python - how to Get total number of checked QlistWidgetItem in a list using Pyqt5 in python

Question

I have a function that add Items to QlistWidget.

I want to add a check box to the added items, after the user check the check box i need to print the total number of checked items.

Nothing is printed after the checkebox are checked.

code:

def ListFilesInViewer(self,Files):              
        for item1 in Files:
            item = QtWidgets.QListWidgetItem(item1)
            item.setCheckState(QtCore.Qt.Unchecked)

            for index in range(self.listWidgetPDFlist.count()):
                if self.listWidgetPDFlist.item(index).checkState() == QtCore.Qt.Checked:
                     print("checked item ==>{}".format(self.listWidgetPDFlist.item(index)))


            self.listWidgetPDFlist.addItem(item)
            self.lineEditTotalPDFnumber.setText(str(self.listWidgetPDFlist.count())) 

Answer 1

I tried to recreate what you want to do. Try it:

import sys
from PyQt5 import QtWidgets, QtGui, QtCore

class Window(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(Window, self).__init__(parent)

        self.lineEditTotalPDFnumber = QtWidgets.QLineEdit('QLineEdit')
        self.lineEditTotalPDFnumber.setReadOnly(True)

        self.listWidgetPDFlist = QtWidgets.QListWidget()

        self.vlayout = QtWidgets.QVBoxLayout()
        self.vlayout.addWidget(self.listWidgetPDFlist)
        self.vlayout.addWidget(self.lineEditTotalPDFnumber)

        self.btnAddItems = QtWidgets.QPushButton()
        self.btnAddItems.setText('add items')
        self.vlayout.addWidget(self.btnAddItems)
        self.btnAddItems.clicked.connect(self.addItems)

        self.btnPrintItems = QtWidgets.QPushButton()
        self.btnPrintItems.setText('print the total number of checked items')
        self.vlayout.addWidget(self.btnPrintItems)
        self.btnPrintItems.clicked.connect(self.printItems)

        self.setLayout(self.vlayout)

    def addItems(self):
        Files = ["file1", "file2", "file3",]
        print("\nFiles ", Files)

        self.ListFilesInViewer(Files)

    def ListFilesInViewer(self, Files):              
        for item1 in Files:
            item = QtWidgets.QListWidgetItem(item1)
            print("\titem =",item)
            item.setCheckState(QtCore.Qt.Unchecked)  #Unchecked
            item.setText('`{}` - QListWidget item № `{}`'.format(str(item1), str(self.listWidgetPDFlist.count()))) 
            self.listWidgetPDFlist.addItem(item)  # listWidgetPDFlist

    def printItems(self):
        checkedItem = 0
        for index in range(self.listWidgetPDFlist.count()):
            if self.listWidgetPDFlist.item(index).checkState() == QtCore.Qt.Checked:
                 print("checked item ==>{}, index={}".format(self.listWidgetPDFlist.item(index), index))
                 checkedItem += 1        
        self.lineEditTotalPDFnumber.setText("checked items --> {}".format(str(checkedItem)))


if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    window = Window()
    window.resize(500, 400)
    window.show()
    sys.exit(app.exec_())