Viewer/voter for my wallbase scraper

view.py

import sys
import os
import pygame
import shutil
from pygame.locals import *


prefix = "C:\\walls\\"

images = []
for filename in os.listdir(prefix):
    if (filename[0:9] == "wallpaper"):
        images.append(filename)
    



pygame.init()
size = width, height = 1920, 1200
screen = pygame.display.set_mode(size, pygame.FULLSCREEN)
pygame.mouse.set_visible(0)

currentView = 0
changed = False
print os.getcwd()
os.chdir(prefix)
currentImage = pygame.image.load(images[0])
print os.getcwd()

while 1:
    for event in pygame.event.get():
        if event.type == KEYDOWN and event.key == K_ESCAPE:
            sys.exit()
        elif event.type == KEYDOWN and event.key == K_RIGHT:
            if currentView + 1 <= len(images):
                currentView += 1
                changed = True
        elif event.type == KEYDOWN and event.key == K_LEFT:
            if currentView - 1 >= 0:
                currentView -= 1
                changed = True
        elif event.type == KEYDOWN and event.key == K_DOWN:
            shutil.move(images[currentView], "delete")
            images.remove(images[currentView])
            changed = True
        elif event.type == KEYDOWN and event.key == K_UP:
            shutil.move(images[currentView], "great")
            images.remove(images[currentView])
            changed = True
        
            
    if changed:
        currentImage = pygame.image.load(images[currentView])
        changed = False
    
    screen.blit(currentImage, (0, 0))
    pygame.display.flip()