Code Editor for app.py

import streamlit as st
import numpy as np

# Initialize game state
if 'board' not in st.session_state:
    st.session_state.board = np.full((3, 3), ' ')
if 'current_player' not in st.session_state:
    st.session_state.current_player = 'X'
if 'game_over' not in st.session_state:
    st.session_state.game_over = False

# Function to check for winner
def check_winner(board):
    # Check rows, columns and diagonals
    for i in range(3):
        if board[i, 0] == board[i, 1] == board[i, 2] != ' ':
            return board[i, 0]
        if board[0, i] == board[1, i] == board[2, i] != ' ':
            return board[0, i]
    if board[0, 0] == board[1, 1] == board[2, 2] != ' ':
        return board[0, 0]
    if board[0, 2] == board[1, 1] == board[2, 0] != ' ':
        return board[0, 2]
    if ' ' not in board:
        return 'Tie'
    return None

# Function to reset game
def reset_game():
    st.session_state.board = np.full((3, 3), ' ')
    st.session_state.current_player = 'X'
    st.session_state.game_over = False

# Title
st.title('Tic Tac Toe')

# Game board display
cols = st.columns([1, 2, 1])
with cols[1]:
    for i in range(3):
        cols = st.columns(3)
        for j in range(3):
            if st.button(st.session_state.board[i, j], key=f'cell_{i}_{j}', 
                        disabled=st.session_state.game_over or st.session_state.board[i, j] != ' '):
                st.session_state.board[i, j] = st.session_state.current_player
                winner = check_winner(st.session_state.board)
                if winner:
                    st.session_state.game_over = True
                else:
                    st.session_state.current_player = 'O' if st.session_state.current_player == 'X' else 'X'
                st.rerun()

# Game status
if st.session_state.game_over:
    winner = check_winner(st.session_state.board)
    if winner == 'Tie':
        st.write('Game Over: It\'s a tie!')
    else:
        st.write(f'Game Over: Player {winner} wins!')
else:
    st.write(f'Current player: {st.session_state.current_player}')

# Reset button
if st.button('Reset Game'):
    reset_game()
    st.rerun()