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Cube rotation with pyopengl and pyqt

hi all :)
I'm very new to python. I have a problem with my code, it's a very simple rotating cube. I don't have any problem with this cube code with pygame screen but when I use it with pyqt (or Qt designer widgets), it runs but it shows nothing!!!

I'll be if glad someone could help me with it.tnx in advance

from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL import *
from PyQt5.QtOpenGL import *
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import *
import sys,time
class MainWindow(QGLWidget):
    def __init__(self):
        super(MainWindow, self).__init__()

        self.widget = glWidget(self)
        mainLayout = QVBoxLayout()
        mainLayout.addWidget(self.widget)
        self.setLayout(mainLayout)

class glWidget(QGLWidget):

    def __init__(self, parent):
        QGLWidget.__init__(self, parent)

        #self.setMinimumSize(400, 400)

        self.verticies = (
            (1,-1,-1),
            (1,1,-1),
            (-1,1,-1),
            (-1,-1,-1),
            (1,-1,1),
            (1,1,1),
            (-1,-1,1),
            (-1,1,1))
        self.edges = (
            (0,1),
            (0,3),
            (0,4),
            (2,1),
            (2,3),
            (2,7),
            (6,3),
            (6,4),
            (6,7),
            (5,1),
            (5,4),
            (5,7))

    def paintGL(self):
        while True:
            #glRotatef(1,3,1,1)
            glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
            glBegin(GL_LINE)
            for self.edge in self.edges:
                for self.vertex in self.edge:
                    glVertex3fv(self.verticies[self.vertex])
            glEnd()
            glFlush()
            time.sleep(1)       

    def resizeGL(self, w, h):
        glMatrixMode(GL_PROJECTION)
        glLoadIdentity()
        glOrtho(-50, 50, -50, 50, -50.0, 50.0)
        glViewport(0, 0, w, h)

    def initializeGL(self):

        #glClearColor(0.0, 0.0, 0.0, 1.0)
        gluPerspective(45,800/600,0.1,50.0)
        glTranslatef(0.0,0.0,-5)
        glRotatef(0,0,0,0)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    app.exec_()