defaultdict的核心原理是它在初始化时接受一个工厂函数（factory function），这个函数用于生成默认值。当访问一个不存在的键时，defaultdict会调用这个工厂函数来生成默认值，并将其插入到字典中。这使得defaultdict在处理图算法、计数器等需要频繁检查键是否存在的场景时，比普通字典更加高效和简洁。

AUSTIN, TX – Katana Graph, an AI-powered graph intelligence company, has announced the release of a high-performance graph analytics Python library in collaboration with Intel. Katana Graph has ...

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'Coding skills are a basic literacy these days,' TI's Balyta said. The Texas Instruments calculator – an iconic gadget – is getting an upgrade. And this time, it’s coming with a popular language. The ...