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Python 如何监听 List 长度
source link: https://www.v2ex.com/t/874515
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如题，想要监听一个 List 的长度，当长度发生变化时，执行某些逻辑。 但是又不想每次改变的时候都启动一个线程（开销太大了）
有什么办法可以实现吗？
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