tictactoe.py

# Before your interview, write a program that lets two humans play a game of Tic Tac Toe in a terminal. 
# The program should let the players take turns to input their moves. 
# The program should report the outcome of the game.
# Anthony Burdi 2/5/2015

import tictactoe_helper as th

class ticTacToeGame:
	"""Store current game for display"""
	gameState = [None,None,None,None,None,None,None,None,None]

class player:
	"""Store player data"""
	def __init__(self, name, number):
		self.name = name
		self.n = number
		# Manually assign X and O:
		if number == 1:
			self.sym = "X"
		else:
			self.sym = "O"
		# Initialize player's moves, used to check for win:		
		self.moves = [0,0,0,0,0,0,0,0,0]

if __name__ == '__main__':
	""" Main program"""

	print "TicTacToe - get ready!"
	game = ticTacToeGame()

	# Solicit players names:
	player1 = player(raw_input("Player 1! Nice to meet you. What is your name? "), 1)
	player2 = player(raw_input("Player 2! Nice to meet you. What is your name? "), 2)
	# It is OK and allowed if players enter the same name, but it will be confusing.

	# Iterate through set maximum number of turns, displaying current state and soliciting new moves:
	for turn in range(1,10):
		th.printGameState(game,player1,player2,turn)
		if turn%2: 
			# Odd numbered turns, player 1 move
			th.inputMove(player1, game)
			if th.checkForWinner(player1):
				print str(player1.name) + " wins!! Congratulations!" # use str() in case non-str entered as name
				break
		else:
			# Player 2 move
			th.inputMove(player2, game)
			if th.checkForWinner(player2):
				print str(player2.name) + " wins!! Congratulations!"
				break
	if not th.checkForWinner(player1) and not th.checkForWinner(player2):
		print "Sorry, no one wins. Try again!"

tictactoe_helper.py

# Helper functions for tictactoe.py
# Anthony Burdi 2/5/2015

def inputMove(player, game):
	""" """
	while True:

		# Find the available boxes and display them:
		available = []
		for idx,box in enumerate(game.gameState):
			if not box:
				available.append(idx+1)
		print "Available boxes: " + str(available)

		# Solicit box number, and do some validation:
		try:
			input = int(raw_input(player.name + ", please enter the number of the box you wish to mark moving left to right, top to bottom: "))
		except ValueError:
			print "Please enter a number between 1 and 9." # ValueError if not int()
			continue
		if 1 <= input <= 9:
			if not game.gameState[input-1]:  # Check if box is full (default for game.gameState is None)
				game.gameState[input-1] = player.sym  # Add player symbol instead
				player.moves[input-1] = input  # for later comparison with winning combinations
				break
			else:
				print "Please choose an un-chosen box."
				continue

def checkForWinner(player):
	"""Compare current player moves with all winning combinations"""
	tests = [[1,2,3],[4,5,6],[7,8,9],[1,4,7],[2,5,8],[3,6,9],[1,5,9],[3,5,7]]
	for test in tests:
		if set(test).issubset(set(player.moves)):
			return True
	return False

def printGameState(game,player1, player2, turn):
	"""Print the game state in a way that is useful to the player."""
	print "Player 1 (" + str(player1.name) + ") is using X. Player 2 (" + str(player2.name) + ") is using O."
	print "Here is how the game is shaping up so far on turn #: " + str(turn)
	print ""
	
	# Create a copy of game.gameState, then change all None to ' ' for clearer display
	temp = list(game.gameState)
	for idx,state in enumerate(temp):
		if not state:
			temp[idx] = ' '

	# Print the rows and a divider row after first two rows
	for i in [0,3,6]:
		print " " + str(temp[i]) + " | " + str(temp[i+1]) + " | " + str(temp[i+2])
		if i in [0,3]:
			print "-----------"
	print ""