PyQt4到PyQt5如何?

我需要手动更改什么才能使代码与PyQt5一起工作?

以下是我代码的第一部分:

import sys
from pymaxwell import *
from numpy import *
from PyQt4 import QtGui, QtCore, uic
from PyQt4.QtGui import QMainWindow, QApplication
from PyQt4.QtCore import *
from PyQt4.phonon import Phonon
from ffmpy import FFmpeg
import os
import app_window_dark
import about

uifile = 'Ui/app_window_dark.ui'
aboutfile = 'Ui/about.ui'

Ui_MainWindow, QtBaseClass = uic.loadUiType(uifile)
Ui_Dialog= uic.loadUiType(uifile)

class About(QtGui.QMainWindow, about.Ui_Dialog):
    def __init__(self, parent=None):
        super(About, self).__init__()
        QtGui.QMainWindow.__init__(self, parent)
        Ui_Dialog.__init__(self)
        self.setWindowModality(QtCore.Qt.ApplicationModal)
        point = parent.rect().bottomRight()
        global_point = parent.mapToGlobal(point)
        self.move(global_point - QPoint(395, 265))
        self.setupUi(self)

class MyApp(QtGui.QMainWindow, app_window_dark.Ui_MainWindow):
    def __init__(self):
        super(MyApp, self).__init__()
        QtGui.QMainWindow.__init__(self)
        self.ui = Ui_MainWindow.__init__(self)
        self.setupUi(self)
        self.about_btn.clicked.connect(self.popup)

        #prev next
        self.btn_next.clicked.connect(self.renderSet)
        self.btn_prev.clicked.connect(self.renderSet)

还有这个代码:

if __name__ == "__main__":
    app = QApplication(sys.argv)
    #style = QApplication.setStyle('plastique')
    window = MyApp()
    window.setFixedSize(750, 320)
    window.show()
    sys.exit(app.exec_())