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.
统筹发展和安全，有效防范化解各类风险挑战；，这一点在币安_币安注册_币安下载中也有详细论述
，这一点在体育直播中也有详细论述
一大早，浙江衢州市柯城区白云街道新湖社区党总支书记朱华芳便开始在社区里“串巷”，跟晨练的居民拉起家常。
https://feedx.net，这一点在一键获取谷歌浏览器下载中也有详细论述