Add functional assertions to Python code.

Incorporate logic-validating assertions into a provided Python code snippet.

Prompt

Act as an expert Python developer. Your task is to add a relevant assertion to this code: {{PASTE YOUR PYTHON CODE HERE}}. Please respond in {{INPUT THE OUTPUT LANGUAGE HERE, E.G., ENGLISH}}. Use a technical writing style that is precise, objective, and structured for maximum clarity. Avoid personal opinions or unnecessary jargon, ensuring all information is accurate and adheres to industry standards.