hi, is there a way to use inheritance in constraints.txt with pants. Basically, jupyter needs a few different packages for Windows and Linux. I have a common constraints.txt and I am "inheriting" from it in linux-constraints.txt and windows-constraints.txt (i.e.

-r constraints.txt

). pants.toml points to linux-constraints.txt but it complains that constraints.txt does not exist. I tried to add constraints.txt as resources but the issue persists. I had a look here https://www.pantsbuild.org/docs/python-third-party-dependencies but i did not find any options for

python_requirements

that would help. I know pants is Linux only, but imho there are justified use cases for inheritance in requirements files like the one above (better than duplicating the constraints).

No there is not. This is sort of related to https://github.com/pantsbuild/pants/issues/11165, but even then I think not quite the same

somehow related but this is more of a single set of requirements stemming from multiple files

How are you inheriting? Are you able to get that working with stand-alone Pex and pip?

• constraints.txt

pytest==...
pandas==...

• windows-constraints.txt

-r constraints.txt
pywin==...

• linux-constraints.txt

-r constraints.txt
few linux only deps==...

Here, you're treating your

constraints.txt

as a requirements file, rather than a constraints file. Instead, Pants is doing the equivalent of

pip install -c constraints.txt req1 req2

. I suspect the

-r constraints.txt

would be ignored in that case with pip too

thanks

Pex works with all that too.

Doesn't pants support the union of multiple lockfiles?

Doesn't pants support the union of multiple lockfiles?

No, you can only specify a single constraints file with the

[python-setup]

option. I originally implemented it to work with multiple, but John very rightfully encouraged keeping it simple until we better understood the semantics of multiple

Reasonable