Pants v2: Fast, consistent builds for Python and more

Welcome to the Pants v2 documentation hub!

Pants v2 is a fast, scalable build system for growing codebases. It's currently focused on Python, with support for other languages coming soon.

Here you'll find guides to help you get started with Pants v2, comprehensive documentation on how to configure, run and customize Pants v2, and information on how to get help from the Pants community.

Get Started

Initial configuration

Creating the initial pants.toml config file.

Pants has a robust options system, allowing you to configure hundreds of options. Every Pants option can be set via a command-line flag, an environment variable, or, most commonly, a config file.

The options system is described in detail here. This page will set up your initial Pants config file.

Creating the config file

Pants configuration lives in a file called pants.toml in the root of the repo. This file uses the TOML format.

If you haven't yet, create a pants.toml file:

[GLOBAL]
pants_version = "$PANTS_VERSION"

where $PANTS_VERSION is the version of Pants you want to pin your repo to. When you'd like to upgrade Pants, edit pants_version and the ./pants script will self-update on the next run.

Configuring source roots

Some project layouts use top-level folders for namespace purposes, but have the code live underneath. However, the code's imports will ignore these top-level folders, thanks to mechanisms like the $PYTHONPATH, the JVM classpath, and the $GOROOT. For example, to import the file src/my_project/app.py, many projects use import my_project.app, rather than import src.my_project.app. Source roots are how Pants understands these imports.

By default, Pants recognizes having no source root, or having src, src/python, or src/py as source roots. If your project has a different structure, see Source roots for how to configure them, and for examples of different project structures with Pants.

Enabling Backends

Most Pants functionality is provided via pluggable backends. You enable a backend by listing it under the backend_packages config key in pants.toml.

For example, to enable Python support:

[GLOBAL]
...
backend_packages = ["pants.backend.python"]

Updated 9 days ago


Initial configuration


Creating the initial pants.toml config file.

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