编写程序，实现人机交互的3*3井字棋。玩家决定画○或画×，电脑随机位置下棋子。

好的，我可以帮你编写一个实现人机交互的3*3井字棋程序。玩家可以选择画○或画×，然后电脑会随机下棋子。

以下是代码示例：

import random

def print_board(board):
    # 打印当前的棋盘状态
    print("-------------")
    print("| " + board[0][0] + " | " + board[0][1] + " | " + board[0][2] + " |")
    print("-------------")
    print("| " + board[1][0] + " | " + board[1][1] + " | " + board[1][2] + " |")
    print("-------------")
    print("| " + board[2][0] + " | " + board[2][1] + " | " + board[2][2] + " |")
    print("-------------")

def check_win(board, player):
    # 检查是否有玩家获胜
    for i in range(3):
        if (board[i][0] == player and board[i][1] == player and board[i][2] == player) or \
           (board[0][i] == player and board[1][i] == player and board[2][i] == player) or \
           (board[0][0] == player and board[1][1] == player and board[2][2] == player) or \
           (board[0][2] == player and board[1][1] == player and board[2][0] == player):
            return True
    return False

def draw_board():
    # 初始化棋盘
    board = []
    for i in range(3):
        row = []
        for j in range(3):
            row.append(" ")
        board.append(row)
    return board

def get_player_move(board, player):
    # 玩家输入下棋位置
    valid_move = False
    while not valid_move:
        move = input("请输入你要下棋的位置(1-9)：")
        if move.isdigit() and int(move) in range(1, 10):
            row = (int(move) - 1) // 3
            col = (int(move) - 1) % 3
            if board[row][col] == " ":
                valid_move = True
                board[row][col] = player
                print_board(board)
            else:
                print("此位置已经有棋子了，请重新输入")
        else:
            print("输入有误，请重新输入")

def get_computer_move(board, computer):
    # 电脑随机下棋子
    valid_move = False
    while not valid_move:
        row = random.randint(0, 2)
        col = random.randint(0, 2)
        if board[row][col] == " ":
            valid_move = True
            board[row][col] = computer
            print("电脑在第%d行第%d列下了一枚%s棋子" % (row+1, col+1, computer))
            print_board(board)

def tic_tac_toe():
    board = draw_board()
    print_board(board)

    player = input("请选择要画的棋子(○或×)：")
    while player != "○" and player != "×":
        player = input("输入错误，请选择要画的棋子(○或×)：")

    if player == "○":
        computer = "×"
    else:
        computer = "○"

    # 随机决定谁先下棋
    if random.randint(0, 1) == 0:
        turn = 'player'
        print("你先下棋")
    else:
        turn = 'computer'
        print("电脑先下棋")

    while True:
        if turn == 'player':
            get_player_move(board, player)
            if check_win(board, player):
                print("你赢了！")
                break
            elif all([board[i][j] != " " for i in range(3) for j in range(3)]):
                print("平局！")
                break
            turn = 'computer'

        else:
            get_computer_move(board, computer)
            if check_win(board, computer):
                print("电脑赢了！")
                break
            elif all([board[i][j] != " " for i in range(3) for j in range(3)]):
                print("平局！")
                break
            turn = 'player'

# 开始游戏
tic_tac_toe()

希望这个程序对你有所帮助！