A python game in easy way -

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#import import os import time import random  #define board board = ["", " ", " ", " ", " ", " ", " ", " ", " ", " "]  #print header def print_header():     print"""   play tic-tac-toe, need 3 in row...  choices defined, must 1 9...  """  #define print_board function  def print_board():     print "   |   |   "     print " "+board[1]+" | "+board[2]+" | "+board[3]+"  "     print "   |   |   "     print "---|---|---"     print "   |   |   "     print " "+board[4]+" | "+board[5]+" | "+board[6]+"  "     print "   |   |   "     print "---|---|---"     print "   |   |   "              print " "+board[7]+" | "+board[8]+" | "+board[9]+"  "     print "   |   |   "  def is_winner(board, player):     if (board[1] == player , board[2] == player , board[3] == player) or \         (board[4] == player , board[5] == player , board[6] == player) or \         (board[7] == player , board[8] == player , board[9] == player) or \         (board[1] == player , board[4] == player , board[7] == player) or \         (board[2] == player , board[5] == player , board[8] == player) or \         (board[3] == player , board[6] == player , board[9] == player) or \         (board[1] == player , board[5] == player , board[9] == player) or \         (board[3] == player , board[5] == player , board[7] == player):         return true     else:         return false  def is_board_full(board):     if " " in board:         return false     else:         return true  while true:     os.system("clear")     print_header()     print_board()      #get player x input     choice = raw_input("please choose empty space x. ")     choice = int(choice)      #check see if space empty first     if board[choice] == " ":         board[choice] = "x"     else:         print "sorry, space not empty!"         time.sleep(1)      #check x win     if is_winner(board, "x"):         os.system("clear")         print_header()         print_board()         print "x wins! congratulations"         break      os.system("clear")     print_header()     print_board()      #check tie (is board full)     #if board full,     if is_board_full(board):         print "tie!"         break      #get player o input     choice = raw_input("please choose empty space o. ")     choice = int(choice)      #check see if space empty first     if board[choice] == " ":         board[choice] = "o"     else:         print "sorry, space not empty!"         time.sleep(1)      #check o win     if is_winner(board, "o"):         os.system("clear")         print_header()         print_board()         print "o wins! congratulations"         break      #check tie (is board full)     #if board full,     if is_board_full(board):         print "tie!"         break