Python program wont shut down!

Somebody help me. Whenever i close my python program, it wont exit! can someone tell me what is wrong?

bif="bg.jpg"
mif="ball.png"

import pygame
from pygame.locals import *
from sys import exit

pygame.init()

screen=pygame.display.set_mode((640,360),0,32)

background=pygame.image.load(bif).convert()
mouse_c=pygame.image.load(mif).convert_alpha()

while True:
    for event in pygame.event.get():
        if event.type == QUIT:
            exit()

    screen.blit(background,(0,0))

    x,y = pygame.mouse.get_pos()
    x -= mouse_c.get_width()/2
    y -= mouse_c.get_height()/2

    screen.blit(mouse_c,(x,y))

    pygame.display.update()

Code (markup):

 

how are you exiting it????

hard killl???