pyqt警告窗口

def infortbox(self):
        text=self.UrlFile.text()
        self.box=QtGui.QMessageBox(self)
        self.box.setText(u'当前网页中非法{0},状态返回为{1},请检查后'.format(text,u'找不到'))
        self.box.setWindowTitle(u'错误提示')
        yes=self.box.addButton('Yes',QtGui.QMessageBox.ActionRole)
        no=self.box.addButton('No',QtGui.QMessageBox.ActionRole)
        self.box.exec_()
        button=self.box.clickedButton()
        if button==yes:
            self.box.move(0,0)
            for i in range(500000):
                self.box.move(0,100)
            for i in range(500000):
                self.box.move(100,0)
            for i in range(500000):
                self.box.move(0,0)
            self.UrlFile.clear()
            if self.move01==0:
                self.move01=1
            elif self.move01==1:
                self.move01=0
        elif button==no:
            pass

QtCore.QTextCodec.setCodecForTr(QtCore.QTextCodec.codecForName("utf8"))

QtCore.QTextCodec.setCodecForTr(QtCore.QTextCodec.codecForName("system"))

QtCore.QTextCodec.setCodecForCStrings(QtCore.QTextCodec.codecForName("system"))

QtCore.QTextCodec.setCodecForLocale(QtCore.QTextCodec.codecForName("system"))