Currently, I'm getting an error on Python 3.8 and 3.9 inpypa/build#820:

docker run --rm -it python:3.9 bashpip install toxgit clone https://github.com/pypa/buildcd buildtox -e py39 -- -k test_metadata_path_no_prepare -v

...File "/build/.tox/py39/lib/python3.9/site-packages/importlib_metadata/compat/py39.py", line 23, in normalized_namereturn Prepared.normalize(getattr(dist,"name",None)or dist.metadata['Name'])  File"/build/.tox/py39/lib/python3.9/site-packages/importlib_metadata/__init__.py", line889, innormalizereturn re.sub(r"[-_.]+","-", name).lower().replace('-','_')  File"/usr/local/lib/python3.9/re.py", line210, insubreturn _compile(pattern, flags).sub(repl, string, count)TypeError:expected string or bytes-like object

The problem isdist.__dict__={'_path': PosixPath('/build/tests/packages/test-no-prepare/test_no_prepare.egg-info')}. I think this is tripping up ontests/packages/test-no-prepare/test_no_prepare.egg-info/ and the local backend. But I don't know what updated to cause this to start happening.

Regardless of the solution, though, I think the handling here for a missing name should be better, there wasn't any useful info in the error message to tell me about thedist that was failing. I had to addprint(f"{dist.__dict__=}") to see it. Or maybe the normalize name could return None, and let the failure happen elsewhere.