添加下面一行即可修复

view.show()

view.show()是一个方法，用于在屏幕上显示QWebEngineView小部件。

您的固定编码为

from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtWebEngineWidgets import *

app = QApplication([])
window = QMainWindow()
window.setWindowTitle('My Browser')

view = QWebEngineView()
window.setCentralWidget(view)
view.show()  #import

view.setUrl(QUrl('https://www.google.com'))
window.show()
app.exec_()