Python Json

All tasks assume you use:

import json

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📦 Python JSON – 20 Basic Assignments

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1) Import and Print json Module

Write a simple script that imports json and prints json.dumps and json.loads to verify import.

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2) Convert Dict to JSON String

Create a Python dictionary like:

data = {"name": "Alice", "age": 20}

Convert it to a JSON string using json.dumps() and print.

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3) Convert List to JSON

Convert the Python list:

[1, 2, 3, 4]

to JSON with json.dumps().

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4) Convert JSON String to Dict

Take JSON string:

'{"name":"Bob","age":22}'

Convert it to a Python dict using json.loads() and print.

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5) Write Dict to JSON File

Create a dictionary and save it to a file named data.json.

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6) Read JSON from File

Read the data.json file created in #5 and print its Python object.

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7) Pretty-Print JSON

Convert a dict to JSON with indentation (indent=4) and print.

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8) Update Value in JSON

Given JSON string:

'{"name":"Sam","age":25}'

Convert to Python, update age to 26, and print updated dict.

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9) JSON with Nested Dict

Create a nested dict:

{"user": {"name":"Amy","city":"Toronto"}}

Convert it to JSON string.

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10) JSON Array to Python List

Convert JSON array:

'[10,20,30]'

to a Python list and print.

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11) JSON with Boolean

Convert this into JSON:

{"success": True}

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12) JSON with None

Convert this Python dict to JSON:

{"message": None}

Observe how None becomes null in JSON.

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13) Validate JSON Format

Ask the user for a JSON string and use json.loads() inside a try/except to print whether it’s valid.

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14) JSON Keys and Values

Given a JSON string, convert to dict and print all keys and then all values separately.

Example:

'{"a":1, "b":2}'

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15) Nested JSON Parsing

Given nested JSON:

'{"team": {"name":"Dev","members":[1,2,3]}}'

Convert and access the list of members.

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16) Append to JSON List

Start with a JSON string representing a list:

'[1,2,3]'

Convert to Python list, append 4, then convert back to JSON and print.

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17) Remove Key from JSON

Convert this JSON:

'{"a":1,"b":2,"c":3}'

to dict. Remove key b, then convert back to JSON.

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18) JSON Formatting Options

Convert a list of dictionaries with json.dumps(..., sort_keys=True) and print.

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19) Read JSON File and Update

Read data.json, add a new key-value "updated": True, and write back to the same file.

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20) Compare Two JSON Strings

Ask user for two JSON strings. Parse both and print whether they represent the same Python object.

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🧠 Concepts Practiced

Topic	What You Learn
Converting Python → JSON	json.dumps()
Converting JSON → Python	json.loads()
File I/O with JSON	json.dump() / json.load()
Pretty JSON	indent formatting
Error handling	Catch invalid JSON
Nested structures	Read/modify nested JSON data

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📌 Starter Code Snippets

Python → JSON

import json

data = {"name": "Alice", "age": 20}
json_str = json.dumps(data)
print(json_str)

JSON → Python

import json

s = '{"name":"Bob","age":22}'
obj = json.loads(s)
print(obj)

Write to File

import json

with open("data.json", "w") as f:
    json.dump(data, f)

Read from File

import json

with open("data.json") as f:
    loaded = json.load(f)
print(loaded)

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canvil: 333f6c7d-6876-4f7e-b6ad-1bdb2233f5c1