check_distrowatch_py_support.py

from lxml import html
import requests


template = "https://distrowatch.com/search.php?pkg=Python&relation=greaterequal&pkgver={}&distrorange=InLatest#pkgsearch"


def get_distros(min_python_version):
    response = requests.get(template.format(min_python_version))
    distros = set()
    for el in html.fromstring(response.text).findall(".//b/a"):
        if el.tail:
            pos = int(el.tail.strip(" ()"))
            if pos <= 100:
                distros.add(f"{pos:3} {el.text}")
    return distros


distro37 = get_distros("3.7")
distro38 = get_distros("3.8")

print("\n".join(sorted(distro37 - distro38)))