Python 不退出井字游戏

Question

我有一个非常基本的 Python 井字游戏。出于某种原因，当用户输入“e”时，游戏并没有退出。这是为什么呢？

import os
import sys
os.system("cls")

one = "1"
two = "2"
three = "3"
four = "4"
five = "5"
six = "6"
seven = "7"
eight = "8"
nine = "9"
selection = ""

def instructions():
    print("""
Welcome to Tic-Tac-Toe!
To Play, Enter a number between 1-9 to select that space
""")

def board():
    print("\t{} | {} | {}\n\t---------\n\t{} | {} | {}\n\t---------\n\t{} | {} | {}".format(one,two,three,four,five,six,seven,eight,nine))
    selection = input("\nSelect a number:\n")
    os.system("cls")

instructions()

while selection != "e":
    board()

Answer 1

原因很简单，棋盘中的选择变量和外面选中的不一样。

快速解决方法是添加

global selection

在功能板的开头。 您应该考虑阅读 Python 中的变量范围。

最终的代码将是

def board():
    global selection
    print("\t{} | {} | {}\n\t---------\n\t{} | {} | {}\n\t---------\n\t{} | {} | {}".format(one,two,three,four,five,six,seven,eight,nine))
    selection = input("\nSelect a number:\n")
    os.system("cls")