Print Simple Object Structure

EasyPython

Problem

Tipalti configuration objects can contain nested sections such as supplier onboarding, payment settings, and approval rules. Implement a function that renders the hierarchy of a nested object using two spaces for each indentation level.

The input is a nested Python dictionary. Each dictionary key represents a structure node. A value that is another dictionary contains child nodes. An empty dictionary represents a leaf node. Keys must be printed in their original insertion order, and every node must appear on its own line.

Return the complete formatted structure as a single string. Do not print directly from the function.

Formal Specification

Input: obj, a nested dictionary whose values are either dictionaries or None.
Output: A string containing one line per key, separated by newline characters.
Each key is preceded by two spaces multiplied by its nesting depth.
The root keys have depth 0.
A None value is a leaf and has no children.

Constraints

1 <= number of nodes <= 10^4
Keys are non-empty strings
Values are either nested dictionaries or None
The nesting depth is at most 500
Dictionary insertion order defines sibling order

Function Signature

def print_structure(obj):

Return the complete formatted structure as a single string. Do not print directly from the function.

Formal Specification

Input: obj, a nested dictionary whose values are either dictionaries or None.
Output: A string containing one line per key, separated by newline characters.
Each key is preceded by two spaces multiplied by its nesting depth.
The root keys have depth 0.
A None value is a leaf and has no children.