json object_hook

json_missing.py

import urllib.request
import json
from pprint import pprint

class Dic42(dict):
  def __missing__(self, key):
    return '42'
  
url = 'https://graph.facebook.com/fmasanori'
resp = urllib.request.urlopen(url).read()
data = json.loads(resp.decode('utf-8'),
                  object_hook = Dic42)
pprint (data)
print ()
print ('Ultimate answer:', data['Ultimate answer'])