Learning Pygame(simple 2d), part 3 Recognizing clicks

Now that you have a screen we need to do some work on the clicking a square and displaying the result.
So far we have:

import pygame

import sys

import time

from pygame import *

pygame.init()

ttt = pygame.display.set_mode((300,325))

pygame.display.set_caption('Tic-Tac-Toe')

# X will go first

XO = "X"

# Empty Grid

grid = [[ None, None, None],

	[ None, None, None],

	[ None, None, None,]]


def initBoard(ttt):

	# Initialize the board and return it

	# As a variable

	# ttt : a properly initialized display variable

	background = pygame.Surface(ttt.get_size())

	background = background.convert()

	background.fill((255,255,255))

	# Draw the grid lines

	# Vertical lines

	pygame.draw.line(background, (0,0,0), (100,0), (100, 300), 2)

	pygame.draw.line(background, (0,0,0), (200,0), (200, 300), 2)

	# Horizontal lines

	pygame.draw.line(background, (0,0,0), (0,100), (300, 100), 2)

	pygame.draw.line(background, (0,0,0), (0,200), (300, 200), 2)

	# Return the board

	return background



def showBoard(ttt, board):

	# Redraw the board on the screen(ttt)

	drawStatus(board)

	ttt.blit(board, (0,0))

	pygame.display.flip()


board = initBoard()

running = True

while (running == True):

	for event in pygame.event.get():

		if event.type is QUIT:

			running = False

and it is starting to have some meat to the program.
Now we will start two new functions called: boardPos and clickBoard
boardPos:

def boardPos(mouseX, mouseY):

	# Determine the row 

	if mouseY < 100:

		row = 0

	elif mouseY < 200:

		row = 1

	else:

		row = 2

	# Determine column

	if mouseX < 100:

		col = 0

	elif mouseX < 200:

		col = 1

	else:

		col = 2

	# Return the two

	return row, col

boardPos checks the mouse position given and determines the row and column clicked on.
It then returns their values.

clickBoard:

def clickBoard(board):

	# Determine where clicked and draw

	# tell Python to acess globals grid and XO

	global grid

	global XO

	mouseX, mouseY = pygame.mouse.get_pos()

	row, col = boardPos(mouseX, mouseY)

	

	# Don't use this space

	if grid[row][col] == "X" or grid[row][col] == "O":

		return

	if XO == "X":

		XO = "O"

	else:

		XO = "X"

clickBoard finds the mouse position when clicking and checks if the space is occupied.
If occupied it leaves the function.
If it is not occupied it changes the turn, later we will make it display the "X" or "O".
Now we will finish off this section by editing our main loop.

board = initBoard(ttt)

[B]mouseX, mouseY = pygame.mouse.get_pos()[/B]

running = True

while (running == True):

	for event in pygame.event.get():

		if event.type is [B]pygame.QUIT[/B]:

			running = False

		[B]elif event.type is pygame.MOUSEBUTTONDOWN:

			clickBoard(board)[/B]

pygame.mouse.get_pos() simply returns a tuple of the mouse's current coordinates.
Note:I fixed the first if in the main loop it was just QUIT should be pygame.QUIT
Now on to the next tutorial!