medium Exception Handling

Custom Exception for Inventory

The Brief

StockKeeper — a warehouse management SaaS — has a bug report: generic `ValueError`s from their stock service are indistinguishable from other validation errors in their logging pipeline. Introduce a domain-specific exception so the ops team can filter for stock-related failures.

Acceptance Criteria

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2 Write a function remove_stock(inventory, sku, qty) that mutates the inventory dict

1 Define a custom exception InsufficientStockError that inherits from Exception

3 Raise InsufficientStockError with a helpful message if qty exceeds the current stock

4 Demonstrate catching the custom exception in a try/except block

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solution.py

Python 3

# StockKeeper — custom exception

class InsufficientStockError(Exception):
    pass


def remove_stock(inventory, sku, qty):
    pass  # TODO: implement


# TODO: demonstrate success and a caught InsufficientStockError
inventory = {"SKU-100": 5, "SKU-200": 12}

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