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Comment and Documentation in Python

Comments and documentation are crucial parts of writing clean and maintainable code in Python. They help explain what the code does, why certain decisions were made, and how to use different parts of the code. Here’s a detailed overview:

1. Single-Line Comments

Single-line comments in Python start with the # symbol. Everything following # on that line is considered a comment.


2. Multi-Line Comments

Multi-line comments can be created by consecutive single-line comments or by using triple quotes (''' or """). Although triple quotes are technically multi-line strings, they are often used for comments.

Consecutive Single-Line Comments:


Triple Quotes:


3. Documentation Strings (Docstrings)

Docstrings are special strings used to document modules, classes, functions, and methods. They are written using triple quotes and can be accessed using the __doc__ attribute.

Module Docstring:

Place the docstring at the top of the module.


Function Docstring:

Place the docstring at the beginning of the function.


Class Docstring:

Place the docstring at the beginning of the class.


4. Inline Comments

Inline comments are used to explain a specific part of a line of code. They are placed on the same line, separated by at least two spaces from the code.


Best Practices for Comments and Documentation

  1. Keep Comments Relevant and Up-to-Date: Ensure comments accurately describe what the code does. Outdated comments can be misleading.
  2. Avoid Redundant Comments: Don’t state the obvious. Comments should provide additional context that isn’t immediately clear from the code itself.
  3. Use Docstrings for Documentation: Use docstrings for documenting modules, classes, functions, and methods. This helps in generating documentation automatically using tools like Sphinx.
  4. Write Clear and Concise Comments: Comments should be clear, concise, and written in proper English. Use complete sentences and proper grammar.
  5. Follow PEP 257: Follow the PEP 257 conventions for writing docstrings, which include recommendations on docstring formatting and style.
This module includes a module-level docstring, function docstrings, and inline comments where necessary, making the code easy to understand and maintain.

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