PyQt5: drawing multiple rectangles using mouseEvents by implementing QGraphicsScene, QGraphicsView and QGraphicsItem

Question

I am creating a desktop application using PyQt5 where the user will be able to draw rectangles on QGraphicsScene.

User should be able to select the top-left corner of the rectangle with first mouse click and the bottom-right corner with second mouse click. A rectangle should appear in that location with the perimeter well defined. I created application but have a problem I am not able to draw rectangles on scene.

Please find the below code for reference

import sys
from PyQt5.QtWidgets import *
from PyQt5 import QtGui, QtCore
from PyQt5.QtGui import QPainter, QPen, QBrush
from PyQt5.QtCore import Qt

class Windo(QWidget):
    def __init__(self):
        super().__init__()

        self.setGeometry(0,0,500,500)
        self.setWindowTitle("pu")
        self.setWindowIcon(QtGui.QIcon('x.jpeg'))

        self.begin = QtCore.QPoint()
        self.end = QtCore.QPoint()
        self.scene = QGraphicsScene()
        view = QGraphicsView(self.scene, self)
        view.setGeometry(0,0,400,400)

        self.show()

    def paintEvent(self,event):
        qp = QPainter(self)
        qp.begin(self)
        qp.setPen(QPen(Qt.black, 6, Qt.SolidLine))
        qp.drawRect(QtCore.QRect(self.begin, self.end))
        qp.end()

    def mousePressEvent(self, event):
        self.begin = event.pos()
        self.end = event.pos()

    def mouseMoveEvent(self, event):
        self.end = event.pos()
        self.update()

    def mouseReleaseEvent(self, event):
        self.begin = event.pos()
        self.end = event.pos()

app = QApplication(sys.argv)
win = Windo()
sys.exit(app.exec_())