I have a project that looks like: |--> Common/Common/foo.py |--> Specific/Specific/bar.py "from common.foo import ..." |--> Specific/Tests/conftest.py "from specific.bar import ..." Source roots are set to common and specific If I package up bar.py as a pex and run it all the imports work fine, however when I try and run the tests the specific "from common.foo import ..." import fails with no module named common.foo. I could use any pointers on what I might need to configure to get it to work as I have run out of ideas.

Are you using pants to run tests too?

Yes

And all of these packages have an

___init___.py

?

Yeah

so the dunder init files should only be inside

Common/Common

and same goes for Specific

Ah yeah that seems to have sorted it. Thanks!

Worth understanding namespace packaging https://packaging.python.org/en/latest/guides/packaging-namespace-packages/

I think it would be nice if Pants could be able to detect this issue and provide helpful hints, though.. 🙂

Agreed, I still run into this type of problem a lot when I'm not thinking about it