I have a project set up like

src/python/thing-i-am-working-on/module.py
src/python/some-other-thing/other_module.py

when I try to run

pants setup-py src/python/thing-i-am-working-on::

I get this error and I’m not sure what to do about it

FAILURE: No exported target owner found for PythonLibrary(BuildFileAddress(src/python/some-other-thing/BUILD, some-other-thing))

Any thoughts on what could be going on here?

@cold-journalist-66984: Sorry for the trouble. “exported” means “has a provides clause that declares where it is exported to”

So do all of the sibling projects need to have a provides clause? For context, there is a root BUILD file at

src/python

and one in each of the sibling projects as well.

no: there is some neat magic there. the task will walk the dependencies of something exportable

So that means my project must have a dependency on the sibling project that I’m not aware of yet, because it’s looking at that project, or am I misunderstanding something?

dependencies are required in Pants, yes… independent of setup_py or not, multiple targets must declare that they depend on one another

Great, thanks for all your help!

sure thing! if you’re just getting started on a python project, the new docsite will guide you through using the “v2” engine, which provides a nicer experience there: https://pants.readme.io/docs/

Hmm and that reminds me that I should update https://pants.readme.io/docs/python-setup-py-goal with more details about how ownership works in that arena

+1 … it’s pretty neat actually.