Pip fails to install satisfiable requirements due to bug in backjumping optimization #12317
Description
Description
On Python 3.9 Linux pip fails to install with the following requirements:
pandas>=1.3.5,<=1.4.0
pystac>=1.8.2,<=1.8.3
pystac-client>=0.3.2,<=0.3.3
sat-stac<=0.1.1
Expected behavior
Should install the satisfiable requirements:
pandas==1.3.5
pystac==1.8.3
pystac-client==0.3.3
sat-stac==0.1.1
pip version
23.2.1
Python version
3.9
OS
Linux
How to Reproduce
python3.9 -m venv .venv
source .venv/bin/activate
python -m pip install pip --upgrade
pip install "pandas>=1.3.5,<=1.4.0" "pystac>=1.8.2,<=1.8.3" "pystac-client>=0.3.2,<=0.3.3" "sat-stac<=0.1.1"
Output
INFO: pip is looking at multiple versions of pystac-client to determine which version is compatible with other requirements. This could take a while.
ERROR: Cannot install pystac-client==0.3.2 and pystac<=1.8.3 and >=1.8.2 because these package versions have conflicting dependencies.
The conflict is caused by:
The user requested pystac<=1.8.3 and >=1.8.2
pystac-client 0.3.2 depends on pystac~=1.2.0
To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict
ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/topics/dependency-resolution/#dealing-with-dependency-conflicts
Code of Conduct
- I agree to follow the PSF Code of Conduct.
Context
This is a regression since Pip 23.1 which vendored resolvelib which included this change to backtracking: sarugaku/resolvelib#113
There is already an issue on resolvelib side: sarugaku/resolvelib#134
But given this has a bigger impact because it causes Pip to fail to install requirements when there is a valid solution I feel there should be an issue on Pip side until it is resolved.