I’m trying to incrementally adopt pants in a project that currently defines all of its dependencies in setup.py (

install_requires

,

extras_require

, etc.) Does pants offer a way to generate

python_requirement

targets for my third party dependencies from the existing setup.py file? Similar to the `python_requirements`/`poetry_requirements` generators?

Interesting idea, there is no such way at the moment.

maybe https://setuptools.pypa.io/en/latest/deprecated/distutils/apiref.html#distutils.core.run_setup? it’s deprecated though

If you have a variable for

install_requires

et al. which is set in the script before being passed into the

setup

function, you can

exec

the file and store the local variables into a dictionary. You could do that in a plugin, probably, or at least print them out without requiring deprecated distutils

Here's what I did

def gather_install_requires() -> List[str]:
    req_file = pathlib.Path(__file__).parent / 'requirements.txt'
    return [
        req for req in req_file.read_text().splitlines()
        if not (req.startswith('#') or 'git+ssh' in req)
    ]

Then I just call that function inside

setup.py

like

install_requires=gather_install_requires()

. Hacky thing is removing some requirements for our internal repos that we list in that file.

An alternative might be to use setup.cfg (https://docs.python.org/3/distutils/configfile.html) which is the “standard” for declarative versions of the programmatic stuff in setup.py