Validate a nested order schema

Python data engineering interview problem. Difficulty: intermediate. Pattern: Dictionaries. About 15 minutes. Part of the Pro drill bank.

Orders arrive as nested dicts. A validator should catch a missing required field before the order is written to the warehouse.

Validate a nested order object and report the missing field the tests expect.

Requirements

• Walk required paths (customer, items, amounts, …).
• Return the missing field name, or a success sentinel.

Constraints

• order: a nested dict.

Examples

Input: missing_order_field({'id': '1', 'customer': {'email': 'a@b.c'}, 'items': [{'sku': 'X', 'qty': 1}]}) Output: None This input follows the stated rules and produces this output.

Topics: lakebench, python, nested-structures.

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