#0074

Total Values From JSON Records

MediumPython20 min15 XP

Problem

Given a JSON string representing a list of records and a numeric key, return the sum of that key across records. Missing keys count as 0.

Why This Matters

APIs, logs, configs, and notebooks often exchange JSON. You need to parse first, then reason over ordinary Python dictionaries.

Function Signature

def total_json_key(text, key):

Examples

Example 1

Input'[{"amount": 10}, {"amount": 5}, {"name": "x"}]', "amount"

Output15

The third record does not have amount, so it contributes 0.

Constraints

Input JSON is valid.
The top-level value is a list of objects.
Missing keys count as zero.

CodePython

def total_json_key(text, key):
    """
    Input example: '[{"amount": 10}, {"amount": 5}, {"name": "x"}]', "amount"
    Return: 15
    Return the value from the function so the tests can compare it. Do not print unless the prompt asks.
    """
    # write your code here
    return 0

def total_json_key(text, key):
    """
    Input example: '[{"amount": 10}, {"amount": 5}, {"name": "x"}]', "amount"
    Return: 15
    Return the value from the function so the tests can compare it. Do not print unless the prompt asks.
    """
    # write your code here
    return 0

Visible browser tests run here when available.

Testcases1 visible / 3 hidden categories

Missing key contributes zero

InputJSON list and key amount

Expected15

Only records with amount add to the total.

Hidden Test Categories

empty listnegative valuesdifferent key name