This segment details the initial logic for deleting a post from an in-memory array in Python, acknowledging that this is a simplified approach before implementing a real database. The speaker discusses different ways to achieve this, highlighting the trade-offs between simplicity and efficiency. This tutorial demonstrates deleting posts in a FastAPI application. It uses a DELETE request with the post ID. The code finds the post's index, removes it using `.pop()`, and returns a 204 status code (no content). Error handling is added to return a 404 if the post ID doesn't exist. The example uses an in-memory array; a database would be used in production. This segment focuses on error handling when attempting to delete a post with a non-existent ID. The speaker demonstrates how to implement an `if` statement to check for the existence of the post before attempting to delete it, raising a 404 HTTP exception with a descriptive message if the post is not found. The improved error handling ensures a more robust and user-friendly experience.