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.
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.