A war trumpet was used by Celtic tribes across Europe to intimidate their enemies and to inspire and direct warriors during battle.
No implicit type coercion. An int does not silently become a float. A float does not silently become a string. All conversions are explicit function calls — float_from_string, int(x), and so on. This prevents an entire category of subtle bugs where silent coercion produces unexpected results.
，这一点在PDF资料中也有详细论述
println(f"\nTotal value: {tree_sum(tree)}");，更多细节参见新收录的资料
苹果官方对 MacBook Neo 的期待，更多放在了中小学生群体。一台扬声器够大声，屏幕够清晰，金属机身耐造，系统干净纯粹，还玩不了太多游戏的 MacBook Neo，完全适合给孩子上网课做作业，平时休闲娱乐。如果家长用的是 iPhone，那管理起来更是方便。
此外，我们重视进入场景，也是因为可以通过真干活的数据飞轮，把真机数据转起来。