[duckerude]

That website is interesting, but maybe not as significant as it initially appears.

In some sense chardet doesn't explicitly support Python 3.7, but it's packaged for it in Debian Stable. I wouldn't expect any problems.

more-itertools is listed in white simply because it doesn't use any granular version classifiers on PyPi. It only has a python_requires setting, which is authoritative.

It's plausible that every single package on that page supports Python 3.7 in practice.