Nested dictionary value from key path

Question

Get the value from a nested dictionary with the help of key path, here is the dict:

json = {
    "app": {
        "Garden": {
            "Flowers": {
                "Red flower": "Rose",
                "White Flower": "Jasmine",
                "Yellow Flower": "Marigold"
            }
        },
        "Fruits": {
            "Yellow fruit": "Mango",
            "Green fruit": "Guava",
            "White Flower": "groovy"
        },
        "Trees": {
            "label": {
                "Yellow fruit": "Pumpkin",
                "White Flower": "Bogan"
            }
        }
    }

The input parameter to the method is the key path with dots separated, from the key path = "app.Garden.Flowers.white Flower" need to print 'Jasmine'. My code so far:

import json
with open('data.json') as data_file:    
  j = json.load(data_file)


def find(element, JSON):     
  paths = element.split(".")  
  # print JSON[paths[0]][paths[1]][paths[2]][paths[3]]
  for i in range(0,len(paths)):
    data = JSON[paths[i]]
    # data = data[paths[i+1]]
    print data



find('app.Garden.Flowers.White Flower',j)

Answer 1

This is an instance of a fold. You can either write it concisely like this:

from functools import reduce
import operator

def find(element, json):
    return reduce(operator.getitem, element.split('.'), json)

Or more Pythonically (because reduce() is frowned upon due to poor readability) like this:

def find(element, json):
    keys = element.split('.')
    rv = json
    for key in keys:
        rv = rv[key]
    return rv

j = {"app": {
    "Garden": {
        "Flowers": {
            "Red flower": "Rose",
            "White Flower": "Jasmine",
            "Yellow Flower": "Marigold"
        }
    },
    "Fruits": {
        "Yellow fruit": "Mango",
        "Green fruit": "Guava",
        "White Flower": "groovy"
    },
    "Trees": {
        "label": {
            "Yellow fruit": "Pumpkin",
            "White Flower": "Bogan"
        }
    }
}}
print find('app.Garden.Flowers.White Flower', j)