动态设置深Python字典 [英] Dynamically set deep python dict

问题描述

我有一个列表，表示一个字典中的图层:

I have a list that represents the layers in a dict:

layers = ('layer1', 'layer2', 'layer3')

我要根据此动态创建一个字典，如下所示:

I want to dynamically create a dictionary out of this that looks like this:

data = {'layer1': {'layer2': {'layer3': ...}}}

我希望能够在三个点的位置插入一个值.我还希望能够使用layers列表动态访问此值.

I want to be able to insert a value at the position of the three dots. I also want to be able to dynamically access this value using the layers list.

推荐答案

因此，我提出了一个替代解决方案，该解决方案使用for循环而不是递归地调用该函数.我对这两种方法进行了基准测试，结果发现循环方法随着增加层和函数调用的数量而变得更快.

So I made an alternative solution that uses for loops instead of calling the function recursively. I benchmarked both approaches and the loop method turns out to be way faster as you increase the amount of layers and function calls.

def create_deep_dict(value, layers):

    orig_data = {}
    data = orig_data
    last_layer = layers[-1]

    for layer in layers[:-1]:
        data[layer] = {}
        data = data[layer]

    data[last_layer] = value

    return orig_data

def deep_dict_value(data, layers):

    for layer in layers:
        data = data[layer]

    return data

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