JSON.md

JSON Module

What is it?

The json library can parse JSON from strings or files. The library parses JSON into a Python dictionary or list. It can also convert Python dictionaries or lists into JSON strings.

How to use?

Take the following string containing JSON data:

json_string = '{"first_name": "Guido", "last_name":"Rossum"}'

It can be parsed like this:

import json
parsed_json = json.loads(json_string)

and can now be used as a normal dictionary:

print(parsed_json['first_name'])
"Guido"

You can also convert the following to JSON:

d = {
    'first_name': 'Guido',
    'second_name': 'Rossum',
    'titles': ['BDFL', 'Developer'],
}

print(json.dumps(d))
'{"first_name": "Guido", "last_name": "Rossum", "titles": ["BDFL", "Developer"]}'

Example

Python Dictionaries to JSON Strings

Code:

import json 
student = {"101":{"class":'V', "Name":'Rohit',  "Roll_no":7}, 
         "102":{"class":'V', "Name":'David',  "Roll_no":8},  
         "103":{"class":'V', "Name":'Samiya', "Roll_no":12}}  
print(json.dumps(student)); 

Output

{"103": {"class": "V", "Name": "Samiya", "Roll_no": 12}, 
"102": {"class": "V", "Name": "David", "Roll_no": 8}, 
"101": {"class": "V", "Name": "Rohit", "Roll_no": 7}}

JSON Strings to Python Dictionaries

Code:

import json 
json_data = '{"103": {"class": "V", "Name": "Samiya", "Roll_n": 12}, "102": {"class": "V", "Name": "David", "Roll_no": 8}, "101": {"class": "V", "Name": "Rohit", "Roll_no": 7}}'; 
print(json.loads(json_data)); 

Output:

{"103": {"class": "V", "Name": "Samiya", "Roll_no": 12}, 
"102": {"class": "V", "Name": "David", "Roll_no": 8}, 
"101": {"class": "V", "Name": "Rohit", "Roll_no": 7}}