I think if += would always have to make a copy, I would have opted to not support it for lists at all and just say .extend(), which does work in that tuple case.
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用
。体育直播对此有专业解读
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两汉至北朝近800年的风云变幻，在东魏北齐时代的邺城画上了一个句号，最终奠定了隋唐盛世的文化基因。