Python3 GUI with PyQt5

from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
import gui
import sys
class Example(QMainWindow, gui.Ui_MainWindow):
    def __init__(self):
        super().__init__()
        self.setupUi(self)
if __name__ == '__main__':
    app = QApplication(sys.argv)
    form = Example()
    form.show()
    app.exec()