Python rules

This repo is a plugin that provides python rules for the Please build system.

Basic usage

# BUILD
# This adds the plugin to your project
github_repo(
    name = "python_rules",
    repo = "please-build/python-rules",
    revision = "<Some git tag, commit, or other reference>",
)

# src/main/python/build/please/foo/BUILD
# This defines a python library that can be depended on by other python rules
python_library(
    name = "foo",
    srcs = ["foo.py"],
    visibility = ["//src/test/python/build/please/..."]
)

# src/test/python/build/please/foo/BUILD
# A test for the above library
python_test(
    name = "foo_test",
    srcs = ["foo_test.py"],
    deps = [
        "//src/main/python/build/please/foo",
    ]
)

# src/main/python/build/please/foo/BUILD
# This produces an executable pex file
python_binary(
    name = "pybin",
    main = "pybin.py",
    deps = ["//src/main/python/build/please/foo"]
)

Add the following to your .plzconfig

[Parse]
PreloadSubincludes = @python_rules//build_defs:python

Alternatively, if you are not using python everywhere, you can simply put subinclude("@python_rules//build_defs:python") at the top of individual BUILD files as needed.

Configuration

Plugins are configured under a Plugin heading like so:

[Plugin "python"]
DefaultInterpreter = python3

The available configuration options are:

[Plugin "python"]
InterpreterOptions = -b
InterpreterOptions = -s
DefaultInterpreter = python3
PexTool = //tools/please_pex
TestRunner = unittest
Debugger = pdb
ModuleDir = third_party.python
WheelRepo = https://pypi.org/pypi
WheelNameScheme = None
WheelTool = //tools/wheel_resolver
TestRunnerDeps = //third_party/python:unittest_bootstrap
PipTool = ""
DefaultPipRepo = ""
UsePypi = True
PipFlags = ""
DisableVendorFlags = False

Compatibility

This plugin is compatible with the same operating systems as Please itself:

• Darwin (amd64, arm64)
• FreeBSD (amd64)
• Linux (amd64, arm64)

and is compatible with the following Python versions:

• 3.10
• 3.11 (as of python-rules v1.7.0)
• 3.12 (as of python-rules v1.7.0)
• 3.13 (as of python-rules v1.8.0)
• 3.14 (as of python-rules v1.14.0)

Whenever possible, we aim to ensure the plugin works with all of the supported Python branches. Please report any bugs you encounter when building, testing or running Python code under one of these versions.

Unsupported versions

The following Python versions are no longer supported by this plugin:

• 3.8 (last supported by python-rules v1.7.4)
• 3.9 (last supported by python-rules v1.14.0)

Outputs that this plugin generates may not run correctly under these Python versions, or may run with significantly reduced performance.