customdict.py

import json


class customdict(dict):
    def __getattr__(self, name):
        if name not in self:
            raise AttributeError
        
        return self[name]
    
    def __setattr__(self, name, value):
        self[name] = value
        
        
with open("example.json", "r") as f:
    data = json.load(f, object_hook=customdict)