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。

Python中的collections库是一个非常实用的工具库，是对基础数据结构的补充。1) collections.Counter 用于计数假设我们给定了一个字符串列表，需要计算列表 ...

使用collections库在python中引入高性能数据类型 本文作者： skura 2019-10-18 19:36 导语：python 就像一件艺术品 ...

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