How does Python deal with memory management? Learn the ins and outs of Python's garbage collection system and how to avoid its pitfalls. Python grants its users many conveniences, and one of the ...

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。

Putting a list into random order might seem like an unusual task, but it can be quite useful for many businesses. For example, you might want to randomly assign leads to salespeople, assign jobs to ...

Video: Dr Blake Miller discusses his LSE-PKU Summer School course. The massive amount of data available online continues to increase the bounds of scientific inquiry. Researchers in both academia and ...