相关疑难解决方法(0)

我有一个从Qt Designer派生的简单窗口（design.py），该窗口包含三个单选按钮：

# -*- coding: utf-8 -*-

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.setEnabled(True)
        MainWindow.resize(158, 110)
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
        self.myradioButton1 = QtGui.QRadioButton(self.centralwidget)
        self.myradioButton1.setGeometry(QtCore.QRect(20, 10, 102, 22))
        self.myradioButton1.setObjectName(_fromUtf8("myradioButton1"))
        self.myradioButton2 = QtGui.QRadioButton(self.centralwidget)
        self.myradioButton2.setGeometry(QtCore.QRect(20, 40, 102, 22))
        self.myradioButton2.setObjectName(_fromUtf8("myradioButton2"))
        self.myradioButton3 = QtGui.QRadioButton(self.centralwidget)
        self.myradioButton3.setGeometry(QtCore.QRect(20, …