article hierarchy node 商品层次结构节点
These four are sufficient for our purposes, and I will use this hierarchy in the rest of the article.
对于这我们的目的来说，这四个已经足够了，在文章的剩余部分我将用到这个层次划分。
The third article in this series, " Exploring the Python type hierarchy, Introducing Strings," introduces the Python string, which is also an immutable sequence, but only for character data.
本系列的第三篇文章 探索 Python 类型的层次结构 —— 使用字符串 介绍了 Python string，这也是一个不可变的序列，但仅针对字符数据。
The fourth article in this series, " Discover Python, Part 4: Explore the Python type hierarchy," introduced the Python list.
探索 Python 类型的层次结构” 介绍了 Python list。
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