.tox/py3/lib/python3.7/site-packages/swh/model/tests/generate_testdata_from_disk.py:10: in <module> from swh.model.from_disk import Directory, DentryPerms .tox/py3/lib/python3.7/site-packages/swh/model/from_disk.py:20: in <module> from . import model .tox/py3/lib/python3.7/site-packages/swh/model/model.py:13: in <module> from attrs_strict import type_validator E ModuleNotFoundError: No module named 'attrs_strict'