Hello! I'm facing a problem installing dalex in Metaflow 2.12.5 using @pypi_base. I wrote:

@pypi_base(
packages={
"dalex": "1.7.2",
...
},
python="3.12.6",
)

But when Metaflow bootstraps the virtual environment, I get:

ERROR: Could not find a version that satisfies the requirement dalex==1.7.2

(from versions: 0.1.0, 0.1.2, ..., 0.2.0)

It seems that Micromamba / Metaflow is only seeing the old dalex versions (0.1.x → 0.2.0), even though dalex 1.7.2 exists on PyPI and installs fine outside Metaflow. For example, if I run locally:

pip install dalex==1.7.2

It works perfectly, but inside Metaflow’s Micromamba environment it fails. It looks like Metaflow 2.12.5 with Python 3.12 + Micromamba cannot find the dalex 1.7.x wheel!!

I believe it is because it is only available as a .tar.gz and not a wheel. Are you trying cross platform?

In our case, deploying to AWS Step Functions uses linux based containers and dalex 1.7.x cannot be installed because it is only available as a source distribution, not a pre-built wheel. So, Metaflow environment lacks the necessary build tools to compile it. is there any workaround.

you can build it into an image for the step that needs dalex and pass that into your

@batch

decorator call https://docs.metaflow.org/api/step-decorators/batch

Thanks guys, that was helpful.