def load_table(self):
        with open("price.csv", encoding="utf8") as table:
            reader = csv.reader(table, delimiter=';', quotechar='"')
            title = next(reader) + ["Количество"]
            self.table_widget.setColumnCount(len(title))
            self.table_widget.setHorizontalHeaderLabels(title)
            self.table_widget.setRowCount(0)
            for i, row in enumerate(reader):
                self.table_widget.setRowCount(self.table_widget.rowCount() + 1)
                for j, elem in enumerate(row):
                    self.table_widget.setItem(i, j, QTableWidgetItem(elem))

                count_item = QTableWidgetItem(str(100 * i))
                self.table_widget.setItem(i, j + 1, count_item)
        self.table_widget.resizeColumnsToContents()
        self.table_widget.selectionModel().selectionChanged.connect(self.count_changed)

    def count_changed(self, selected, deselected):
        if not deselected:
            return

        a = deselected.indexes()[0]
        cell_count = self.table_widget.item(a.row(), a.column())

        if a.column() != self.table_widget.columnCount() - 1:
            return

        cell_price = self.table_widget.item(a.row(), a.column() - 1)