文章解析了 Python 中 `itertools.permutations` 使用的排列算法，揭示了其作为回溯算法的循环形式，并提供了原始递归版本的实现。
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链接：https://nekonull.me/posts/py-itertools-permutation-algo/Python 自带了许多工具库，其中 Python 2.3 （2007）引入的 itertools 提供了一系列迭代相关函数。itertools.permutation 可以得到一个输入迭代器的所有排列，但其使用的算法却少有解析。本文探究了这一算法的工作原理，发现这其实是一个回溯算法的循环形式，并重新实现了其原始递归版本。
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