A utility to fetch and download python packages
This project exists as the last piece to complete the puzzle of a package manager. The other pieces are:
- resolvelib - Resolves concrete dependencies from a set of (abstract) requirements.
- unearth (This project) - Finds and downloads the best match(es) for a given requirement.
- build - Builds wheels from the source code.
- installer - Installs packages from wheels.
They provide all the low-level functionalities that are needed to resolve and install packages.
The core functionality is basically extracted from pip. However, pip is not designed to be used as a library and hence the API is not very stable.
Unearth serves as a stable replacement for pip's PackageFinder API. It will follow the conventions of Semantic Versioning so that downstream projects can use it to develop their own package finding and downloading.
unearth requires Python >=3.8
$ python -m pip install --upgrade unearthGet the best matching candidate for a requirement:
>>> from unearth import PackageFinder
>>> finder = PackageFinder(index_urls=["https://pypi.org/simple/"])
>>> result = finder.find_best_match("flask>=2")
>>> result.best
Package(name='flask', version='2.1.2')Using the CLI:
$ unearth "flask>=2"
{
"name": "flask",
"version": "3.0.0",
"link": {
"url": "https://files.pythonhosted.org/packages/36/42/015c23096649b908c809c69388a805a571a3bea
6046
44362fe87e33fc3afa01f/flask-3.0.0-py3-none-any.whl",
"comes_from": "https://pypi.org/simple/flask/",
"yank_reason": null,
"requires_python": ">=3.8",
"metadata": "https://files.pythonhosted.org/packages/36/42/015c23096649b908c809c69388a805a571a3bea44362fe87e33fc3afa01f/flask-3.0.0-py3-none-any.whl.metadata"
}
}