In general, I load all my ui files via the loadui() method, and this works fine for me. This looks like this: #!/usr/bin/env python #-*- coding:utf-8 -*- ''' The modules for Qt are imported. PyQt are a set of Python bindings for Qt. ''' from PyQt4.QtGui import QDialog from PyQt4.uic import loadUi from PyQt4.QtCore import Qt, QFile from PyQt4 import QtCore class My_Window(QDialog): def __init__(self, parent): QDialog.__init__(self, parent) UI_PATH = QFile(":/ui_file/test.ui") UI_PATH.open(QFile.ReadOnly) self.ui_test = loadUi(UI_PATH, self) UI_PATH.close() Now I try to load the ui file via loaduiType(), but it doesn't work. I tried with this code: from PyQt4.uic import loadUiType UI_PATH = QFile(":/ui_file/test.ui") Ui_Class, _ = loadUiType(UI_PATH) class Test_Window(QDialog, UiClass): def __init__(self, parent): QDialog.__init__(self, parent) self.setupUi(self) What is the correct and best why to load the ui file with the loadUiType() method? Continue reading...