1.1 从代码文件到运行结果 第一章的目标很小：你要能写一个 .py 文件，运行它，并知道电脑为什么会给你一个结果。初学者常常急着问“列表和字典有什么区别”，但如果还没有建立“代码文件 -> 解释器 -> 输出结果”的闭环，后面所有语法都会漂在空中。

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