Python exporting multiple data to a json file

Question

I'm working on an address book in python, and I'm trying to save the data (name, town & address) to a json file.

The problem's that when it saves to the json file, it creates a new object in the json file

example -

   {"Object1": {"Town": "town", "Address": "address"}}
   {"Object2": {"Town": "town", "Address": "address"}}

Because of that layout, I get this error whenever I try to do anything with it

Error -

    ValueError: Extra data: line 2 column 1 - line 2 column 55 (char 55 - 109)

How can I make my json file layout something like this

Example -

    {"Object1": {"Town": "town", "Address": "address", "Object2": {"Town": "town", "Address": "address"}}

Here's my code -

import json

class Object:
    name = "Name"
    address = "Address"
    town = "Town"

    def return_info(self):
        dictionary = {self.name: {"Address": self.address, "Town": self.town}}
        return dictionary

    def __init__(self, entered_name, entered_town, entered_address):
        self.name = entered_name
        self.town = entered_town
        self.address = entered_address

def update(file):
    with open("data.json", "a") as outfile:
        json.dump(file, outfile)

new_object = Object("name", "town", "address")
update(new_object.return_info())

Why do you want to save object inside an object? Wouldn't you save list of objects instead? — awesoon
– awesoon, Commented Apr 22, 2015 at 6:41

Namita Maharanwar · Accepted Answer · 2016-09-21 05:42:06Z

4

You can just maintain all addresses in a dict and then dump into a json file.

addressmap = {
    "Object1": {"town": "town", "address": "address"},
    "Object2": {"town": "town", "address": "address"}
}

with open("addresses.json", "w") as f:
    json.dump(addressmap, f, indent=4)

edited Sep 21, 2016 at 5:42

answered Apr 22, 2015 at 7:47

Namita Maharanwar

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Comments

EvenLisle · Accepted Answer · 2015-04-22 06:44:11Z

1

Your example of a desired object means having Object2 inside Object1, while it seems to me what you'd like is a list of your objects:

import json
dictlist = [{"Object1": {"Town": "town", "Address": "address"}},
            {"Object2": {"Town": "town", "Address": "address"}}]
with open("output.json", "w") as outfile:
  json.dump(dictlist, outfile)

answered Apr 22, 2015 at 6:44

EvenLisle

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3 Comments

Jonty Morris Over a year ago

This is sort of what I want.

Jonty Morris Over a year ago

But how could I then add/append to that

Jonty Morris Over a year ago

Something like how you do it with arrays - array.append()

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