python 小游戏《2048》字符版非图形界面

参考链接：闲谈2048小游戏和数组的旋转及翻转和转置

2048

一、方阵类

二、随机插入1或2

三、合并和递增

四、判断和移动

五、键盘控制

完整源代码

玩法过程

2048

上回说到2048小游戏中数组的各种旋转、翻转的方法，就是为代码编程作准备的；有了这些再就加上二维数组各行列上元素的合并、能否被合并的判断、成功失败的判断等等；以及再加上键盘按键的控制，小游戏就基本完成了。

一、方阵类

方阵就是高宽相同的矩阵，2048用方阵就行了，写代码也省事一点，方阵的类如下：

>>> from random import sample
>>> class Matrix:
... def __init__(self, order=4):
... self.order = order
... self.matrix = self.new()
... def __repr__(self):
... m, n = [], len(str(2**max(sum(self.matrix,[]))))
... for mat in self.matrix:
... m.append(', '.join(f'{2**x if x else 0:>{n}}' for x in mat))
... return '],\n ['.join(m).join(['[[',']]'])
... def new(self):
... n = self.order
... m = sample([0]*(n*n-2)+sample([0,1,1],2),n*n)
... return [m[i*n:i*n+n] for i in range(n)]
...
...
>>> Matrix()
[[0, 0, 2, 0],
[0, 0, 0, 0],
[0, 0, 2, 0],
[0, 0, 0, 0]]
>>> Matrix()
[[0, 0, 0, 0],
[0, 0, 0, 0],
[0, 0, 2, 0],
[0, 0, 0, 0]]

在方阵中随机产生1~2个1，sample([0,1,1],2) 生成的1个还是2个，比例为2:1；

在__repr__方法中显示时，这些1作为2的指数，所以显示为2^1=2。

二、随机插入1或2

def insert(self):
n = self.order
m = [i for i,n in enumerate(sum(self.matrix,[])) if not n]
if m:
i = sample(m, 1)[0]
self.matrix[i//n][i%n] = sum(sample([1,1,1,2],1))

或者：

def insert(self):
n = self.order
m = [(i,j) for j in range(n) for i in range(n) if not self.matrix[i][j]]
if m:
i, j = sample(m, 1)[0]
self.matrix[i][j] = sum(sample([1,1,1,2],1))

三、合并和递增

......
for i,array in enumerate(self.matrix):
self.matrix[i] = Matrix.update(array)
......
def update(array):
split = lambda a: [_ for _ in a if _]+[_ for _ in a if not _]
array = split(array)
for i,a in enumerate(array):
if i and a and a==array[i-1]:
array[i-1] += 1
array[i] = 0
return split(array)

四、判断和移动

略……写得有点复杂，可以到完整代码中阅读。

五、键盘控制

引入keyboard库控制键盘，示例如下：

import keyboard  
  
def keys0():  
    print("Left key pressed")  
  
def keys1():  
    print("Right key pressed")  
  
def keys2():  
    print("Up key pressed")  
  
def keys3():  
    print("Down key pressed")  
  
def restart():  
    print("Enter key pressed")  
  
# 添加热键  
keyboard.add_hotkey('left', keys0)  
keyboard.add_hotkey('right', keys1)  
keyboard.add_hotkey('up', keys2)  
keyboard.add_hotkey('down', keys3)  
keyboard.add_hotkey('enter', restart)  
  
# 等待用户按下esc键  
print("Waiting for ESC to exit...")  
keyboard.wait('esc')  
  
# 在这里移除所有热键  
print("Removing all hotkeys...")  
keyboard.unhook_all_hotkeys()

Waiting for ESC to exit...
Left key pressed
Right key pressed
Up key pressed
Down key pressed
Enter key pressed
Removing all hotkeys...
>>>

注：最后一行代码keyboard.unhook_all_hotkeys()很关键，一定都有否则即使按了ESC键退出程序，热键还是驻留在内存里，键盘还会响应keyboard.add_hotkey()添加的热键。

完整源代码

import keyboard
from random import sample

class Matrix:
    def __init__(self, order=4):
        self.over = False
        self.order = order
        self.matrix = self.new()
        self.victory = False
    def __repr__(self):
        m, n = [], len(str(2**max(sum(self.matrix,[]))))
        for mat in self.matrix:
            m.append(', '.join(f'{2**x if x else 0:>{n}}' for x in mat))
        return '],\n ['.join(m).join(['[[',']]'])
    def new(self):
        n = self.order
        m = sample([0]*(n*n-2)+sample([0,1,1],2),n*n)
        return  [m[i*n:i*n+n] for i in range(n)]
    def show(self):
        if self.over or self.victory:
            print('Enter to restart...')
        else:
            print(self)
            print()
    def insert(self):
        n = self.order
        m = [(i,j) for j in range(n) for i in range(n) if not self.matrix[i][j]]
        if m:
            i, j = sample(m, 1)[0]
            self.matrix[i][j] = sum(sample([1,1,1,2],1))
    def full(self):
        return all(sum(self.matrix,[]))
    def move(self, direction=0):
        if self.over or self.victory: return
        direction %= 4
        if direction == 0:  #left
            if self.cannotmove(0): return
        elif direction == 1:  #right
            if self.cannotmove(1): return
            self.matrix = self.flipH()
        elif direction == 2:  #up
            if self.cannotmove(2): return
            self.matrix = self.rotL()
        elif direction == 3:  #down
            if self.cannotmove(3): return
            self.matrix = self.rotR()
        for i,array in enumerate(self.matrix):
            self.matrix[i] = Matrix.update(array)
        if direction == 1:
            self.matrix = self.flipH()
        elif direction == 2:
            self.matrix = self.rotR()
        elif direction == 3:
            self.matrix = self.rotL()
        indexmax = max(sum(self.matrix,[]))
        if self.order==2 and indexmax==4 or self.order==3 and indexmax==7 or indexmax==self.order+7:
            self.victory = True
            print(self)
            print('Win! Enter to restart...')
            return
        self.insert()
        self.over = self.cannotmove()
        if self.over:
            print(self)
            print('Gave over!')
    def cannotmove(self, direction = 4):
        m, n = self.matrix, self.rotR()
        p, q = self.rotL(), self.flipH()
        if direction==0:
            return all(n[0]) and Matrix.cannotupdate(m)
        elif direction==1:
            return all(n[-1]) and Matrix.cannotupdate(q)
        elif direction==2:
            return all(m[0]) and Matrix.cannotupdate(n)
        elif direction==3:
            return all(m[-1]) and Matrix.cannotupdate(p)
        else:
            return (self.full() and self.cannotmove(0) and self.cannotmove(1)
                and self.cannotmove(2) and self.cannotmove(3))
    def cannotupdate(matrix):
        return all([m==Matrix.update(m) for m in matrix])
    def update(array):
        split = lambda a: [_ for _ in a if _]+[_ for _ in a if not _]
        array = split(array)
        for i,a in enumerate(array):
            if i and a and a==array[i-1]:
                array[i-1] += 1
                array[i] = 0
        return split(array)
    def flipH(self):
        m, n = self.matrix, self.order
        return [[m[i][n-j-1] for j in range(n)] for i in range(n)]
    def flipV(self):
        m, n = self.matrix, self.order
        return [[m[n-j-1][i] for i in range(n)] for j in range(n)]
    def rotL(self):
        m, n = self.matrix, self.order
        return [[m[j][n-i-1] for j in range(n)] for i in range(n)]
    def rotR(self):
        m, n = self.matrix, self.order
        return [[m[n-j-1][i] for j in range(n)] for i in range(n)]

def move(i):
    mat.move(i)
    mat.show()
def keys0():  
    move(0)
def keys1():  
    move(1)
def keys2():  
    move(2)
def keys3():  
    move(3)
def restart():
    global mat
    if mat.victory:
        mat.order += 1
        mat = Matrix(mat.order)
        mat.show()
    if mat.over:
        if mat.order>3:
            mat.order -= 1
        mat = Matrix(mat.order)
        mat.show()

if __name__ == '__main__':
    print("《2048小游戏》")
    print("上下左右前头控制方向，按ESC退出...") 
    mat = Matrix(2)
    mat.show()
    keyboard.add_hotkey('left', keys0)
    keyboard.add_hotkey('right', keys1) 
    keyboard.add_hotkey('up', keys2)
    keyboard.add_hotkey('down', keys3)
    keyboard.add_hotkey('enter', restart)
    keyboard.wait('esc')  # 等待用户按下esc键退出
    print('bye!')
    keyboard.unhook_all_hotkeys()  # 退出后移除所有热键