How to substitute the path to an element from a string?

Question

Python

Hey!
There is a script that receives JSON and the path to the desired element as input,
for example:

path = "['fields']['components']['name']"
json = {'fields': {'components': {'id': '10437', 'name': 'Bug'}}}

then if you call such code, it does not work
print(json[path])

Traceback (most recent call last):
  File "<pyshell#17>", line 1, in <module>
    print(json[path])
KeyError: "['fields']['components']['name']"

the path itself is not known until it comes to the script. how to make that it was possible to pull out on the way value?

Answer 1

path = "fields.components.name".split('.')
json = {'fields': {'components': {'id': '10437', 'name': 'Bug'}}}

for p in path:
    json = json[p]
print(json)

Answer 2

import re

value = json
for key in re.findall("'(.*?)'", path):
    value = value[key]

or

import re
from functools import reduce

value = reduce(lambda c, k: c[k], re.findall("'(.*?)'", path), json)

Answer 3

path = "['fields']['components']['name']"
json = {'fields': {'components': {'id': '10437', 'name': 'Bug'}}}

print (eval('json' + path + ''))