Re: Question regarding setuptools automatic discovery (pyproject.toml)

Hi,

I ran into a build failure for a Python package that dropped setup.py in the latest update and uses pyproject.toml for metadata and setuptools. The build failed due to 'error: Installed (but unpackaged) file(s) found' [1]. However, all the erroneously installed modules should be excluded by default, if I understand the setuptools automatic discovery documentation [2] correctly. They are listed in 'FlatLayoutPackageFinder.DEFAULT_EXCLUDE'. In this case 'docs', 'scripts' and 'test'. Since this is still beta when using pyproject.toml, I was wondering if someone else has come across this misbehavior. Or, maybe, it's something I failed to spot in pyproject.toml, that's causing it. I can make it work by adding a 'include = ["palettable"]' in the tool.setuptools.packages.find table [3]. But I'd like a second opinion before submitting a PR upstream.