If you want to get the text from the items in the selected rows, you could try this:
indexes = tablewidget.selectionModel().selectedRows(column)
for index in sorted(indexes):
row = index.row()
rowtext = []
for column in range(tablewidget.columnCount()):
rowtext.append(tablewidget.item(row, column).text())
print(rowtext)
But note that selectedRows only get rows where all items are selected.