[Python] Why pyqt tablewigdet is only displaying row number and no data?

I wonder if the problem is from pony.orm or from my python code?

@db_session
def load_data(self):
result = db.execute("""SELECT * FROM Product""")
self.ui.tableWidget.setRowCount(0)
for row_number, row_data in enumerate(result):
self.ui.tableWidget.insertRow(row_number)
for column_number, data in enumerate(row_data):
self.ui.tableWidget.setItem(row_number, column_number, QTableWidgetItem(str(data)))

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