save project

snake.py

@@ -52,8 +52,8 @@ while True:
         y -= 30
     else:
         y += 30
-    if (x>630 or x<0 or y>450 or y<0) or ((x,y)in st):
-        
+    if (x>630 or x<0 or y>450 or y<0) or ((x,y)in position):
+        exit()
     position.append((x, y))
     if x==apple_x and y==apple_y:
         num1=random.randint(1,22)
@@ -78,4 +78,4 @@ while True:
     screen.blit(food, (apple_x,apple_y ))
     # 刷新画面
     pygame.display.update()
-    FPSCLOCK.tick(10)
\ No newline at end of file
+    FPSCLOCK.tick(3)
\ No newline at end of file