Python更新列表更改在函数外部还原

Question

我用python3创建了一个简单的Tic-Tac-Toe游戏。游戏本身的工作完全是因为它应该，唯一的问题是，我有复位功能没有正确地擦板。它设置值并打印出来，然后在下一次操作中使用旧值

这个问题的关键是，当你选择，是的，你想再玩一次，游戏立即结束，因为它使用的最后板从上一个游戏。我试过几种不同的方法，但结果都一样。这是一个范围问题吗？代码中的一个明显错误。这个问题应该包含在reset（）函数中，其他的都在上下文中

#Tic-Tac-Toe Simulator

from random import *

board = [' ']*9
end = 0
abc = ['A', 'B', 'C']
count = 0
action = str

def render():
    print('3 ' + board[0] + '|' + board[1] + '|' + board[2])
    print('  -----')
    print('2 ' + board[3] + '|' + board[4] + '|' + board[5])
    print('  -----')
    print('1 ' + board[6] + '|' + board[7] + '|' + board[8])
    print('  A B C\n')

def winCheck():
    print(board)
    if board[0] == board[1] == board[2] != ' ':
        return board[0]
    elif board[3] == board[4] == board[5] != ' ':
        return board[3]
    elif board[6] == board[7] == board[8] != ' ':
        return board[6]
    elif board[0] == board[3] == board[6] != ' ':
        return board[0]
    elif board[1] == board[4] == board[7] != ' ':
        return board[1]
    elif board[2] == board[5] == board[8] != ' ':
        return board[2]
    elif board[0] == board[4] == board[8] != ' ':
        return board[0]
    elif board[2] == board[4] == board[6] != ' ':
        return board[2]
    else:
        return 0

def convert(location):
    coords = list(location.upper())
    if coords[0] == 'A' and coords[1] == '3':
        return 0
    if coords[0] == 'A' and coords[1] == '2':
        return 3
    if coords[0] == 'A' and coords[1] == '1':
        return 6
    if coords[0] == 'B' and coords[1] == '3':
        return 1
    if coords[0] == 'B' and coords[1] == '2':
        return 4
    if coords[0] == 'B' and coords[1] == '1':
        return 7
    if coords[0] == 'C' and coords[1] == '3':
        return 2
    if coords[0] == 'C' and coords[1] == '2':
        return 5
    if coords[0] == 'C' and coords[1] == '1':
        return 8

def move(letter, location):
    board[convert(location)] = letter.upper()

def spotCheck(location):
    if board[convert(location)] == ' ':
        return False
    else:
        return True

def reset():
    board = [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ']
    print(board)
    end = 0
    abc = ['A', 'B', 'C']
    count = 0
    action = str

def main():
    count = 0
    letter = str
    turn = 'x'
    while letter not in ['x', 'o']:
        letter = str(input("Would you like to play as 'X' or 'O': ")).lower()
    print("Please enter moves in the form of coordinates, such as A2 or C1")
    render()
    while winCheck() == 0:
        if letter == turn:
            action = str(input('Enter move: '))
            while spotCheck(action) == True:
                action = str(input('Space occupied, try again: '))
            move(letter, action)
        else:
            x = randint(0, 2)
            y = randint(1, 3)
            x = abc[x]
            action = x + str(y)
            while spotCheck(action) == True:
                x = randint(0, 2)
                y = randint(1, 3)
                x = abc[x]
                action = x + str(y)
            move(turn, action)
        render()
        if turn == 'x':
            turn = 'o'
        else:
            turn = 'x'
        count = count + 1
        if count == 9:
            break
    if winCheck() == 'X':
        print('X has won the game!')
    if winCheck() == 'O':
        print('O has won the game!')
    if winCheck() == 0:
        print('The game is a tie!')

main()
if input("Would you like to play again? ").lower() in ['y','yes']:
    reset()
    main()

Answer 1

您正在创建与全局变量同名的新局部变量。按名称读取变量（如果您没有在函数范围中用相同的名称声明它们）是可行的，如果您想修改它们，请向python“解释”您指的是全局变量：

def reset():
    global board  
    global end  
    global abc  
    global count  
    global action 
    board = [' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ']
    print(board)
    end = 0
    abc = ['A', 'B', 'C']
    count = 0
    action = str   # where does str come from?

阅读更多信息：Use of "global" keyword in Python