Unable to load pygame image

import pygame
from pygame.locals import*
import sys

defmain():
    (w,h) = (400,400)
    (x,y) = (200,200)
    pygame.init()
    screen=pygame.display.set_mode(w,h), 0,32)
    screen=pygame.display.get_surface()
    pygame.display.set_caption("Pygame Test")

    bg = pygame.image.load("C:\prog\python\pygame\bg.png").convert_alpha
    rect_bg = bg.get_rect()

    player=pygame.image.load("C:\prog\python\pygame\player.png").convert_alpha
    rect_player=player.get_rect()
    rect_player.center=(x,y)

    while(1):
        pygame.display.update()
        pygame.time.wait(30)
        screen.fill(0,20,0,0))
        screen.blit(bg, rect_bg)
        screen.blit(player, rect_player)

        for event in pygame.event.get():
            if event.type==QUIT:
                pygame.quit()
                sys.exit()
            if event.type==KEYDOWN:
                if event.key==K_ESCAPE:
                    pygame.quit()
                    sys.exit()

main()

11 pygame.display.set_caption("Pygame Test")
     12 
--- >13bg = pygame.image.load("C:\prog\python\pygame\bg.png").convert_alpha
     14 rect_bg = bg.get_rect()
     15 

error:Couldn't open C:\prog\python\pygamg.png