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# Python code for a simple 6-men morris game with AI

import random

# Initializing the board with empty spaces
board = [[' ', ' ', ' '], [' ', ' ', ' '], [' ', ' ', ' ']]
player = 'X'
computer = 'O'
game_over = False


# Function to print the current state of the board
def print_board():
    for line in board:
        print(line)


# Function to check if a player has won
def check_win(char):
    # Check horizontal lines
    for row in board:
        if row.count(char) == 3:
            return True

    # Check vertical lines
    for i in range(3):
        column = [board[j][i] for j in range(3)]
        if column.count(char) == 3:
            return True

    # Check diagonals
    diagonal1 = [board[i][i] for i in range(3)]
    diagonal2 = [board[i][2-i] for i in range(3)]
    if diagonal1.count(char) == 3 or diagonal2.count(char) == 3:
        return True

    return False


# Function to place a piece on the board
def place_piece(char):
    valid_move = False
    while not valid_move:
        row = int(input("Enter row (0-2): "))
        col = int(input("Enter col (0-2): "))
        if board[row][col] == ' ':
            board[row][col] = char
            valid_move = True
        else:
            print("Invalid move, try again.")
    if check_win(char):
        print(char + " wins!")
        global game_over
        game_over = True


# Function for the computer's turn
def computer_move():
    valid_move = False
    while not valid_move:
        # Generate a random move
        row = random.randint(0, 2)
        col = random.randint(0, 2)
        if board[row][col] == ' ':
            board[row][col] = computer
            valid_move = True
    if check_win(computer):
        print(computer + " wins!")
        global game_over
        game_over = True


# Game loop
print_board()
while not game_over:
    place_piece(player)
    print_board()
    if not game_over:
        computer_move()
        print_board()

Explanation:

• We first import the random module to generate pseudo-random moves for the computer.
• We initialize the board as a 2D list of size 3x3 with all spaces as empty strings (' ').
• We define the player's character as 'X', the computer's character as 'O', and set game_over as False to initiate the game.
• The print_board() function simply prints the current state of the board. It does not return anything.
• The check_win(char) function takes a character char as input (either 'X' or 'O') and checks if the player corresponding to that character has won. We check for all possible combinations of three in a row - horizontally, vertically and diagonally.
• The place_piece(char) function allows the player to place their piece on the board. It prompts the user to enter the row and column indices of where they want to place their piece. If the indices are valid (i.e. the corresponding space on the board is empty), the piece is placed and the function exits. If the indices are invalid, the player is asked to try again.
• The computer_move() function generates a random move for the computer. It keeps generating a random move until it finds an empty space on the board. Once it finds a valid move, it places the computer's piece on the board. If the computer wins after making its move, the function exits.
• Finally, we have the main game loop which alternates between the player's turn and the computer's turn. If either player wins, the corresponding message is printed and the game_over variable is set to True, which causes the loop to exit.