The Ultimate Guide to Python Programming With Python 3.10 - .sort(key) - Sorting Arrays of Class Objects

The video tutorial covers the implementation of a cart system in Python, focusing on sorting products by price. It begins with an introduction to the store package, including product and cart classes. The tutorial then demonstrates how to define a sort method in the cart class, addressing type errors encountered during sorting. A lambda function is used to sort products by their price attribute. The tutorial also includes creating a show method to display sorted products with proper formatting. Finally, it concludes with refining the cart display and ensuring the sorting functionality works as intended.

What is the primary reason for the initial sorting error in the cart?

• Python does not know how to compare custom product objects.

• The cart class does not exist.

• The sort method is not called correctly.

• The products are not added to the cart.

How can we instruct Python to sort custom objects like products?

• By defining a key function that returns a comparable attribute.

• By using a predefined sort method.

• By converting objects to strings before sorting.

• By using a different programming language.

What is the purpose of the lambda function in sorting products?

• To create a new product object.

• To print product details.

• To define a temporary function for sorting based on price.

• To delete products from the cart.

What does the show method primarily do?

• Adds new products to the cart.

• Displays products with their prices using formatted output.

• Sorts products in descending order.

• Deletes products from the cart.

How are the product titles and prices aligned in the show method?

• Both titles and prices are left-aligned.

• Titles are left-aligned, and prices are right-aligned.

• Both titles and prices are right-aligned.

• Titles are centered, and prices are left-aligned.

What is the result of sorting the products in the cart?

• Products remain unsorted.

• Products are sorted alphabetically by title.

• Products are sorted in ascending order of price.

• Products are sorted in descending order of price.

Which function is used to sort the products by price?

• A predefined sort function without a key.

• A lambda function as a key in the sort method.

• A custom compare function.

• A built-in Python function for sorting strings.