Почему не открывается база данных? (QTableView)

import sqlite3
from PyQt5 import QtWidgets, uic
import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QDialog, QFileDialog, QMessageBox
from PyQt5.QtSql import QSqlDatabase, QSqlQuery, QSqlTableModel, QSqlQueryModel
import newproject


db = sqlite3.connect('database.db')
cursor = db.cursor()

cursor.execute('''CREATE TABLE IF NOT EXISTS users(
login TEXT,
password TEXT
)''')
db.commit()

for i in cursor.execute('SELECT * FROM users'):
print(i)

db1 = sqlite3.connect('databasepassw.db')
sq = db1.cursor()

cursor.execute('''CREATE TABLE IF NOT EXISTS pass(
    platform TEXT,
    login TEXT,
    password TEXT
)''')
db1.commit()



class Registration(QtWidgets.QMainWindow, newproject.Ui_MainWindow):
def __init__(self):
    super(Registration, self).__init__()
    self.setupUi(self)
    self.label.setText('')
    self.label_2.setText('Регистрация')
    self.lineEdit.setPlaceholderText('Придумайте логин')
    self.lineEdit_2.setPlaceholderText('Придумайте пароль')
    self.pushButton.setText('Регистрация')
    self.pushButton_2.setText('Вход')
    self.setWindowTitle('Войти в систему')

    self.pushButton.pressed.connect(self.reg)
    self.pushButton_2.pressed.connect(self.login)

def login(self):
    self.login = Login()
    self.login.show()
    self.hide()

def reg(self):
    user_login = self.lineEdit.text()
    user_password = self.lineEdit_2.text()

    if len(user_login) == 0:
        return

    if len(user_password) == 0:
        return

    cursor.execute(f'SELECT login FROM users WHERE login="{user_login}"')
    if cursor.fetchone() is None:
        cursor.execute(f'INSERT INTO users VALUES ("{user_login}", "{user_password}")')
        self.label.setText(f'Аккаунт {user_login} успешно зарегистрирован!')
        db.commit()
        self.hide()
        self.Menu = MenuWindow()
        self.Menu.show()

    else:
        self.label.setText('Такая записать уже имеется!')


class Login(QtWidgets.QMainWindow, newproject.Ui_MainWindow):
def __init__(self):
    super(Login, self).__init__()
    self.setupUi(self)
    self.label.setText('')
    self.label_2.setText('Вход')
    self.lineEdit.setPlaceholderText('Введите логин')
    self.lineEdit_2.setPlaceholderText('Введите пароль')
    self.pushButton.setText('Вход')
    self.pushButton_2.setText('Регистрация')
    self.setWindowTitle('Войти в систему')

    self.pushButton.pressed.connect(self.login)
    self.pushButton_2.pressed.connect(self.reg)

def reg(self):
    self.reg = Registration()
    self.reg.show()
    self.hide()

def login(self):
    user_login = self.lineEdit.text()
    user_password = self.lineEdit_2.text()

    if len(user_login) == 0:
        return

    if len(user_password) == 0:
        return

    cursor.execute(f'SELECT password FROM users WHERE login="{user_login}"')
    check_pass = cursor.fetchall()

    cursor.execute(f'SELECT login FROM users WHERE login="{user_login}"')
    check_login = cursor.fetchall()

    if check_pass[0][0] == user_password and check_login[0][0] == user_login:
        self.label.setText('Успешная авторизация!')
        self.Menu = MenuWindow()
        self.Menu.show()
        self.hide()
    else:
        self.label.setText('Ошибка авторизации!')


class MenuWindow(QMainWindow):
def __init__(self):
    super(MenuWindow, self).__init__()
    uic.loadUi('NEW_chosing.ui', self)
    self.pushButton_nazad.clicked.connect(self.login)
    self.pushButton1.setText("Добавить\n пароль")
    self.pushButton1.clicked.connect(self.add_pass)
    self.pushButton2.clicked.connect(self.show_pass)
    self.setWindowTitle('Выберите действие')


def login(self):
    self.login = Login()
    self.login.show()
    self.hide()

def add_pass(self):
    uic.loadUi('choose1.ui', self)
    self.pushButton_nazad.clicked.connect(self.menu)
    self.setWindowTitle('Добавить пароль')
    self.pushButton_dobavit.clicked.connect(self.adding_pass)

def adding_pass(self):
    platform = self.lineEdit_platform.text()
    login = self.lineEdit_login.text()
    password = self.lineEdit_password.text()

    if len(platform) == 0:
            return

    if len(login) == 0:
            return

    if len(password) == 0:
            return

    cursor.execute(f'SELECT platform FROM pass WHERE platform="{platform}"')
    if cursor.fetchone() is None:
        cursor.execute(f'INSERT INTO pass VALUES ("{platform}", "{login}", "{password}")')
        self.title_2.setText(f'Аккаунт {platform} успешно зарегистрирован!')
        db1.commit()


def show_pass(self):
    uic.loadUi('chekingnew1.ui', self)
    self.pushButton_nazad.clicked.connect(self.menu)
    self.setWindowTitle('Сохраненные пароли')

    db = QSqlDatabase.addDatabase('QSQLITE')
    db.setDatabaseName('databasepass.db')
    db.open()
    self.model = QSqlTableModel(self)
    self.model.setTable("pass")
    self.model.select()
    self.tableWidget.setModel(self.model)

def menu(self):
    self.menu = MenuWindow()
    self.menu.show()
    self.hide()



if __name__ == '__main__':
app = QApplication(sys.argv)
log = Login()
log.show()
sys.exit(app.exec_())