save project

snake.py

@@ -25,27 +25,29 @@ while True:
         if event.type == locals.QUIT:
             # 接收到退出事件后退出程序
             exit()
-        if event.type == locals.KEYDOWN:
+        elif event.type==locals.KEYDOWN:
             if event.key==locals.K_RIGHT and setheading !="left":
-                setheading="right"
+                setheading='right'
                 snake_head=right
             if event.key==locals.K_LEFT and setheading !="right":
-                setheading="left"
+                setheading='left'
                 snake_head=left
-            if event.key==locals.K_UP and setheading !="down":
-                setheading="up"
-                snake_head=up
             if event.key==locals.K_DOWN and setheading !="up":
-                setheading="down"
+                setheading='down'
                 snake_head=down
+            if event.key==locals.K_UP and setheading !="down":
+                setheading='up'
+                snake_head=up
+
     if setheading=="right":
-        x+=30
-    if setheading=="left":
-        x-=30
-    if setheading=="up":
-        y-=30
-    if setheading=="down":
-        y+=30
+        x=x+30
+    elif setheading=="left":
+        x=x-30
+    elif setheading=="up":
+        y=y-30
+    elif setheading=="down":
+        y=y+30
+
     position.append((x,y))
     position.pop(0)
     # 将背景图画上去