.tox/py3/lib/python3.7/site-packages/swh/graph/tests/test_luigi.py:9: in <module> from swh.graph.luigi import CompressGraph .tox/py3/lib/python3.7/site-packages/_pytest/assertion/rewrite.py:168: in exec_module exec(co, module.__dict__) .tox/py3/lib/python3.7/site-packages/swh/graph/luigi.py:65: in <module> import luigi E ModuleNotFoundError: No module named 'luigi'