Black notes that this is however a temporary measure, so we run with it off.
#BLACK PYTHON FORMATTER CODE#
In safe mode Black will check that the reformatted code produces a valid AST that is equivalent to the original, so you can be sure it hasn’t inadvertently changed the behaviour of your code. Running the tool generated a 40,000 line diff! There are two ways to run Black, -fast or -safe. Our core backend Python API codebase is a 200,000 line monolith. Implementing Black on an existing codebase was the most time consuming part of this task. Once we agreed to use Black, it was a case of formatting the existing codebase, and then running with it. Python Black has a set of rules and it implements them without question. That’s it! The best part about this was not having to agree any standards as a team, no discussing optimal line length, no single quotes vs.
#BLACK PYTHON FORMATTER HOW TO#
The main benefits of this are the time saved having to think about how to format your code, and the time saved in pull requests from your colleagues suggesting their code preference. In essence you write whatever code you want with any formatting you like, and when you commit, a pre-commit hook kicks in and re-formats your code automatically to a consistent style. If you write software, or work with people who write software, then this is hopefully starting to sound appealing already. This introductory paragraph from the black repo sums up perfectly why we wanted to implement such a tool “speed”, “freedom from nagging”, and “saving time and mental energy”. You will save time and mental energy for more important matters. In return, Black gives you speed, determinism, and freedom from pycodestyle nagging about formatting. By using it, you agree to cede control over minutiae of hand-formatting. We wanted to reduce the time spent correcting each other and discussing code formatting while continuing to achieve a consistent, quality code style.īlack is the uncompromising Python code formatter.
However, agreeing on and enforcing these standards can be a productivity drain when writing code, during code reviews, and when on-boarding new staff. Readability of a codebase can affect the long term productivity of a team which is why organisations often agree standards amongst developers to ensure consistency. If you want to fix bugs or add features, you can read log:Ĭolorful: in python-black.log in the /Log directory.Implementing Python Black on a Legacy CodebaseĬode formatting is a contentious but important subject. If you want to disable format_on_save in a project that does not use black code style #14, you need to add the configuration to *.sublime-project:
:warning: If you don't want to generate a pyproject.toml for each project, then you need to create a black global configuration file. Opens the configuration file if it already exists. Python-black: Create Black Configuration FileĬreates a pyproject.toml file in the root of the project with basic options. You can quickly generate a black configuration file for the current project.
This can also be toggled via Preferences > Package Settings > Python Black > Format On Save.
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