代码解释from random import * from turtle import * from freegames import floor, vector tiles = {} neighbors = [ vector(100, 0), vector(-100, 0), vector(0, 100), vector(0, -100), ] def load(): """Load tiles and scramble.""" count = 1 for y in range(-200, 200, 100): for x in range(-200, 200, 100): mark = vector(x, y) tiles[mark] = count count += 1 tiles[mark] = None for count in range(1000): neighbor = choice(neighbors) spot = mark + neighbor if spot in tiles: number = tiles[spot] tiles[spot] = None tiles[mark] = number mark = spot def square(mark, number): """Draw white square with black outline and number.""" up() goto(mark.x, mark.y) down() color('black', 'white') begin_fill() for count in range(4): forward(99) left(90) end_fill() if number is None: return elif number < 10: forward(20) write(number, font=('Arial', 60, 'normal')) def tap(x, y): """Swap tile and empty square.""" x = floor(x, 100) y = floor(y, 100) mark = vector(x, y) for neighbor in neighbors: spot = mark + neighbor if spot in tiles and tiles[spot] is None: number = tiles[mark] tiles[spot] = number square(spot, number) tiles[mark] = None square(mark, None) def draw(): """Draw all tiles.""" for mark in tiles: square(mark, tiles[mark]) update() setup(420, 420, 370, 0) hideturtle() tracer(False) load() draw() onscreenclick(tap) done()

这段代码是实现一个拼图游戏的程序。在程序中，首先导入了 random、turtle 和 freegames 库，然后定义了一个包含空白方块和数字方块的字典 tiles 和一个包含四个方向的向量列表 neighbors。load 函数对方块进行初始化并随机打乱，square 函数绘制数字方块，tap 函数响应玩家的点击事件并交换数字方块和空白方块的位置，draw 函数绘制所有方块，最后程序进行窗口设置和事件监听，并启动游戏。