We’ve put together a guide that breaks down the basics, from what Python is all about to how you can actually start using it. You can even grab a python tutorial pdf to have handy. So, whether you’re ...

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In Python, a SyntaxError happens when the interpreter finds code that does not conform to the rules of the Python language.

Ubuntu is a free computer system, like Windows or macOS, but it’s built by a community. It’s great for programmers because it’s very flexible and has lots of tools already built-in that help you code.

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。