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pyproject.toml: project table

The metadata is specified in a standards-based format:

[project]
name = "package"
description = "A great package."
readme = "README.md"
license.file = "LICENSE"
authors = [
  { name = "My Name", email = "me@email.com" },
]
maintainers = [
  { name = "My Organization", email = "myemail@email.com" },
]
requires-python = ">=3.8"

dependencies = [
  "typing_extensions",
]

classifiers = [
  "Development Status :: 4 - Beta",
  "License :: OSI Approved :: BSD License",
  "Programming Language :: Python :: 3 :: Only",
  "Programming Language :: Python :: 3.8",
  "Programming Language :: Python :: 3.9",
  "Programming Language :: Python :: 3.10",
  "Programming Language :: Python :: 3.11",
  "Programming Language :: Python :: 3.12",
  "Topic :: Scientific/Engineering :: Physics",
]

[project.urls]
Homepage = "https://github.com/organization/package"
Documentation = "https://package.readthedocs.io/"
"Bug Tracker" = "https://github.com/organization/package/issues"
Discussions = "https://github.com/organization/package/discussions"
Changelog = "https://package.readthedocs.io/en/latest/changelog.html"

You can read more about each field, and all allowed fields, in packaging.python.org, Flit or Whey. Note that "Homepage" is special, and replaces the old url setting.

Extras

It is recommended to use extras instead of or in addition to making requirement files. These extras a) correctly interact with install requires and other built-in tools, b) are available directly when installing via PyPI, and c) are allowed in requirements.txt, install_requires, pyproject.toml, and most other places requirements are passed.

Here is an example of a simple extras:

[project.optional-dependencies]
tests = [
  "pytest >=6.0",
]
mpl = [
  "matplotlib >=2.0",
]

Self dependencies can be used by using the name of the package, such as dev = ["package[test,examples]"], but this requires Pip 21.2 or newer. We recommend providing at least test and docs.

Command line

If you want to ship an "app" that a user can run from the command line, you need to add a script entry point. The form is:

[project.scripts]
cliapp = "package.__main__:main"

The format is command line app name as the key, and the value is the path to the function, followed by a colon, then the function to call. If you use __main__.py as the file, then python -m followed by the module will also work to call the app (__name__ will be "__main__" in that case).