It is important both to easily grasp the design choice and the code structure of a project even long after it has been completed. The documentation process starts by commenting the code. Code comments are usually intended for software developers and aim at clarifying the code by giving details of how it works. They are usually performed using inline or multiple lines comments using the language syntax.

Single Line Comments

As we’ve seen before, we can add single-line comments to our Python programs using a hash symbol # before a line in our source file:


Finally, Python also includes a secondary type of comment that spans multiple lines, specifically for creating documentation. A docstring is usually the first line of text inside of a class or method definition, and is surrounded by three double quotes """ with one set of three on each end.

These comments are specifically designed to provide information about classes and methods in our code. Here’s a quick example using a simple class:

Unfortunately, Python does not enforce a particular style for these docstrings, so there are many different formats used in practice. To learn more, we can consult the following references.