Python에서 Qt Designer UI를 재설계할 때 사용자 정의 코드를 보존하는 방법은 무엇입니까?

# Ui_Design.py (Generated from Qt Designer)
from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        [...]

    def retranslateUi(self, MainWindow):
        [...]

# logic.py
from PyQt5 import QtCore, QtGui, QtWidgets
from Ui_Design import Ui_MainWindow

class Logic(QMainWindow, Ui_MainWindow):
    def __init__(self, *args, **kwargs):
        QMainWindow.__init__(self, *args, **kwargs)
        self.setupUi(self)

class Logic(PyQtClass, DesignClass):
    def __init__(self, *args, **kwargs):
        PyQtClass.__init__(self, *args, **kwargs)
        self.setupUi(self)