Accessing text field and processing in python

[aayushlakkad]

Hello, I am trying to create a simple qt gui for login page. where I have 2 text fields and a button. I want to get the value of the text fields in python and then use those for logging in using API through python.
I was able to get the value of textfields in python using following code:
QML:

import QtQuick 2.15
import QtQuick.Controls 2.15
import '../imports/Test'

Item {
    id: login_item
    width: 800
    height: 600

    Rectangle {
        id: rectangle
        color: "#c2dcf7"
        anchors.fill: parent

        TextField {
            id: username
            objectName: "username"
            width: 220
            height: 40
            placeholderText: qsTr("Username")
            visible: true
            anchors.top: domain.bottom
            leftPadding: 10
            topPadding: 8
            font.pointSize: 12
            anchors.topMargin: 25
            anchors.horizontalCenter: parent.horizontalCenter
        }

        TextField {
            id: password
            objectName: "password"
            width: 220
            height: 40
            echoMode: TextInput.Password
            placeholderText: qsTr("Password")
            visible: true
            topPadding: 8
            leftPadding: 10
            anchors.top: username.bottom
            font.pointSize: 12
            anchors.topMargin: 25
            anchors.horizontalCenter: parent.horizontalCenter
        }

        Custom_btn {
            id: login_btn
            objectName: "login_btn"
            text: "Login"
            anchors.top: password.bottom
            anchors.topMargin: 50
            anchors.horizontalCenter: parent.horizontalCenter
            onClicked: {
                var dom_name = domain.text
                var usrname = username.text
                var pwd = password.text
                // console.log(domain_name);
                credentials.get_domain_name(domain)
                credentials.get_user_name(usrname)
                credentials.get_password(pwd)
            }
        }

        Connections {
            target: credentials
        }
    }
}

login_test.py:

from PySide6.QtCore import QObject, Slot, Signal, Property
from PySide6.QtWidgets import QLineEdit

class get_credentials(QObject):

    def __init__(self):
        QObject.__init__(self)
        self.domain_name = ""
        self.user_name = ""
        self.password = ""

    btn_signal = Signal(str)

    @Slot(str, result=str)
    def get_user_name(self, user):
        if self.user_name == user:
          return
        self.user_name = user
        # return self.user_name

    @Slot(str, result=str)
    def get_password(self, pwd):
        if self.password == pwd:
          return
        self.password = pwd
        # return self.password

main.py:

# This Python file uses the following encoding: utf-8
# This Python file uses the following encoding: utf-8
import os
from pathlib import Path
import sys
from api_login_test import get_credentials
# from login_data import get_credentials

from PySide6.QtCore import QCoreApplication, Qt, QUrl, QObject
from PySide6.QtWidgets import QApplication, QLineEdit
from PySide6.QtQml import QQmlApplicationEngine

CURRENT_DIRECTORY = Path(__file__).resolve().parent


def main():
    app = QApplication(sys.argv)
    engine = QQmlApplicationEngine()

    credentials = get_credentials()

    engine.rootContext().setContextProperty('credentials', credentials)
    filename = os.fspath(CURRENT_DIRECTORY / "qml" / "main.qml")
    url = QUrl.fromLocalFile(filename)

    def handle_object_created(obj, obj_url):
        if obj is None and url == obj_url:
            QCoreApplication.exit(-1)

    engine.objectCreated.connect(handle_object_created, Qt.QueuedConnection)
    engine.load(url)
    tf = engine.rootObjects()[0]
    btn = tf.findChild(QObject,"login_btn")
    usr = tf.findChild(QObject, "domain")
    print(usr.property('text'))
    domnm = credentials.get_user_name(usr)
    print('user= {}'.format(domnm))

    sys.exit(app.exec())


if __name__ == "__main__":
    main()

I am able to get values of username and password from qml file in get_user_name() method. now I want to call this method outside get_credentials class for other tasks. so how can I do that, as it takes argument from