Errors, files and libraries · Lesson 20 of 25

Exchanging data with JSON

Convert JSON strings to dictionaries and back.

8 minutes2 games

JSON is a text format for data exchange, not Python code. json.loads converts a string to Python objects, and json.dumps converts back. JSON true and null become Python True and None.

Python

import json

raw = '{"name": "Mona", "scores": [80, 95], "active": true}'
student = json.loads(raw)
print(student["name"])
print(sum(student["scores"]))
print(json.dumps({"passed": True, "note": None}, sort_keys=True))

Tool	Use
`loads` / `dumps`	String ↔ object
`load` / `dump`	File ↔ object

What's the output?

import json
print(json.loads('{"ok": true}')["ok"])

What will this code print?

Exercise

Decode the JSON and print price plus tax.

Expected output: 114

Python

import json
raw = '{"price": 100, "tax": 14}'

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Python

Errors, files and libraries · Lesson 20 of 25

Exchanging data with JSON

Convert JSON strings to dictionaries and back.

8 minutes2 games

JSON is a text format for data exchange, not Python code. json.loads converts a string to Python objects, and json.dumps converts back. JSON true and null become Python True and None.

Python

import json

raw = '{"name": "Mona", "scores": [80, 95], "active": true}'
student = json.loads(raw)
print(student["name"])
print(sum(student["scores"]))
print(json.dumps({"passed": True, "note": None}, sort_keys=True))

Tool	Use
`loads` / `dumps`	String ↔ object
`load` / `dump`	File ↔ object

What's the output?

import json
print(json.loads('{"ok": true}')["ok"])

What will this code print?

Exercise

Decode the JSON and print price plus tax.

Expected output: 114

Python

import json
raw = '{"price": 100, "tax": 14}'

Learn more from

Played 0 of 2 games