/usr/lib/python3.7/importlib/__init__.py:127: in import_module return _bootstrap._gcd_import(name[level:], package, level) <frozen importlib._bootstrap>:1006: in _gcd_import ??? <frozen importlib._bootstrap>:983: in _find_and_load ??? <frozen importlib._bootstrap>:953: in _find_and_load_unlocked ??? <frozen importlib._bootstrap>:219: in _call_with_frames_removed ??? <frozen importlib._bootstrap>:1006: in _gcd_import ??? <frozen importlib._bootstrap>:983: in _find_and_load ??? <frozen importlib._bootstrap>:967: in _find_and_load_unlocked ??? <frozen importlib._bootstrap>:677: in _load_unlocked ??? .tox/py3/lib/python3.7/site-packages/_pytest/assertion/rewrite.py:170: in exec_module exec(co, module.__dict__) .tox/py3/lib/python3.7/site-packages/swh/indexer/metadata_dictionary/__init__.py:5: in <module> from . import cff, codemeta, maven, npm, python, ruby <frozen importlib._bootstrap>:983: in _find_and_load ??? <frozen importlib._bootstrap>:967: in _find_and_load_unlocked ??? <frozen importlib._bootstrap>:677: in _load_unlocked ??? .tox/py3/lib/python3.7/site-packages/_pytest/assertion/rewrite.py:170: in exec_module exec(co, module.__dict__) .tox/py3/lib/python3.7/site-packages/swh/indexer/metadata_dictionary/cff.py:15: in <module> class CffMapping(DictMapping, SingleFileMapping): .tox/py3/lib/python3.7/site-packages/swh/indexer/metadata_dictionary/cff.py:32: in CffMapping def normalize_authors(self, d: list[dict]) -> Union[list, dict[str, list]]: E TypeError: 'type' object is not subscriptable