大家好，欢迎来到 Crossin 的编程教室。你有没有在别人的Python代码中看到过，有些变量或方法前面多了一个下划线 _，比如下面这个例子：class User: def __init__(self, name, age): self.name ...

我在Python教学的过程中发现：几乎所有的编程学习者在开始用函数不久之后，都踩过局部变量的坑。几乎每个星期，都会有人在答疑群问到关于作用域使用不当而导致的问题。（前两天我在知识星球里刚回答了一个） ...

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Unsurprisingly, her 9-year-old is already a kick-ass D&D dungeon master.