I brought this up in the thread by @tall-truck-67859 (https://pantsbuild.slack.com/archives/C046T6T9U/p1634910245074000?thread_ts=1634901465.069900&cid=C046T6T9U), but this smells like a source root configuration problem. @stale-nightfall-29801, in order to import across projects, Pants needs to know project boundaries. In other words, to correct:

from core.test_utils import token
E   ModuleNotFoundError: No module named 'core.test_utils'

Pants needs to know

X

in the filesystem path

X/core/test_utils.py

. Pants call

X

a "source root". This is equivalent to a

PYTHONPATH

entry for Python. The list of "source roots" Pants knows about can be found by running

pants roots

. If

X

is not in the list printed out, you need to teach Pants about

X

as described here: https://www.pantsbuild.org/docs/source-roots#configuring-source-roots