pyqt - populating QTableWidget with csv data

Question

I have a QTableWidget, i export the data from this table to a csv file. But now, i want to Open a existing csv file and populate my table with this data. how can i do it?

Answer 1

import csv
 
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QKeySequence, QCursor
from PyQt5.QtWidgets import QAction, QApplication, QFileDialog, QMenu, QTableView
 
 
class SEToolsTableView(QTableView):
 
    """QTableView class extended for SETools use."""
 
    def __init__(self, parent):
        super(SEToolsTableView, self).__init__(parent)
 
        # set up right-click context menu
        self.save_csv_action = QAction("Save table to CSV...", self)
        self.menu = QMenu(self)
        self.menu.addAction(self.save_csv_action)
 
        # connect signals
        self.save_csv_action.triggered.connect(self.choose_csv_save_location)
 
    def contextMenuEvent(self, event):
        self.menu.popup(QCursor.pos())
 
    def event(self, e):
        if e == QKeySequence.Copy or e == QKeySequence.Cut:
            datamodel = self.model()
 
            selected_text = []
            current_row = None
            current_col = None
            prev_row = None
            prev_col = None
            for index in sorted(self.selectionModel().selectedIndexes()):
                current_row = index.row()
                current_col = index.column()
 
                if prev_row is not None and current_row != prev_row:
                    selected_text.append('\n')
                elif prev_col is not None and current_col != prev_col:
                    selected_text.append('\t')
 
                selected_text.append(datamodel.data(index, Qt.DisplayRole))
 
                prev_row = current_row
                prev_col = current_col
 
            QApplication.clipboard().setText("".join(selected_text))
            return True
 
        else:
            return super(SEToolsTableView, self).event(e)
 
    def choose_csv_save_location(self):
        filename = QFileDialog.getSaveFileName(self, "Save to CSV", "table.csv",
                                               "Comma Separated Values Spreadsheet (*.csv);;"
                                               "All Files (*)")[0]
 
        if filename:
            self.save_csv(filename)
 
    def save_csv(self, filename):
        """Save the current table data to the specified CSV file."""
 
        datamodel = self.model()
        row_count = datamodel.rowCount()
        col_count = datamodel.columnCount()
 
        with open(filename, 'w') as fd:
            writer = csv.writer(fd, quoting=csv.QUOTE_MINIMAL)
 
            # write headers
            csv_row = []
            for col in range(col_count):
                csv_row.append(datamodel.headerData(col, Qt.Horizontal, Qt.DisplayRole))
 
            writer.writerow(csv_row)
 
            # write data
            for row in range(row_count):
                csv_row = []
 
                for col in range(col_count):
                    index = datamodel.index(row, col)
                    csv_row.append(datamodel.data(index, Qt.DisplayRole))
 
                writer.writerow(csv_row)