Python JSON for Beginners Exercises With Answers

Which function parses a JSON string into Python values?

1. json.parse
2. json.read
3. json.dumps
4. json.loadscorrect

Answer: json.loads

Why: loads stands for load string; it parses JSON text.

Which function turns a Python dictionary into JSON text?

1. json.encode
2. json.loads
3. json.dumpscorrect
4. json.write

Answer: json.dumps

Why: dumps stands for dump string; it serialises a value to JSON text.

What Python type does a JSON object become?

1. A dictionarycorrect
2. A list
3. An integer
4. A string

Answer: A dictionary

Why: JSON objects have named keys, so they map naturally to dictionaries.

What does json.loads('{"a": 1}')["a"] return?

1. None
2. "a"
3. A list
4. 1correct

Answer: 1

Why: The JSON object becomes a dictionary, and key a holds the number 1.

Complete the import statement for Python's JSON module.

import ____

Answer: json

Why: The module is imported with import json.

Complete the function that parses JSON text.

data = json.____(text)

Answer: loads

Why: json.loads parses a string containing JSON.

Complete the function that serialises a value to JSON text.

text = json.____(data)

Answer: dumps

Why: json.dumps returns a JSON-formatted string.

Complete the key that contains the list of records.

for item in data["____"]:
    print(item)

Answer: items

Why: The example JSON stores its records under the key items.

What appears on the screen?

import json
print(json.loads('{"a": 1}')["a"])

Answer: 1

Why: The parsed dictionary stores 1 under key a.

What is printed?

import json
print(json.dumps({"a": 1}))

Answer: {"a": 1}

Why: dumps returns compact JSON text with double quotes.

What is the output?

import json
data = json.loads('{"items": [2, 4]}')
print(data["items"][1])

Answer: 4

Why: Index 1 selects the second item in the list.

What does this code print?

import json
data = {"items": [1, 2, 3]}
print(sum(data["items"]))

Answer: 6

Why: sum adds the three values in the list.