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  1. DZone
  2. Coding
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  4. Python: Reading a JSON File

Python: Reading a JSON File

In this post, a developer quickly guides us through the process of using Python to read files in the most prominent data transfer language, JSON.

By 
Mark Needham user avatar
Mark Needham
·
Apr. 10, 13 · Tutorial
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I’ve been playing around with some code to spin up AWS instances using Fabric and Boto and one thing that I wanted to do was define a bunch of default properties in a JSON file and then load this into a script.

I found it harder to work out how to do this than I expected to so I thought I’d document it for future me!

My JSON file looks like this:

config/defaults.json

{
	"region" : "eu-west-1",
	"instanceType": "m1.small"
}

To read that file we can do the following:

>>> open('config/defaults.json').read()
'{\n\t"region" : "eu-west-1",\n\t"instanceType": "m1.small"\n}'

We can then use the json.loads function to convert that from a string into a Python object:

>>> import json
>>> config = json.loads(open('config/defaults.json').read())
>>> config
{u'region': u'eu-west-1', u'instanceType': u'm1.small'}

We’d write the following code to get the region:

>>> config["region"]
u'eu-west-1'

I guess we might want to use a different approach that didn’t load the whole string into memory if we had a large JSON file, but, for my purposes, this will do!

JSON Python (language)

Published at DZone with permission of Mark Needham, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

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