addressbook.proto

syntax = "proto3";

package tutorial;

message BillingAddress {
  string address1 = 1;
  string address2 = 2;
}

message Person {
  string name = 1;
  int32 id = 2;
  string email = 3;

  enum PhoneType {
    MOBILE = 0;
    HOME = 1;
    WORK = 2;
  }

  message PhoneNumber {
    string number = 1;
    PhoneType type = 2;
  }

  repeated PhoneNumber phones = 4;
  BillingAddress billing_address = 5;
}

message AddressBook {
  repeated Person people = 1;
}

main.py

from proto.address_book_pb2 import Person
from google.protobuf.json_format import MessageToJson, Parse, MessageToDict


def main():
    person = Person()
    person.id = 1234
    person.name = "John Doe"
    person.email = "[email protected]"
    phone = person.phones.add()
    phone.number = "555-4321"
    phone.type = Person.HOME

    billingAddress = person.billing_address
    billingAddress.address1 = "89 Mexfield Rd"
    billingAddress.address2 = "London"

    print(person)
    # print(MessageToJson(person))

    # person2 = Person()
    json = MessageToJson(person, preserving_proto_field_name=True)
    person2 = Parse(json, Person())
    print(person2)

    print("Dictionary")
    print(MessageToDict(person, preserving_proto_field_name=True))


if __name__ == "__main__":
    # execute only if run as a script
    main()

output.json

{
  "name": "John Doe",
  "id": 1234,
  "email": "[email protected]",
  "phones": [
    {
      "number": "555-4321",
      "type": "HOME"
    }
  ],
  "billing_address": {
    "address1": "89 Westminster Rd",
    "address2": "London"
  }
}