from PyQt5.QtWidgets import QMainWindow, QApplication, QPushButton, QTextEdit from PyQt5 import uic, QtCore, QtGui, QtWidgets import sys class TestStandMainWindow(QMainWindow): def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) uic.loadUi('climate-lab-main.ui', self) app = QApplication(sys.argv) mainWindow = TestStandMainWindow() mainWindow.show() app.exec_()