#0129

Flatten a Dictionary One Level

MediumPython25 min20 XP

Problem

Given a dictionary, flatten only values that are dictionaries. Use parent.child keys for nested fields.

Why This Matters

Flattening one level is common when preparing JSON-like API data for tables or logs.

Function Signature

def flatten_one_level(data):

Examples

Example 1

Input{"user": {"id": 1, "name": "Asha"}, "active": True}

Output{"user.id": 1, "user.name": "Asha", "active": True}

Only the nested user dictionary is expanded.

Constraints

Return the exact requested structure.
Handle normal edge cases cleanly.
Prefer readable code over clever shortcuts.

CodePython

def flatten_one_level(data):
    """
    Input example: {"user": {"id": 1, "name": "Asha"}, "active": True}
    Return: {"user.id": 1, "user.name": "Asha", "active": True}
    Return the value from the function so the tests can compare it. Do not print unless the prompt asks.
    """
    # write your code here
    return {}

def flatten_one_level(data):
    """
    Input example: {"user": {"id": 1, "name": "Asha"}, "active": True}
    Return: {"user.id": 1, "user.name": "Asha", "active": True}
    Return the value from the function so the tests can compare it. Do not print unless the prompt asks.
    """
    # write your code here
    return {}

Visible browser tests run here when available.

Testcases1 visible / 3 hidden categories

Core example

Input{"user": {"id": 1, "name": "Asha"}, "active": True}

Expected{"user.id": 1, "user.name": "Asha", "active": True}

Only the nested user dictionary is expanded.

Hidden Test Categories

no nested dictionariesempty nested dictionarymultiple nested dictionaries