save project

snake.py

@@ -57,6 +57,9 @@ while True:
         y += 30
     if x<0 or x>630 or y<0 or y>450:
         exit()
+    if (x,y) in position:
+        exit()
+
     if x==apple_x and y==apple_y:
         apple_x=random.randint(0,630)//30*30
         apple_y=random.randint(0,450)//30*30