QGraphicsView's problem

[Acton Martin]

when I want to make a GUI , a pushbutton to chose file ,and a QGraphicsView shows the image I chosen. But there are problems. The image doesn's show here. I can sure I lost some detail things.
logic code first:

import sys
import os
from PyQt5.QtWidgets import QApplication, QMainWindow, QFileDialog, QMessageBox, QGraphicsView, QGraphicsScene, QGraphicsPixmapItem
from PyQt5.QtGui import QPixmap, QImage
from photo_view import Ui_Photo_view
from PIL import Image
import cv2


class show_photo(QMainWindow):
	def __init__(self):
		super(show_photo,self).__init__()
		self.ui =Ui_Photo_view()
		self.ui.setupUi(self)
		self.view = QGraphicsView()

	def select_button_clicked(self):
		file_name = QFileDialog.getOpenFileName(self, "Open File", "./", "jpg (*.jpg)")
		image_path = file_name[0]
		if (file_name[0] == ""):
			QMessageBox.information(self, "提示", self.tr("没有选择图片文件！"))
		print(image_path)
		img = cv2.imread(image_path)  
		img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)  
		x = img.shape[1]  
		y = img.shape[0]
		self.zoomscale = 1  
		frame = QImage(img, x, y, QImage.Format_RGB888)
		pix = QPixmap.fromImage(frame)
		self.item = QGraphicsPixmapItem(pix)  
		self.scene = QGraphicsScene()  
		self.scene.addItem(self.item)
		self.view.setScene(self.scene)

if __name__ == "__main__":
	app = QApplication(sys.argv)
	mainWindow = show_photo()
	mainWindow.show()
	sys.exit(app.exec_())

then the GUI code:

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'D:\Projects\photo_view/photo_view.ui'
#
# Created by: PyQt5 UI code generator 5.12.3
#
# WARNING! All changes made in this file will be lost!


from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_Photo_view(object):
    def setupUi(self, Photo_view):
        Photo_view.setObjectName("Photo_view")
        Photo_view.resize(890, 682)
        self.centralwidget = QtWidgets.QWidget(Photo_view)
        self.centralwidget.setObjectName("centralwidget")
        self.select_button = QtWidgets.QPushButton(self.centralwidget)
        self.select_button.setGeometry(QtCore.QRect(770, 140, 75, 23))
        self.select_button.setCheckable(True)
        self.select_button.setObjectName("select_button")
        self.pic_show = QtWidgets.QGraphicsView(self.centralwidget)
        self.pic_show.setGeometry(QtCore.QRect(0, 0, 711, 641))
        self.pic_show.setObjectName("pic_show")
        Photo_view.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(Photo_view)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 890, 23))
        self.menubar.setObjectName("menubar")
        Photo_view.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(Photo_view)
        self.statusbar.setObjectName("statusbar")
        Photo_view.setStatusBar(self.statusbar)

        self.retranslateUi(Photo_view)
        self.select_button.clicked.connect(Photo_view.select_button_clicked)
        QtCore.QMetaObject.connectSlotsByName(Photo_view)

    def retranslateUi(self, Photo_view):
        _translate = QtCore.QCoreApplication.translate
        Photo_view.setWindowTitle(_translate("Photo_view", "MainWindow"))
        self.select_button.setText(_translate("Photo_view", "选择文件"))

[jsulm]

@Acton-Martin I think you forgot

self.view.show()

[jsulm]

@Acton-Martin Please do not create a new thread for that: https://forum.qt.io/topic/110747/thank-you :-)
It creates a new window because your self.view does not have a parent.
Try

self.view = QGraphicsView(self)

[Acton Martin]

@jsulm Give my best thanks for your help. I make a mistake to Reply.