Map/Maze Python Pygame Test

import math, random, sys
import pygame
from pygame.locals import *

# exit the program
def quit():
    for event in pygame.event.get():
        if event.type == QUIT or (event.type == KEYDOWN and event.key == K_ESCAPE):
            return True
    return False

class gameMap:
    def __init__(self, dimensions, mapData):
        global W, H
        self.width, self.height = dimensions
        self.data = mapData

        self.cellWidth = W / self.width
        self.cellHeight = H / self.height

    def draw(self, display):
        global WHITE
        for y in range(self.height):
            for x in range(self.width):
                if self.data[y][x] == 1:
                    pygame.draw.rect(display, WHITE, (x * self.cellWidth, y * self.cellHeight, self.cellWidth, self.cellHeight), 0)

    def testCollision(self, x, y):
        return self.data[y][x]

class player:
    def __init__(self):
        self.x = 0
        self.y = 0
        self.dx = 0
        self.dy = 0

    def setLocation(self, x, y):
        self.x = x
        self.y = y

    def draw(self, display, map):
        pygame.draw.rect(display, BLUE, (self.x * map.cellWidth, self.y * map.cellHeight, map.cellWidth, map.cellHeight), 0)

    def keys(self):
        k = pygame.key.get_pressed()
        if k[K_UP]: self.dy = -1
        elif k[K_DOWN]: self.dy = 1
        else: self.dy = 0

        if k[K_LEFT]: self.dx = -1
        elif k[K_RIGHT]: self.dx = 1
        else: self.dx = 0

    def move(self, map):
        if not map.testCollision(self.x + self.dx, self.y + self.dy):
            self.x += self.dx
            self.y += self.dy

        if self.x > map.width: self.x = map.width
        if self.x < 0: self.x = 0

        if self.y > map.height: self.y = map.height
        if self.y < 0: self.y = 0

    def do(self, display, map):
        self.draw(display, map)
        self.keys()
        self.move(map)

# define display surface
W, H = 1280, 720
HW, HH = W / 2, H / 2

# initialise display
pygame.init()
FONT = pygame.font.SysFont(None, 72)
CLOCK = pygame.time.Clock()
DS = pygame.display.set_mode((W, H))
pygame.display.set_caption("code.Pylet - Pacman Walls")
FPS = 30

# define some colors
BLACK = (0, 0, 0, 255)
WHITE = (255, 255, 255, 255)
BLUE = (0, 0, 255, 255)

level = [
    [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
    [1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1],
    [1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1],
    [1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1],
    [1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1],
    [1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1],
    [1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1],
    [1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1],
    [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
]

M = gameMap((16, 9), level)
P = player()
P.setLocation(1, 1)

# main loop
while not quit():
    M.draw(DS)
    P.do(DS, M)

    pygame.display.update()
    CLOCK.tick(FPS)
    DS.fill(BLACK)
pygame.quit()
sys.exit()