将字符串转换为嵌套字典 [英] Converting a string to a nested dictionary

问题描述

我有一个字符串，我想将其转换为Python中的嵌套字典.

I have a string which I want to convert to a nested dictionary in Python.

示例输入:

import copy
diff_str = "/pathConstraint/latency/latencyValue"
value = "low"
diff_arr = diff.split("/")
final_temp_dict = dict()
for elem in reversed(diff_arr):
    if len(final_temp_dict) == 0:
        final_temp_dict.setdefault(elem, value)
    else:
        temp_final_dict = copy.deepcopy(final_temp_dict)
        final_temp_dict.setdefault(elem, temp_final_dict)
    print (final_temp_dict)

运行此程序时，我遇到错误，但没有得到预期的输出.

While running this I face an error and I'm not getting the expected output.

所需的输出为嵌套字典:

The output needed is as a nested dictionary:

{"pathConstraint" : {"latency" : {"latencyValue" : "low"}}}

推荐答案

您可以使用以下递归函数:

You could use the following recursive function:

def string_to_dict(keys, value):
    key = keys.split('/')
    if len(key) == 2:
        return {key[1]: value}
    else:
        return string_to_dict('/'.join(key[:-1]), {key[-1]: value})

输出:

>>> string_to_dict(diff_str, value)
{'pathConstraint': {'latency': {'latencyValue': 'low'}}}

请注意，这假定 diff_str 以/字符开头.

Note that this assumes that diff_str begins with a / character.

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