then the += will modify the list, and then raise an exception because you can’t assign to that tuple item because the tuple is immutable, but the list will have been mutated.
全年粮食播种面积11941万公顷，比上年增加9万公顷。其中，稻谷播种面积2901万公顷，增加1万公顷；小麦播种面积2358万公顷，减少1万公顷；玉米播种面积4496万公顷，增加22万公顷；大豆播种面积1026万公顷，减少7万公顷。棉花播种面积298万公顷，增加14万公顷。油料播种面积1445万公顷，增加16万公顷。糖料播种面积149万公顷，增加3万公顷。
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"The platform is also unevenly moderated, and quality varies massively by community," say Oc.