get checked text from checkable combobox in Pyqt5

i'm trying to collect text of checked items from custom combobox created with checkbox in pyqt5.

Here's my workable snippet which is not printing selected texts as per my expectation:

from PyQt5 import QtCore, QtGui, QtWidgets
import sys

class CheckableComboBox(QtWidgets.QComboBox):
    def __init__(self, parent = None):
        super(CheckableComboBox, self).__init__(parent)
        self.view().pressed.connect(self.handleItemPressed)
        self.setModel(QtGui.QStandardItemModel(self))

    def handleItemPressed(self, index):
        item = self.model().itemFromIndex(index)
        if item.checkState() == QtCore.Qt.Checked:
            item.setCheckState(QtCore.Qt.Unchecked)
        else:
            item.setCheckState(QtCore.Qt.Checked)

    def checkedItems(self):
        checkedItems = []
        for index in range(self.count()):
            item = self.item(index)
            if item.checkState() == Qt.Checked:
                checkedItems.append(item)
        return checkedItems

class Ui_dialogCreateBatch(object):
    def setupUi(self, dialogCreateBatch):
        dialogCreateBatch.resize(400, 338)
        dialogCreateBatch.setMouseTracking(True)

        self.gridLayoutWidget = QtWidgets.QWidget(dialogCreateBatch)
        self.gridLayoutWidget.setGeometry(QtCore.QRect(10, 10, 360, 115))
        self.gridLayoutWidget.setObjectName("gridLayoutWidget")
        self.gridLayout = QtWidgets.QGridLayout(self.gridLayoutWidget)
        self.gridLayout.setContentsMargins(0, 0, 0, 0)
        self.gridLayout.setObjectName("gridLayout")

        self.cboItemList = CheckableComboBox(self.gridLayoutWidget)
        self.cboItemList.setObjectName("cboItemList")
        self.gridLayout.addWidget(self.cboItemList, 0, 0, 1, 1)

        data = ('item1', 'item2', 'item3')
        for index, element in enumerate(data):
            self.cboItemList.addItem(element)
            item = self.cboItemList.model().item(index, 0)
            item.setCheckState(QtCore.Qt.Unchecked)

        self.buttonBox = QtWidgets.QDialogButtonBox(dialogCreateBatch)
        self.buttonBox.setGeometry(QtCore.QRect(100, 300, 156, 23))
        self.buttonBox.setOrientation(QtCore.Qt.Horizontal)

        self.buttonBox.setStandardButtons(QtWidgets.QDialogButtonBox.Cancel|QtWidgets.QDialogButtonBox.Ok)
        self.buttonBox.setObjectName("buttonBox")

        self.retranslateUi(dialogCreateBatch)

        self.buttonBox.accepted.connect(self.accept)
        self.buttonBox.rejected.connect(dialogCreateBatch.reject)
        QtCore.QMetaObject.connectSlotsByName(dialogCreateBatch)

    def retranslateUi(self, dialogCreateBatch):
        _translate = QtCore.QCoreApplication.translate
        dialogCreateBatch.setWindowTitle(_translate("dialogCreateBatch", "Create Item Batch"))

    def accept(self):
        selectedItems = self.cboMulSup.checkedItems()
        print(selectedItems)
        dialogCreateBatch.close

if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    dialogCreateBatch = QtWidgets.QDialog()
    ui = Ui_dialogCreateBatch()
    ui.setupUi(dialogCreateBatch)
    dialogCreateBatch.show()
    sys.exit(app.exec_())

In the above code i have added print line for logging returned data. but i;m not receiving any data returned from here

thanks in advance