Ruff: A Modern Python Linter for Error-Free and Maintainable Code :

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June 17, 2024
Ruff: A Modern Python Linter for Error-Free and Maintainable Code
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Linting is essential to writing clean and readable code that you can share with others. A linter, like Ruff, is a tool that analyzes your code and looks for errors, stylistic issues, and suspicious constructs. Linting allows you to address issues and improve your code quality before you commit your code and share it with others.

Ruff is a modern linter that’s extremely fast and has a simple interface, making it straightforward to use. It also aims to be a drop-in replacement for many other linting and formatting tools, such as Flake8, isort, and Black. It’s quickly becoming one of the most popular Python linters.

In this tutorial, you’ll learn how to:

  • Install Ruff
  • Check your Python code for errors
  • Automatically fix your linting errors
  • Use Ruff to format your code
  • Add optional configurations to supercharge your linting

To get the most from this tutorial, you should be familiar with virtual environments, installing third-party modules, and be comfortable with using the terminal.

Take the Quiz: Test your knowledge with our interactive “Ruff: A Modern Python Linter” quiz. You’ll receive a score upon completion to help you track your learning progress:

Ruff: A Modern Linter for Error-Free and Maintainable Code

Interactive Quiz

Ruff: A Modern Python Linter

In this quiz, you'll test your understanding of Ruff, a modern linter for Python. By working through this quiz, you'll revisit why you'd want to use Ruff to check your Python code and how it automatically fixes errors, formats your code, and provides optional configurations to enhance your linting.

Installing Ruff

Now that you know why linting your code is important and how Ruff is a powerful tool for the job, it’s time to install it. Thankfully, Ruff works out of the box, so no complicated installation instructions or configurations are needed to start using it.

Assuming your project is already set up with a virtual environment, you can install Ruff in the following ways:

Shell 
$ python -m pip install ruff

In addition to pip, you can also install Ruff with Homebrew if you’re on macOS or Linux:

Shell 
$ brew install ruff

Conda users can install Ruff using conda-forge:

Shell 
$ conda install -c conda-forge ruff

If you use Arch, Alpine, or openSUSE Linux, you can also use the official distribution repositories. You’ll find specific instructions on the Ruff installation page of the official documentation.

Additionally, if you’d like Ruff to be available for all your projects, you might want to install Ruff with pipx.

You can check that Ruff installed correctly by using the ruff version command:

Shell 
$ ruff version
ruff 0.4.7

For the ruff command to appear in your PATH, you may need to close and reopen your terminal application or start a new terminal session.

Linting Your Python Code

While linting helps keep your code consistent and error-free, it doesn’t guarantee that your code will be bug-free. Finding the bugs in your code is best handled with a debugger and adequate testing, which won’t be covered in this tutorial. Coming up in the next sections, you’ll learn how to use Ruff to check for errors and speed up your workflow.

Checking for Errors

The code below is a simple script called one_ring.py. When you run it, it gets a random Lord of the Rings character name from a tuple and lets you know if that character bore the burden of the One Ring. This code has no real practical use and is just a bit of fun. Regardless of the size of your code base, the steps are going to be the same:

Read the full article at https://realpython.com/ruff-python/ »

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June 17, 2024 at 07:30PM
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