Pygame Clean Code and Collision Example

import pygame
import itertools
from pygame.sprite import Group, Sprite

map_data = [
       [ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
       [ 1,0,0,0,0,1,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
       [ 1,0,0,0,0,1,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
       [ 1,0,0,0,0,1,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
       [ 1,0,0,0,0,1,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
       [ 1,0,0,0,0,1,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
       [ 1,0,0,0,0,1,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
       [ 1,0,0,0,0,1,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
       [ 1,0,0,0,0,1,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
       [ 1,0,0,0,0,1,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
       [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
       [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
       [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
       [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
       [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
    ]

class Engine:
    def __init__(self, caption, width, height, flags=0):
        pygame.display.set_caption(caption)
        self.surface = pygame.display.set_mode((width, height), flags)
        self.rect = self.surface.get_rect()
        self.clock = pygame.time.Clock()
        self.running = False
        self.delta = 0
        self.fps = 60

    def idle(self):
        self.delta = self.clock.tick(self.fps)

class Point:
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def __add__(self, rhs):
        return Point(self.x + rhs.x, self.y + rhs.y)

    def __sub__(self, rhs):
        return Point(self.x - rhs.x, self.y - rhs.y)

    def __mul__(self, rhs):
        return Point(self.x * rhs.x, self.y * rhs.y)

    def __truediv__(self, rhs):
        return Point(self.x / rhs.x, self.y / rhs.y)

    def __floordiv__(self, rhs):
        return Point(self.x // rhs.x, self.y // rhs.y)

    def __iter__(self):
        yield self.x
        yield self.y

class MovementKeys:
    def __init__(self, up, down, left, right):
        self.up = up
        self.down = down
        self.left = left
        self.right = right

class Player(Sprite):
    def __init__(self, image, movement_keys, position, anchor="topleft"):
        Sprite.__init__(self)
        self.image = image
        self.rect = image.get_rect(**{anchor: position})
        self.center = pygame.Vector2(self.rect.center)
        self.speed = 8 * 0.01

        self.key = movement_keys

    def get_position(self, size):
        return Point(int(self.center.x // size.x), int(self.center.y // size.y))

    def update(self, delta, keys_pressed, grid):
        direction = pygame.Vector2(0, 0)
        if keys_pressed[self.key.up]:
            direction.y -= 1

        if keys_pressed[self.key.down]:
            direction.y += 1

        if keys_pressed[self.key.left]:
            direction.x -= 1

        if keys_pressed[self.key.right]:
            direction.x += 1

        if direction != pygame.Vector2(0, 0):
            direction.normalize_ip()
            old_center = pygame.Vector2(self.center)
            self.center += direction * self.speed * delta
            self.rect.center = self.center

            # Collision
            if grid.collide(self):
                self.center = old_center
                self.rect.center = self.center

class Grid:
    def __init__(self, screen_size, block_size):
        self.block_range = Point(int(screen_size.x / block_size.x) + 1,
                                 int(screen_size.y / block_size.y) + 1)
        self.block_size = block_size
        self.position = Point(0, 0)

    def collide(self, player):
        rects = self.get_rects(player.get_position(self.block_size))
        for rect in rects:
            if rect.colliderect(player.rect):
                return True

        return False

    def collide_list(self, player):
        rect_list = []
        rects = self.get_rects(player.get_position(self.block_size))
        for rect in rects:
            if rect.colliderect(player.rect):
                rect_list.append(rect)

        return rect_list

    def get_rects(self, position):
        rect = pygame.Rect(0, 0, *self.block_size)
        rect_list = []
        for x, y in itertools.product(range(position.x - 1, position.x + 2), range(position.y - 1, position.y + 2)):
            try:
                if map_data[y][x] == 1:
                    rect.topleft = x * self.block_size.x, y * self.block_size.y
                    rect_list.append(rect.copy())
            except:
                pass

        return rect_list

    def draw(self, surface):
        rect = pygame.Rect(0, 0, *self.block_size)
        color = pygame.Color('gray30')
        for x, y in itertools.product(range(self.position.x, self.block_range.x), range(self.position.y, self.block_range.y)):
            try:
                if map_data[y][x] == 1:
                    rect.topleft = x * self.block_size.x, y * self.block_size.y
                    surface.fill(color, rect)
            except:
                pass

class GameVariables:
    def __init__(self, engine):
        self.engine = engine
        self.sprites = Group()
        self.block_size = Point(32, 32)
        self.player_size = Point(24, 24)
        self.grid = Grid(Point(*engine.rect.size), self.block_size)
        self.player_blue = self.create_player(pygame.Color('dodgerblue'), engine.rect.center, "center")
        self.sprites.add(self.player_blue)

    def create_player(self, color, position, anchor):
        surface = pygame.Surface(tuple(self.player_size))
        surface.fill(pygame.Color('dodgerblue'))
        movement_keys = MovementKeys(pygame.K_w, pygame.K_s, pygame.K_a, pygame.K_d)
        return Player(surface, movement_keys, position, anchor)

def main():
    pygame.init()
    engine = Engine("Player Movement And Collision", 500, 500)
    background = pygame.Color('black')
    game = GameVariables(engine)

    engine.running = True
    while engine.running:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                engine.running = False

        # Logic
        keys_pressed = pygame.key.get_pressed()
        game.sprites.update(engine.delta, keys_pressed, game.grid)

        # Drawing
        engine.surface.fill(background)
        game.grid.draw(engine.surface)
        game.sprites.draw(engine.surface)
        pygame.display.update()

        # Sleeping
        engine.idle()

main()