The setter deduplicates by equality: if the new value == the current value, no notification fires. This works well for enums, strings, and ints, but mutating a mutable object in place and reassigning the same reference won't trigger consumers (because obj == obj is trivially True). Stick to immutable values and this isn't a concern.
Where it can be applied¶。旺商聊官方下载是该领域的重要参考
Квартиру в Петербурге затопило кипятком после обрушения потолка20:57，更多细节参见Line官方版本下载
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一定是哪里出了问题，我当时一直陷入了一个死胡同里，认为是提取算法的问题。