Get own pyproject.toml dependencies programatically

Question

I use a pyproject.toml file to list a package's dependencies:

[build-system]
requires = ["setuptools"]
build-backend = "setuptools.build_meta"

[project]
name = "foobar"
version = "1.0"
requires-python = ">=3.8"
dependencies = [
  "requests>=2.0",
  "numpy",
  "tomli;python_version<'3.11'",
]

Is is possible, from within the package, to get the list of its own dependencies as strings? In the above case, it should give

["requests", "numpy"]

if used with Python>=3.11, and

["requests", "numpy", "tomli"]

otherwise.

Answer 1

Something along the lines of the following should do the trick:

import importlib.metadata
import packaging.requirements

def _get_dependencies(name):
    rd = metadata(name).get_all('Requires-Dist')
    deps = []
    for req in rd:
        req = packaging.requirements.Requirement(req)
        if req.marker is not None and not req.marker.evaluate():
            continue
        deps.append(req.name)
    return deps

References:

• https://docs.python.org/3/library/importlib.metadata.html#distribution-metadata
• https://importlib-metadata.readthedocs.io/en/latest/api.html#importlib_metadata.metadata
• https://packaging.pypa.io/en/stable/requirements.html