A simple and secure password hash checker. Check if your chosen password is popular and has been exposed in security vulnerabilities without publishing the password itself. By using partial hashes the password doesn't leave your local pc at any time...

check_passwort.py

import hashlib, requests, getpass
from threading import Event


passwort = getpass.getpass("Password: ")

sha_1 = hashlib.sha1(passwort.encode())

pwHash = sha_1.hexdigest().upper()
print ("\nPassword hash:\t" + pwHash)

apiRequest = "https://api.pwnedpasswords.com/range/" + pwHash[:5]

print("API request:\t" + repr(apiRequest) + "\n")
r = requests.get(apiRequest)

if r.status_code != 200: raise Exception("API Request failed!")

for line in r.text.splitlines():
    if line.startswith(pwHash[5:]):
        print("Password {:s} was leaked {:,} times. Don't use it!".format(repr(passwort), int(line.split(":")[1])))
        break
else:
    print("The entered password isn't leaked, but this does not mean that it has to be 100% safe.")

Event().wait()