these are called containers. Examples of containers are tuples, lists and dictionaries. The references are part of a container's value. In most cases, when we talk about the value of a container, we imply the values, not the identities of the contained objects;
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Dictionaries and lists 字典和列表
Note that the values in a list or dictionary don't have to be all of the same type; you can mix strings, Numbers, and even nested lists and dictionaries if you wish.
注意，列表或字典中的值不一定必须是相同的类型；可以混合使用字符串、数字，甚至是嵌套的列表或字典，如果需要的话。
In the next two articles, we'll explore the use of much more powerful and convenient data structures: ordered lists and random-access dictionaries.
在接下来两篇文章中，我们将探讨更强大、更方便的数据结构的应用：有序列表和随机访问字典。
In contrast to lists, tuples, and dictionaries, which may contain heterogeneous elements, Numarray arrays contain only elements of a homogeneous data type.
与可以包含不同类型元素的列表、元组和词典不同的是，Numarray数组只能包含同一类型的数据。
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