pyproject-metadata 0.9.0b1

PEP 621 metadata parsing

pyproject-metadata

Dataclass for PEP 621 metadata with support for core metadata generation

This project does not implement the parsing of pyproject.toml containing PEP 621 metadata.

Instead, given a Python data structure representing PEP 621 metadata (already parsed), it will validate this input and generate a PEP 643-compliant metadata file (e.g. PKG-INFO).

Usage

After installing pyproject-metadata, you can use it as a library in your scripts and programs:

from pyproject_metadata import StandardMetadata

parsed_pyproject = { ... }  # you can use parsers like `tomli` to obtain this dict
metadata = StandardMetadata.from_pyproject(parsed_pyproject, allow_extra_keys = False)
print(metadata.entrypoints)  # same fields as defined in PEP 621

pkg_info = metadata.as_rfc822()
print(bytes(pkg_info).decode("utf-8"))  # core metadata

METADATA 2.4

If project.license is a string or project.license-files is present, then METADATA 2.4+ will be used. A user is expected to validate and normalize metadata.license with an SPDX validation tool, such as the one being added to packaging. Add something like this:

if isinstance(metadata.license, str):
    metadata.license = packaging.licenses.normalize_license_expression(metadata.license)

A backend is also expected to copy entries from project.licence_files, which are paths relative to the project directory, into the dist-info/licenses folder, preserving the original source structure.