Second Level Domain Extractor

sldextract.py

#!/usr/bin/env python3
import sys
import urllib.parse

import tldextract
# pip3 install --user tldextract


def main() -> None:
    for line in sys.stdin:
        url = urllib.parse.urlparse(line)
        fqdn = url.netloc if url.scheme and url.netloc else line
        result = tldextract.extract(fqdn)
        print(f'{result.domain}.{result.suffix}')


if __name__ == '__main__':
    main()