Check if a password has been compromised.

check.py

import hashlib
import getpass
from urllib.request import urlopen, Request


def check(password):
    digest = hashlib.sha1(password.encode('utf-8')).hexdigest().upper()

    head, tail = digest[:5], digest[5:]

    request = Request(
        f'https://api.pwnedpasswords.com/range/{head}',
        headers={'User-Agent': 'check.py'}
    )

    with urlopen(request) as response:
        for line in (line.decode('utf-8').strip() for line in response):
            if line.startswith(tail):
                _, count = line.split(':', 1)
                return int(count)

    return 0


def main():
    count = check(getpass.getpass())
    if count:
        print(f'Seen {count} times')


if __name__ == '__main__':
    main()