save project

snake.py

 import pygame
 from pygame import locals
-left = pygame.image.load('left.png')
-up = pygame.image.load('up.png')
-down = pygame.image.load('down.png')
-x=240
-y=120
-position = [(180,90),(180,120),(210,120),(x,y)]
 # 初始化pygame，为使用硬件做准备
 pygame.init()
 
@@ -17,8 +11,14 @@ background = pygame.image.load('bg.png')
 right = pygame.image.load('right.png')
 food = pygame.image.load('apple.png')
 body = pygame.image.load('body.png')
+left = pygame.image.load('left.png')
+up = pygame.image.load('up.png')
+down = pygame.image.load('down.png')
 setheading="right"
 snake_head=right
+x=240
+y=120
+position = [(180,90),(180,120),(210,120),(x,y)]
 
 while True:
     for event in pygame.event.get():
@@ -26,32 +26,32 @@ while True:
             # 接收到退出事件后退出程序
             exit()
         elif event.type==locals.KEYDOWN:
-            if event.key == locals.K_right and setheading != "left":
+            if event.key == locals.K_RIGHT and setheading != "left":
                 setheading="right"
                 snake_head=right 
-            if event.key == locals.K_left and setheading != "right":
+            if event.key == locals.K_LEFT and setheading != "right":
                 setheading="left"
                 snake_head=left 
-            if event.key == locals.K_up and setheading != "down":
+            if event.key == locals.K_UP and setheading != "down":
                 setheading="up"
                 snake_head=up 
-            if event.key == locals.K_down and setheading != "up":
+            if event.key == locals.K_DOWN and setheading != "up":
                 setheading="down"
                 snake_head=down 
-        if setheading=="right":
-            x+=30 
-        elif setheading=="left":
-            x-=30  
-        elif setheading=="up":
-            y-=30         
-        else:
-            y+=30  
+    if setheading=="right":
+        x+=30 
+    elif setheading=="left":
+        x-=30  
+    elif setheading=="up":
+        y-=30         
+    else:
+        y+=30  
     position.append((x,y))
     position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去
-    screen.blit(right, (x, y))
+    screen.blit(snake_head,position[-1])
     # 将贪吃蛇的身体画上去
     for i in range(len(position)-1):
         screen.blit(body,position[i])