qtableview
insertColumns (QAbstractTableModel) does not work correctly)
Encountered a problem: when trying to add a column after adding it N-rows(in my example 2), it turns out that:
Fig.1. Added ... on2.clicked.connect(lambda: model.insertRows(0, 2))
button2.show()
button2.move(100, 200)
sys.exit(app.exec_())