Как реализовать графический редактор на python с помощью pyqt5?

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import sys
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QPainter, QPen, QColor
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget


class PaintWidget(QWidget):

    def __init__(self, parent=None):
        super().__init__(parent)
        self.pen = QPen(QColor(0, 0, 0), 2)
        self.last_x, self.last_y = None, None
        self.image = QImage(400, 300, QImage.Format_RGB32)
        self.image.fill(Qt.white)

    def paintEvent(self, event):
        painter = QPainter(self)
        painter.drawImage(self.rect(), self.image, self.image.rect())

    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.last_x, self.last_y = event.x(), event.y()

    def mouseMoveEvent(self, event):
        if event.buttons() & Qt.LeftButton:
            painter = QPainter(self.image)
            painter.setPen(self.pen)
            painter.drawLine(self.last_x, self.last_y, event.x(), event.y())
            self.last_x, self.last_y = event.x(), event.y()
            self.update()

    def save_image(self, filename):
        self.image.save(filename)


class MainWindow(QMainWindow):

    def __init__(self):
        super().__init__()
        self.setWindowTitle('Paint')
        self.paint_widget = PaintWidget(self)
        self.setCentralWidget(self.paint_widget)
        self.resize(400, 300)

        save_action = self.menuBar().addAction('Save')
        save_action.triggered.connect(self.save)

    def save(self):
        filename, _ = QFileDialog.getSaveFileName(self, 'Save', '.', 'Images (*.png *.xpm *.jpg)')
        if filename:
            self.paint_widget.save_image(filename)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    main_window = MainWindow()
    main_window.show()
    sys.exit(app.exec_())