save project

snake.py

@@ -53,6 +53,13 @@ while True:
     else:
         y+=30  
     snake.append((x,y))
+    for i in range(len(snake)-1):
+        if snake[-1] == snake[i]:
+            exit()
+
+    if x<0 or x>630 or y<0 or y>450:
+        exit()      
+
     if x==ap1 and y==ap2:
         ap1=(random.randint(0,21))*30
         ap2=(random.randint(0,15))*30
@@ -78,6 +85,6 @@ while True:
     
     # 刷新画面
     pygame.display.update()
-    FPS.tick(5)
+    FPS.tick(6)
 
  
\ No newline at end of file