Convert object to json string

object_to_json.py

import json


def json_dumps_handler(data):
  has_dict = isinstance(data, object) and hasattr(data, '__dict__')
  if not has_dict:
    raise TypeError()
  return data.__dict__


class Root:
  def a(self):
    return True

class Node:
  pass


root = Root()
root.ham = 1
root.spam = 'hoge'
root.node = Node()
root.nodes = (Node(),Node(),Node())

print(json.dumps(root, default=json_dumps_handler, indent=2))