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Various use examples

University of Wisconsin-Madison

Use Pixi with Binder for fully reproducible Binderized environments

c.f. https://github.com/matthewfeickert/pyhep-notebook-talk-example

Install ROOT globally from conda-forge with a pyroot alias

pixi global install root
pixi global expose add --environment root pyroot=python
$ root --version
ROOT Version: 6.36.04
Built for linuxx8664gcc on Oct 02 2025, 08:33:44
From tags/6-36-04@6-36-04
$ command -v root
/home/<user>/.pixi/bin/root
$ pyroot
Python 3.13.9 | packaged by conda-forge | (main, Oct 16 2025, 10:31:39) [GCC 14.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import ROOT
>>> ROOT
<module 'ROOT' from '/home/<user>/.pixi/envs/root/lib/python3.13/site-packages/ROOT/__init__.py'>
>>>

Create fully reproducible bespoke environments

pixi init example && cd example
pixi add coffea root sherpa mg5amcnlo
...
✔ Added coffea >=2025.10.2,<2026
✔ Added root >=6.36.4,<7
✔ Added sherpa >=2.2.16,<3
✔ Added mg5amcnlo >=3.5.7,<4
$ pixi list | wc -l
477

Setup bespoke environments on CVMFS with lb-conda (experimental)

On any machine with CVMFS mounted

$ pixi global install lbcondawrappers
└── lbcondawrappers: 0.5.2 (installed)
    └─ exposes: lb-conda, lb-conda-dev
$ lb-conda experimental/scikit-hep
bash-5.1$ conda list awkward
# packages in environment at /cvmfs/lhcbdev.cern.ch/conda/envs/experimental/scikit-hep/2025-06-13_11-40/linux-64:
#
# Name                    Version                   Build  Channel
awkward                   2.8.3              pyhe01879c_1    conda-forge
awkward-cpp               46              py313h00d2c3e_100    conda-forge
Reproducible reuse by default: Use of Pixi for software in (Py)HEP
Using CUDA conda packages with Pixi