Simple PyQt5/QML application

application.js

function log() {
  console.log("HELLO!");
}

basic.qml

//import related modules
import QtQuick 2.3
import QtQuick.Controls 1.2
import QtQuick.Window 2.2
import "application.js" as App

//window containing the application
ApplicationWindow {

    //title of the application
    title: qsTr("Hello World")
    width: 640
    height: 480


    //a button in the middle of the content area
    Button {
        id: btn
        text: qsTr("Hello World")
        anchors.horizontalCenter: parent.horizontalCenter
        anchors.verticalCenter: parent.verticalCenter
        onClicked: App.log()
    }
}

main.py

import sys
import os
from PyQt5.QtWidgets import QApplication
from PyQt5.QtQml import QQmlApplicationEngine

if __name__ == '__main__':
    full_directory = os.path.dirname(os.path.abspath(__file__))
    app = QApplication(sys.argv)
    engine = QQmlApplicationEngine()
    qml_file = os.path.join(full_directory, "basic.qml")
    engine.load(str(qml_file))

    window = engine.rootObjects()[0]
    window.show()
    sys.exit(app.exec_())