Solutions for the "hard" problems in the Fall 2019 SPLICE Club "Get to know Python" workshop

solutions_hard.py

# Problem 1
# blank board
tic_tac_toe = [
    ['□', '□', '□'],
    ['□', '□', '□'],
    ['□', '□', '□']
]

# Problem 2
def show_board(board):
    for row in board:
        string = ""
        for item in row:
            string += item + " "

        print(string)

# Problem 3
def is_won(board):
    # Check if the rows contain a winning condition
    for row in board:
        # I realize that I forgot to mention the 'and', 'or', and 'not'
        # conditions. They allow you to use multiple conditions in your 
        # if statements and check for false (as their same suggests)
        if row[0] != '□' and row[0] == row[1] and row[1] == row[2]:
            return True
    
    # Check if the columns contain a winning condition
    for col in range(len(row[0])):
        if board[0][col] != '□' and board[0][col] == board[1][col] and board[1][col] == board[2][col]:
            return True
    
    # Check if the diagonals contain a winning condition
    if board[0][0] != '□' and board[0][0] == board[1][1] and board[1][1] == board[2][2]:
        return True

    if board[0][2] != '□' and board[0][2] == board[1][1] and board[1][1] == board[2][0]:
        return True
    
    return False

# Problem 4
def is_draw(board):
    for row in board:
        for item in row:
            if item == '□':
                return False
    
    return True

# While the game is not a draw
while not is_draw(tic_tac_toe):
    show_board(tic_tac_toe)

    # Player 1 move
    while True:
        x = int(input("Enter the X coordinate (1-3) of your move: ")) - 1
        y = int(input("Enter the Y coordinate (1-3) of your move: ")) - 1
        if x < 0 or x > 2 or y < 0 or y > 2:
            print('Invalid coordinates. Please try again.')
            continue
        
        if tic_tac_toe[y][x] != '□':
            print('This move has already been played. Please try again.')
            continue

        tic_tac_toe[y][x] = 'X'
        if is_won(tic_tac_toe):
            print('Player 1 wins!')
            # Exit program
            exit(0)
        else:
            break
    
    show_board(tic_tac_toe)

    if is_draw(tic_tac_toe):
        print('Game is a draw!')
        # Exit program
        exit(0)

    while True:
        x = int(input("Enter the X coordinate (1-3) of your move: ")) - 1
        y = int(input("Enter the Y coordinate (1-3) of your move: ")) - 1
        if x < 0 or x > 2 or y < 0 or y > 2:
            print('Invalid coordinates. Please try again.')
            continue
        
        if tic_tac_toe[y][x] != '□':
            print('This move has already been played. Please try again.')
            continue

        tic_tac_toe[y][x] = 'O'
        if is_won(tic_tac_toe):
            print('Player 2 wins!')
            # Exit program
            exit(0)
        else:
            break

print('Game is a draw!')