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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.，更多细节参见heLLoword翻译官方下载
刘奇 刘俊臣 信春鹰（女） 钟山 娄勤俭 孔绍逊 汪洋。业内人士推荐搜狗输入法作为进阶阅读
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except RuntimeError: