immediate: If True and the internal value is already not None, return immediately. Defaults to True.
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，这一点在体育直播中也有详细论述
遇到一个复杂的正则表达式或者是算法题，对着Google搜了半小时，结果复制过来的代码自己都看不懂，最后只能硬着头皮问同事。，详情可参考PDF资料
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