                direction = "right"
            elif event.keycode == 72:  # 'W'键向上
                direction = "up"
            elif event.keycode == 80:  # 'P'键向下
                direction = "down"

    move_snake()
    if not snake_position[0] in range(-390, 400) or not snake_position[1] in range(-390, 400):
        game_over()
    turtle.update()

# 辅助函数
def grow_snake():
    for _ in range(len(snake_body) - snake_length):
        snake_body.pop(0)

def generate_food():
    global food_position
    while food_position in snake_body:
        food_position = [random.randint(-300, 300), random.randint(-300, 300)]

def game_over():
    print("Game Over!")
    turtle.bye()

move_snake()