json file creation from multiple dictionaries in python

Question

I have 3 different types of properties like below

devices
iphone
ipad
ipod
watch

city
NY
SFO
LA
NJ

Company
Apple
Samsung
Walmart

Now I want create a json file using the properties.

For example for devices I have done like below.

I created a dictionary manually in python like below.

device_dict = {'device1': 'iphone', 'device2': 'ipad', 'device3': 'ipod', 'device4': 'watch'}

Then converted the dictionary to a json file like below.

import json
out_file = open("test.json","w")
json.dump(my_dict,out_file, indent=4)                                    
out_file.close()

I am able to create 3 separate json like below but How can I do for all the 3 properties into a single file.

The easiest solution is to create either a list of the three dicts, or a dict of the three dicts, and json.dump that. — abarnert
– abarnert, Commented May 10, 2018 at 21:27
For example: big_dict = {'device': device_dict, 'city': city_dict, 'company': company_dict} then json.dump(big_dict, out_file, indent=4). — abarnert
– abarnert, Commented May 10, 2018 at 21:28
(Although I'm not sure why your device_dict is a dict rather than a list in the first place…) — abarnert
– abarnert, Commented May 10, 2018 at 21:29
@abarnert I am still learning Python when i looked online I found articles to create json from dict mostly. I thought that is the easy way arround. Could you please let me know how I can create json file using lists — User12345
– User12345, Commented May 10, 2018 at 21:32

Reut Sharabani · Accepted Answer · 2018-05-10 21:31:42Z

1

JSON allows list structures, so, without knowing what its for, the best way to save it in my opinion is as such:

data = {
    'devices': ['iphone', 'ipad', 'ipod', 'watch'],
    'cities': ['NY', 'SFO', 'LA', 'NJ'],
    'companies': ['Apple', 'Samsung', 'Walmart']
}

There is no point in naming something device1 when its obvious that it is the first item in the list of devices. When you want the value of the first device:

device1 = data['devices'][0]

This stores all the information in a format you can parse easily.

answered May 10, 2018 at 21:31

Reut Sharabani

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