Python标准库中有平衡二叉树的模块吗?

发布于 2024-08-22 09:06:35 字数 201 浏览 4 评论 0原文

是否有用于 AVL 树红黑树或Python标准库中其他类型的平衡二叉树?

Is there a module for an AVL tree or a red–black tree or some other type of a balanced binary tree in the standard library of Python?

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看轻我的陪伴 2024-08-29 09:06:35

不,stdlib 中没有平衡二叉树。但是,从您的评论来看,您似乎还有其他选择:

  • 您说您想要 BST 而不是用于 O(log n) 搜索的列表。如果您只需要搜索并且数据已经排序,则 bisect 模块提供列表的二分搜索算法。
  • Mike DeSimone 推荐了集合和字典,您解释了为什么列表在算法上太慢。集合和字典被实现为哈希表,其查找时间为 O(1)。 Python 中大多数问题的解决方案实际上是“使用字典”。

如果这两种解决方案都不适合您,您将不得不使用第三方模块或实现您自己的模块。

No, there is not a balanced binary tree in the stdlib. However, from your comments, it sounds like you may have some other options:

  • You say that you want a BST instead of a list for O(log n) searches. If searching is all you need and your data are already sorted, the bisect module provides a binary search algorithm for lists.
  • Mike DeSimone recommended sets and dicts and you explained why lists are too algorithmically slow. Sets and dicts are implemented as hash tables, which have O(1) lookup. The solution to most problems in Python really is "use a dict".

If neither solution works well for you, you'll have to go to a third party module or implement your own.

疯了 2024-08-29 09:06:35

在一些情况下,我找到了 heapq 包 (在 stadndard 库中)很有用,特别是在任何给定时间您希望 O(1) 访问集合中最小元素的时间。

对我来说,我正在跟踪一组计时器,通常只是想检查最小的时间(首先执行的时间)是否已经准备好。

There have been a few instances where I have found the heapq package (in the stadndard library) to be useful, especially if at any given time you want O(1) access time to the smallest element in your collection.

For me, I was keeping track of a collection of timers and was usually just interested in checking if the smallest time (the one to be executed first) was ready to go as of yet.

予囚 2024-08-29 09:06:35

另请查看排序容器项目。

这是 PyCon 的讨论:https://www.youtube.com/watch?v=7z2Ki44Vs4E< /a>

Check out also the Sorted Containers project.

Here's a PyCon talk about it: https://www.youtube.com/watch?v=7z2Ki44Vs4E

去了角落 2024-08-29 09:06:35

有一个名为“bintrees”的新软件包,它支持 ubalanced、AVL 和 RB 树。您可以在此处找到它。

There is a new package called "bintrees" which supports ubalanced, AVL and RB trees. You can find it here.

深巷少女 2024-08-29 09:06:35

不,但是有 Python 的 AVL 树对象 (非常旧!)和 SourceForge 上的一个(已关闭)项目 - avl-trees for Python

No, but there's AVL Tree Objects for Python (very old!) and a (closed) project on SourceForge - avl-trees for Python.

微暖i 2024-08-29 09:06:35

我写了一个Python版本的Java TreeMap/TreeSet,其底层数据结构是平衡二叉树(准确地说是红黑树)。

源代码和文档可以在此存储库中访问

您可以使用pip install pytreemap.
测试 Python >=3.5

I wrote a Python version of the Java TreeMap/TreeSet, of which the underlying data structure is a balanced binary tree (Red-Black tree to be precise).

Source code and documentation can be accessed in this repo

You can install with pip install pytreemap.
Tested for Python >=3.5

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