PyQt Starter

__init__.py

import sys
from PyQt5 import QtCore, QtGui, QtWidgets
from design import Ui_MainWindow

class App(Ui_MainWindow):
	def __init__(self, MainWindow):
		Ui_MainWindow.__init__(self)
		self.setupUi(MainWindow)

		# Connect a widget
		self.pushButton.clicked.connect(self.func)

	def func():
		print ("Test")

if __name__ == '__main__':
	app = QtWidgets.QApplication(sys.argv)
	mw = QtWidgets.QMainWindow()

	prog = App(mw)

	mw.show()
	sys.exit(app.exec_())