blank_qt.py

import sys
from PyQt5.QtWidgets import *
from PyQt5.uic import loadUiType
import subprocess

ui, _ = loadUiType('converter.ui')

class MainApp(QMainWindow, ui):
    def __init__(self):
        QMainWindow.__init__(self)
        self.setupUi(self)
        self.Handle_UI_Changes()
        self.Handle_Buttons()

    def Handle_UI_Changes(self):
        pass

    def Handle_Buttons(self):
        pass

def main():
    app = QApplication(sys.argv)
    window = MainApp()
    window.show()
    app.exec_()

if __name__ == '__main__':
    main()