How to put QgsCheckableComboBox() into standby

Question

I'm trying QgsCheckableComboBox() in my simple python script in QGIS. How to pause code execution while a comboBox-window is open (like a dialog box)? In my example, I want to ensure that the print() function is executed only after the comboBox-window is closed. Then the checkedItems list will not be empty and will contain the selected lines ("Venus", "Earth", "Mars"). How can I achieve this?

from qgis.PyQt import QtGui
from qgis.core import *

planet_list = ["Venus", "Earth", "Mars", "Jupiter", "Pluto"]
items = QgsCheckableComboBox()
items.addItems(planet_list)
items.showNormal()

print('\n\n-----------CheckedItems: ', items.checkedItems())

Answer 1

You can add the combobox to a dialog window. After closing the dialog, print prints the selected items.

from qgis.PyQt import QtGui
from qgis.core import *

planet_list = ["Venus", "Earth", "Mars", "Jupiter", "Pluto"]
items = QgsCheckableComboBox()
items.addItems(planet_list)

dlg = QDialog()
layout = QVBoxLayout()
layout.addWidget(items)
dlg.setLayout(layout)
dlg.exec_()

print('\n\n-----------CheckedItems: ', items.checkedItems())