用代码写一个2048小游戏

好的，以下是一个简单的Python实现：

import random

# 定义游戏面板的大小
BOARD_SIZE = 4

# 初始化游戏面板
board = [[0] * BOARD_SIZE for _ in range(BOARD_SIZE)]

# 在空白的格子中随机生成一个2或4
def add_new_num():
    empty_pos = []
    for i in range(BOARD_SIZE):
        for j in range(BOARD_SIZE):
            if board[i][j] == 0:
                empty_pos.append((i, j))
    if len(empty_pos) > 0:
        i, j = random.choice(empty_pos)
        board[i][j] = 2 if random.random() < 0.9 else 4

# 判断是否还有空白格子
def has_empty_cell():
    for i in range(BOARD_SIZE):
        for j in range(BOARD_SIZE):
            if board[i][j] == 0:
                return True
    return False

# 将整个游戏面板向左移动
def move_left():
    global board
    new_board = [[0] * BOARD_SIZE for _ in range(BOARD_SIZE)]
    for i in range(BOARD_SIZE):
        j, k = 0, 0
        while j < BOARD_SIZE:
            if board[i][j] != 0:
                if j+1 < BOARD_SIZE and board[i][j] == board[i][j+1]:
                    # 合并相邻的相同数字
                    new_board[i][k] = board[i][j] * 2
                    j += 2
                else:
                    new_board[i][k] = board[i][j]
                    j += 1
                k += 1
            else:
                j += 1
    board = new_board

# 将整个游戏面板旋转90度，向左移动，再旋转回来
def move(direction):
    global board
    if direction == 'left':
        move_left()
    elif direction == 'right':
        board = [row[::-1] for row in board]
        move_left()
        board = [row[::-1] for row in board]
    elif direction == 'up':
        board = list(zip(*board[::-1]))
        move_left()
        board = list(zip(*board[::-1]))
    elif direction == 'down':
        board = list(zip(*board))[::-1]
        move_left()
        board = list(zip(*board[::-1]))[::-1]

# 打印游戏面板
def print_board():
    for i in range(BOARD_SIZE):
        for j in range(BOARD_SIZE):
            print(board[i][j], end='\t')
        print()

# 判断游戏是否结束
def is_game_over():
    if has_empty_cell():
        return False
    for i in range(BOARD_SIZE):
        for j in range(BOARD_SIZE):
            if (j+1 < BOARD_SIZE and board[i][j] == board[i][j+1]) or \
               (i+1 < BOARD_SIZE and board[i][j] == board[i+1][j]):
                return False
    return True

# 启动游戏
def run():
    add_new_num()
    while True:
        print_board()
        if is_game_over():
            print('Game Over!')
            break
        direction = input('Your move: ')
        if direction in ['left', 'right', 'up', 'down']:
            move(direction)
            add_new_num()
        else:
            print('Invalid move!')

你可以将这段代码保存为一个.py文件，然后在命令行中运行它，就可以开始玩2048小游戏了。