Installation of plum-dispath as a requirement via setup.py

We are having trouble to use plum-dispatch as a dependency in my own project. We include plum-dispatch as a requirement in our setup.py, but unfortunately the automatic installation fails with

Searching for plum-dispatch
Reading https://pypi.org/simple/plum-dispatch/
Downloading https://files.pythonhosted.org/packages/aa/ce/3467306a9bd3e3e7fe4450f87f283e9f997f0646a410d716296db9bfa3ad/plum-dispatch-1.0.0.tar.gz#sha256=766da66a93d0f00911777175dc7a43235ee3f18ead34c73977e710f732a918fd
Best match: plum-dispatch 1.0.0
Processing plum-dispatch-1.0.0.tar.gz
Writing /tmp/easy_install-s90fi7cu/plum-dispatch-1.0.0/setup.cfg
Running plum-dispatch-1.0.0/setup.py -q bdist_egg --dist-dir /tmp/easy_install-s90fi7cu/plum-dispatch-1.0.0/egg-dist-tmp-9fh6ov4j
warning: the 'license_file' option is deprecated, use 'license_files' instead
error: Setup script exited with error: unknown file type '.py' (from 'plum/function.py')
Error: Process completed with exit code 1.

I am no expert with setuptools, but it seems to me as if license_file instead of license_files in the setup.cfg is causing issues.

Installing plum-dispatch before hand via pip pip install plum-dispatch is a work around without problems though.

[PhilipVinc]

I don’t think it can be that…

license_file has been deprecated in April in favour of license_files (see https://github.com/pypa/setuptools/issues/2620 ). That’s just a deprecation warning.

The problem is with

> error: Setup script exited with error: unknown file type '.py' (from 'plum/function.py')

I think it’s not picking up the Cython dependency correctly.

EDIT: I am 99% positive about that. I had the same error when submitting the conda-forge recipe until I realised that plum depends on Cython, but that is not a declared dependency.

[wesselb]

Glad to hear you found a satisfactory solution!