decode.py

import json



class ObjectEncoder(json.JSONEncoder):
	def default(self, o):
		return o.__dict__


class Address:
	def __init__(self, street, city, state, zip):
		self.street = street
		self.city = city
		self.state = state
		self.zip = zip

	@staticmethod
	def from_dict(address_dict):
		'''
		Makes an Address object from a dict instance that was decoded from JSON

		usage: Address.from_dict(...)
		'''
		street = address_dict['street']
		city = address_dict['city']
		state = address_dict['state']
		zip = address_dict['zip']
		return Address(street, city, state, zip)

	def __repr__(self):
		return f"Address({self.street}, {self.city}, {self.state} {self.zip})"


class Person:
	def __init__(self, name, addresses):
		self.name = name
		self.addresses = addresses

	@staticmethod
	def from_dict(person_dict):
		'''
		Makes a Person object from a dict instance that was decoded from JSON

		usage: Person.from_dict(...)
		'''
		name = person_dict['name']
		addresses = []
		for address_dict in person_dict['addresses']:
			addresses.append(Address.from_dict(address_dict))
		return Person(name, addresses)

	def __repr__(self):
		return f"Person({self.name}, {self.addresses})"



filename = 'person1.json'

with open(filename, 'w') as fp:
	json.dump(Person('Dude Duderson', [Address('1600 Pennsylvania Ave NW', 'Washington', 'DC', 20500)]), fp, cls=ObjectEncoder)

with open(filename, 'r') as fp:
	person_dict = json.load(fp)
	print(f"person_dict: {person_dict}")
	p = Person.from_dict(person_dict)
	print(f"Person: {p}")

Output:

person_dict: {'name': 'Dude Duderson', 'addresses': [{'street': '1600 Pennsylvania Ave NW', 'city': 'Washington', 'state': 'DC', 'zip': 20500}]}
Person: Person(Dude Duderson, [Address(1600 Pennsylvania Ave NW, Washington, DC 20500)])