Now, let's create the function's docstring (documentation string).

Docstring in Python is a documentation string that is used to describe the purpose and behavior of a function, module, or class. It is a string that is placed at the beginning of the function or module or class, enclosed in triple quotes """...""" and can span multiple lines:

def add(a: int, b: int) -> int:
    """This function receives two integer arguments and returns its sum."""
    return a + b
  
print(add(21, 5))

How this hint looks without **docstring**:

The **docstring** is a brief description of your function.

> Note
>
> **Annotations** and **Docstrings** are used in real development. Some simple actions can save a lot of time for other developers.

Want to level up your Python skills? Dive into the world of Python Best Practices for crafting code that's not only error-free but also a breeze to read and collaborate on. Let's embark on this journey together and master the art of creating clean, friendly, and downright awesome Python code that's a joy for you and your fellow devs to work with!

Let's consider annotations. Annotations are used in our code to make it more understandable for other developers. It's time to learn how we can help other developers to understand our code.

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Virtual Environment (venv) is an isolated development environment that helps projects to isolate their interpreter and modules. It's essential for every developer to learn how to use venv, so let's get started.