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snake.py

@@ -64,7 +64,7 @@ while True:
         score+=10
         score+=10
     else:
     else:
         position.pop(0)
         position.pop(0)
-    if x <0 or  x>630 or y <0  or y>450:
+    if x < 0 or x > 630 or y < 0 or y> 450:
     # 将背景图画上去
     # 将背景图画上去
     screen.blit(background, (0, 0))
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
     # 将贪吃蛇的头画上去