save project

snake.py

@@ -52,6 +52,10 @@ while True:
         y -= 30
         y -= 30
     else:
     else:
         y += 30
         y += 30
+    if x<0 or y<0 or y>450 or x>630:
+        exit()
+    if (x,y)in position:
+        exit()
     position.append((x, y))
     position.append((x, y))
     if x==apple_x and y==apple_y:
     if x==apple_x and y==apple_y:
         apple_x=random.randint(0,21)*30
         apple_x=random.randint(0,21)*30