Assignment Overview

Expand the functionality of the To$-$Do application by incorporating due dates, priorities, descriptions, and categories $($with the ability to add and delete items within categories$).$

Assignment Specifications

To$-$Do List Structure:

Each to$-$do item will be a list of the form.

$[$due$\_$date, priority, description, category$]$

The main to$-$do list will thus be a list of these item lists.

Functionality: Your application is designed to manage a dynamic to$-$do list along with a customizable category list, offering users the ability to organize tasks effectively. Below is a detailed guide on the core functionalities to implement:

Add Category: Finish implementing the add$\_$category function to add a new category to the category list $($categories$).$

Delete Category: Finish implementing the remove$\_$category function to delete an item from the category list.

Add Item: Enhance the add$\_$task function to add new tasks to the to$-$do list. Note that tasks should only be added if they are assigned a valid, pre$-$defined category. If an undefined category is given, the to$-$do list should remain unchanged to ensure that all tasks are appropriately categorized.

Delete Item: Finish implementing the remove$\_$task function to delete an item from the todo list by its index.

Error Handling: Implement robust error handling to address potential user actions that could disrupt the application's functionality. The application should gracefully manage the following scenarios:

Attempting to delete a non$-$existent item $($e$.$g$.,$ an out$-$of$-$range index error$).$

Attempting to add a task under a category that has not been defined.

Attempting to delete a category that does not exist within the current category list.

Attempting to add a new category that duplicates an existing one.