Installation fails for mahotas on linux-aarch64

[ligaz]

Installing the mahotas library fails on ARM linux distros with:

  RuntimeError

  Unable to find installation candidates for mahotas (1.4.12)

  at ~/.local/share/pypoetry/venv/lib/python3.7/site-packages/poetry/installation/chooser.py:73 in choose_for
       69│             links.append(link)
       70│ 
       71│         if not links:
       72│             raise RuntimeError(
    →  73│                 "Unable to find installation candidates for {}".format(package)
       74│             )
       75│ 

Installation works with pip:

$ python3.7 -m pip install mahotas

Poetry has been installed with:

$ curl -sSL https://install.python-poetry.org | python3.7 -

Any ideas?

[clintonroy]

If you check out https://pypi.org/project/mahotas/#files you can see there's no source distribution and no arm build. Pip is probably downloading 1.4.11, which does have a source dist.

try poetry add mahotas==1.4.11

[ligaz]

Indeed that seems to be the case. Thanks for your reply!

Do you think poetry should behave similarly (use a the latest version with source distribution if there are no pre-built binaries for the current architecture) in such cases?

[abn]

I would say not. Because when the lockfile is resolved, it is done based on version constraints. We do not know in advance what platforms need to be supported or if the version intentionally does not distribute sdists.

If we were to enable this configuration for projects then yes we can do it.

That said, this only really applies when using poetry install. You can still pip install your project and the frontend can choose what it wants to do if the dependency constraint is met.

[clintonroy]

I dunno to be honest. It's better in some regards, worse in others.