python 键盘上下左右控制

bif="1.jpg"
mif="2.jpg"
import pygame,sys
from pygame.locals import *

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()

x,y=0,0
movex,movey=0,0

while True:
for event in pygame.event.get():
if event.type ==QUIT:
pygame.quit()
sys.exit()
if event.type==KEYDOWN:
if event.key==K_LEFT:
movex=-1
if event.key==K_RIGHT:
movex=+1
elif event.key==K_UP:
movey=-1
elif event.key==K_DOWN:
movey=+1
if event.type==KEYUP:
if event.key==K_LEFT:
movex=0
if event.key==K_RIGHT:
movex=0
elif event.key==K_UP:
movey=0
elif event.key==K_DOWN:
movey=0

x+=movex
y+=movey

screen.blit(background,(0,0))
screen.blit(mouse_c,(x,y))

pygame.display.update()