将列表转换为嵌套字典 [英] Converting list to nested dictionary

问题描述

如何将列表转换成嵌套的`字典'？

How can I convert a list into nested `dictionary'?

例如：

l = [1, 2, 3, 4] 

我想把它转换成一个如下所示的字典：

I'd like to convert it to a dictionary that looks like this:

{1: {2: {3: {4: {}}}}}

推荐答案

您还可以使用 functools.reduce 为此。

You could also use functools.reduce for this.

reduce(lambda cur, k: {k: cur}, reversed(l), {})

演示

>>> from functools import reduce
>>> l = [1, 2, 3, 4]

>>> reduce(lambda cur, k: {k: cur}, reversed(l), {})
{1: {2: {3: {4: {}}}}}

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建筑流程看起来像

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The flow of construction looks something like

{4: {}} -> {3: {4: {}} -> {2: {3: {4: {}}}} -> {1: {2: {3: {4: {}}}}}

as reduce 遍历反向迭代器，创建一个新的单元素dict。

as reduce traverses the reverse iterator making a new single-element dict.

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