6-2sanmoku1

import random
import math


first = "○"
second = "×"
mark = {0 : "－", 1 : "", -1 : ""}
#1：プレイヤー、-1：コンピュータ


field = [[0, 0, 0], [0, 0, 0], [0, 0, 0]]
input_number = ["１", "２", "３", "４", "５", "６", "７", "８","９"]


def senkou_koukou():
    print("先攻（○）後攻（×）を決めます。")
    choice = int(input("0か1を入力してください。"))
    first_attack = random.randint(0, 1)


    print("先攻は " + str(first_attack) + "です。")


    if choice == first_attack:
        print("あなたは先攻です。")
        mark[1] = first
        mark[-1] = second
    else:
        print("あなたは後攻です。")
        mark[1] = second
        mark[-1] = first


    print(mark)


def print_field():
    str_line = ""


    print("")
    print("=====")
    for i in range(3):
        for j in range(3):
            if field[i][j] == 0:
                str_line += input_number[i * 3 + j]
            else:
                str_line += mark[field[i][j]]
            if j < 2:
                str_line += "｜"
        print(str_line)
        str_line = ""
        if i < 2:
            print("－＋－＋－")
    print("=====")
    print("")


def input_player(turn):
    print("表示されている番号のいずれかを入力してください。")
    while (True):
        input_str = input("")
        if input_str.isdigit():
            input_int = int(input_str)
            if input_int >= 1 and input_int <= 9:
                row = math.floor((input_int - 1) / 3)
                col = (input_int - 1) % 3
                if field[row][col] == 0:
                    field[row][col] = 1
                    break
        print("")
        print("もう一度、表示されている番号のいずれかを入力してください。")




def input_computer(turn):
    while (True):
        row = random.randint(0, 2)
        col = random.randint(0, 2)
        if field[row][col] == 0:
            print("コンピュータは " + str(row * 3 + col + 1) + " を選びました。" )
            field[row][col] = -1
            break


def check_winner(player_number):
    win = False
    for i in range(3):
        if sum(field[i]) == player_number * 3:
            win = True
            break
    if win == False:
        for j in range(3):
            if field[0][j] + field[1][j] + field[2][j] == player_number * 3:
                win = True
                break
    if win == False:
        if field[0][0] + field[1][1] + field[2][2] == player_number * 3:
            win = True
        elif field[2][0] + field[1][1] + field[0][2] == player_number * 3:
            win = True


    return win


def field_full():
    is_full = True
    for i in range(3):
        for j in range(3):
            if field[i][j] == 0:
                is_full = False
    return is_full


senkou_koukou()
print_field()


finish = False
turn = first
while (finish == False):


    if mark[1] == turn:
        input_player(turn)
        print_field()
        if check_winner(1) == True:
            print("あなたの勝ち")
            finish = True
    else:
        input_computer(turn)
        print_field()
        if check_winner(-1):
            print("あなたの負け")
            finish = True


    if finish == False and field_full() == True:
        print("引き分け")
        finish = True


    if turn == first:
        turn = second
    else:
        turn = first