What is variable scope, and how did we manage without it before? This topic is essential for understanding the following subjects: Closures and Decorators. I assure you that this topic will be both enjoyable and practical. You will gain knowledge about local, nonlocal, and global variables.

Global Variable

Local Variable

Challenge: Modifying a Global Variable

Nested Functions

Nonlocal Variable

Closures

Challenge: Threshold Checker

5. Decorators

This section provides an in-depth exploration of Python decorators, a powerful feature that allows for the modification and enhancement of function behavior. Participants will learn how to write their own decorators, understand built-in decorators, and apply decorators in practical scenarios.

Introduction to Decorators

Syntax

Challenge: Create Your Decorator

Decorators with Parameters

Chaining Decorators

Challenge: Basic Smores Recipe

Practical Examples of Decorator Usage

Arguments Overview

First of all, let’s learn what positional, keyword, and optional arguments are.

The example above uses positional arguments. If you pass a different number of arguments, an error will occur. To call the function func(1, 2, 3), you just pass the arguments by their positions. The positional argument is a mandatory one.

Also, you can pass arguments using names. And there are keyword arguments. In this case, you do not need to follow the order of the arguments.

After giving a default value to the argument, it becomes an optional one. So, you may pass it, and if not, the function will use the default value.

¿Todo estuvo claro?

Sección 2. Capítulo 1