Read-Only QAbstractTableModel Subclass

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import sys
import csv

from PySide6.QtCore import QAbstractTableModel, QModelIndex, Qt
from PySide6.QtWidgets import (QApplication,
    QWidget, QTableView, QVBoxLayout)
from PySide6.QtTest import QAbstractItemModelTester


class CsvModel(QAbstractTableModel):
    
    def __init__(self, source, parent=None):
        
        super().__init__(parent)
        
        self.csv_data = []
        with open(source) as csv_file:
            reader = csv.reader(csv_file)
            self.header = next(reader)
            for row in reader:
                self.csv_data.append(row)
                
    def rowCount(self, parent=QModelIndex()):
        return len(self.csv_data)
    
    def columnCount(self, parent=QModelIndex()):
        return 4
    
    def data(self, index, role):
        if role == Qt.ItemDataRole.DisplayRole:
            return self.csv_data[index.row()][index.column()]
        
    # QTableView can have a header

    def headerData(self, section, orientation, role):
        if orientation == Qt.Orientation.Horizontal:
            if role == Qt.ItemDataRole.DisplayRole:
                return self.header[section]

class Window(QWidget):
    
    def __init__(self):

        super().__init__()

        layout = QVBoxLayout()
        self.setLayout(layout)

        model = CsvModel('data.csv')
        print(model.columnCount(), model.rowCount())
        QAbstractItemModelTester(model)
        view = QTableView()
        view.setModel(model)
        view.resizeColumnsToContents()
        layout.addWidget(view)


if __name__ == '__main__':

    app = QApplication(sys.argv)

    main_window = Window()
    main_window.show()

    sys.exit(app.exec())