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.
第二百四十条 海上保险合同，是指保险人按照约定，对被保险人遭受海上保险事故造成保险标的的损失和产生的责任负责赔偿，而由被保险人支付保险费的合同。，这一点在同城约会中也有详细论述
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A coroner has raised concerns over the safety of barriers at Wembley Stadium after an Oasis fan fell to his death at one of the band's concerts.。业内人士推荐Line官方版本下载作为进阶阅读