Python的井字棋 - if语句查询

Question

我创建了一个井字棋方案2级的球员，但是当条件满足时，蟒蛇就不会打破：

def display_board(moves): 
    print (' ' + moves[0] + ' | ' + moves[1] + ' | ' + moves[2]) 
    print ('---- ---- ----') 
    print (' ' + moves[3] + ' | ' + moves[4] + ' | ' + moves[5]) 
    print ('---- ---- ----') 
    print (' ' + moves[6] + ' | ' + moves[7] + ' | ' + moves[8]) 

moves = ('   ') 

turn = 1 

player = 'X' 

def play_move(moves, row, col, turn): 
    if turn % 2 == 1: 
     player = 'X' 
    else: 
     player = 'O' 
    pos = (3 * (row - 1) + col) - 1 
    moves = moves[:pos] + player + moves[pos + 1:] 
    return moves 

game_end = False 

if moves[0] == moves[1] and moves[1] == moves[2] and moves[0] != ' ': 
    game_end = True 
if moves[3] == moves[4] and moves[4] == moves[5] and moves[3] != ' ': 
    game_end = True 
if moves[6] == moves[7] and moves[7] == moves[8] and moves[6] != ' ': 
    game_end = True  
if moves[0] == moves[3] and moves[3] == moves[6] and moves[0] != ' ': 
    game_end = True 
if moves[1] == moves[4] and moves[4] == moves[7] and moves[0] != ' ': 
    game_end = True 
if moves[2] == moves[5] and moves[5] == moves[8] and moves[0] != ' ': 
    game_end = True 
if moves[0] == moves[4] and moves[4] == moves[8] and moves[0] != ' ': 
    game_end = True  
if moves[2] == moves[4] and moves[4] == moves[6] and moves[2] != ' ': 
    game_end = True 

while not game_end: 
    display_board(moves) 
    row = int(input('Please enter the row number: ')) 
    col = int(input('Please enter the column number: ')) 
    moves = play_move(moves, row, col, turn) 
    turn += 1 
    if game_end == True: 
     break 

Link to code in a live environment

Answer 1

这一个经典的无限循环。您正在检查游戏是否仅结束一次：在开始游戏之前！

game_end = False 

if moves[0] == moves[1] and moves[1] == moves[2] and moves[0] != ' ': 
    game_end = True 
if moves[3] == moves[4] and moves[4] == moves[5] and moves[3] != ' ': 
    game_end = True 
if moves[6] == moves[7] and moves[7] == moves[8] and moves[6] != ' ': 
    game_end = True  
if moves[0] == moves[3] and moves[3] == moves[6] and moves[0] != ' ': 
    game_end = True 
if moves[1] == moves[4] and moves[4] == moves[7] and moves[0] != ' ': 
    game_end = True 
if moves[2] == moves[5] and moves[5] == moves[8] and moves[0] != ' ': 
    game_end = True 
if moves[0] == moves[4] and moves[4] == moves[8] and moves[0] != ' ': 
    game_end = True  
if moves[2] == moves[4] and moves[4] == moves[6] and moves[2] != ' ': 
    game_end = True 


while not game_end: 
    display_board(moves) 
    row = int(input('Please enter the row number: ')) 
    col = int(input('Please enter the column number: ')) 
    moves = play_move(moves, row, col, turn) 
    turn += 1 
    if game_end == True: 
     break 

在while not game_end开始循环后，就再也不会一步，因为你并没有改变变量game_end内循环：

game_end = False 
while not game_end: 
    display_board(moves) 
    row = int(input('Please enter the row number: ')) 
    col = int(input('Please enter the column number: ')) 
    moves = play_move(moves, row, col, turn) 
    turn += 1 

    game_end = False 
    if moves[0] == moves[1] and moves[1] == moves[2] and moves[0] != ' ': 
     game_end = True 
    if moves[3] == moves[4] and moves[4] == moves[5] and moves[3] != ' ': 
     game_end = True 
    if moves[6] == moves[7] and moves[7] == moves[8] and moves[6] != ' ': 
     game_end = True  
    if moves[0] == moves[3] and moves[3] == moves[6] and moves[0] != ' ': 
     game_end = True 
    if moves[1] == moves[4] and moves[4] == moves[7] and moves[1] != ' ': 
     game_end = True 
    if moves[2] == moves[5] and moves[5] == moves[8] and moves[2] != ' ': 
     game_end = True 
    if moves[0] == moves[4] and moves[4] == moves[8] and moves[0] != ' ': 
     game_end = True  
    if moves[2] == moves[4] and moves[4] == moves[6] and moves[2] != ' ': 
     game_end = True