save project

snake.py

@@ -26,27 +26,28 @@ while True:
             # 接收到退出事件后退出程序
             exit()
         if event.type==locals.KEYDOWN:
-            if event.key == locals.K_RIGHT and head!="left":
-                head="right"
-                snake_head=right
-            if event.key == locals.K_LEFT and head!="right":
-                head="left"
-                snake_head=left
-            if event.key == locals.K_UP and head!="down":
-                head="up"
-                snake_head=up
-            if event.key == locals.K_DOWN and head!="up":
-                head="down"
-                snake_head=down
-    # 将背景图画上去
-    if head=="right":
+            if event.key==locals.K_RIGHT and head != "left":
+                head = "right"
+                snake_head = right
+            if event.key==locals.K_LEFT and head != "right":
+                head = "left"
+                snake_head = left
+            if event.key==locals.K_UP and head != "down":
+                head = "up"
+                snake_head = up
+            if event.key==locals.K_DOWN and head != "up":
+                head = "down"
+                snake_head = down
+    if head == "right":
         x+=30
-    elif head=="left":
-        x-=30  
-    elif head=="down":
-        y+=30
-    else:
+    elif head == "left":
+        x-=30
+    elif head == "up":
         y-=30
+    elif head == "down":
+        y+=30
+
+
     place.append((x,y))
     place.pop(0)
     screen.blit(background, (0, 0))