Data will not save when using ComboBoxes inside QTableWidget

Question

import sys
from PyQt6 import QtWidgets
from PyQt6.QtWidgets import QApplication, QItemDelegate, QWidget, QTableWidget, QTableWidgetItem, QPushButton, QHeaderView, QHBoxLayout, QVBoxLayout
from PyQt6.QtCore import Qt
import pandas as pd


class ComboBoxDelegate(QItemDelegate):
    def __init__(self, parent=None):
        super(ComboBoxDelegate, self).__init__(parent)
        self.items = []

    def setItems(self, items):
        self.items = items

    def createEditor(self, widget, option, index):
        editor = QtWidgets.QComboBox(widget)
        editor.addItems(self.items)
        return editor

    def setEditorData(self, editor, index):
        value = index.model().data(index, Qt.ItemDataRole.EditRole)
        if value:
            editor.setCurrentText(str(value))
            print("Data Changed")

    def setModelData(self, editor, model, index):
        model.setData(index, editor.currentIndex(), Qt.ItemDataRole.EditRole)

    def updateEditorGeometry(self, editor, option, index):
        editor.setGeometry(option.rect)

class MyApp(QWidget):
    def __init__(self):
        super().__init__()
        self.window_width, self.window_height = 700, 500
        self.resize(self.window_width, self.window_height)
        self.setWindowTitle('Load Excel (or CSV) data to QTableWidget')

        layout = QVBoxLayout()
        self.setLayout(layout)

        self.table = QTableWidget()
        layout.addWidget(self.table)

        self.button = QPushButton('&Load Data')
        self.button.clicked.connect(lambda _, xl_path=excel_file_path,: self.loadExcelData(xl_path))
        layout.addWidget(self.button)

    def loadExcelData(self, excel_file_dir):
        df = pd.read_csv(excel_file_dir)
        if df.size == 0:
            return

        df.fillna('', inplace=True)
        self.table.setRowCount(df.shape[0])
        self.table.setColumnCount(df.shape[1])
        self.table.setHorizontalHeaderLabels(df.columns)

        # returns pandas array object
        for row in df.iterrows():
            values = row[1]
            for col_index, value in enumerate(values):
                if isinstance(value, (float, int)):
                    value = '{0:0,.0f}'.format(value)
                tableItem = QTableWidgetItem(str(value))
                self.table.setItem(row[0], col_index, tableItem)
        self.create_delegate(self.table)
        self.table.setColumnWidth(2, 300)
    
    def create_delegate(self, table):
        test_del = ComboBoxDelegate()
        test_list = ["Gravity Main", "Manhole", "Lateral"]
        test_del.setItems(test_list)
        table.setItemDelegateForColumn(0, test_del)


if __name__ == '__main__':
    
    excel_file_path = "[Your CSV]"

    app = QApplication(sys.argv)
    app.setStyleSheet('''
        QWidget {
            font-size: 17px;
        }
    ''')
    
    myApp = MyApp()
    myApp.show()

    try:
        sys.exit(app.exec())
    except SystemExit:
        print('Closing Window...')

Extension to previous question
Change the file directory to a random csv.
This populates the QTableWidget and does the same thing as my main program.
The QTableWidget does not save the changes.
My goal is to be able to populate multiple columns with different options based on the csv that is loaded. I had a working version but using QTableView instead of QTableWidget and I am working on transferring that progress.

Answer 1

The issue is caused by a code generation bug , according to the PyQt maintainer.

It should have been fixed in the following PyQt6 snapshots, so it's very likely that if you do a pip update you'll get the working version already, otherwise wait a couple of days and keep an eye on the changelog of the official site .