PyQt5使用QWebEngineView渲染提取数据

在PyQt4中，使用QtWebKit中的QWebView渲染页面，得到原始的html，代码如下：

pp = QApplication([]) 
webview = QWebView() 
loop = QEventLoop() 
webview.loadFinished.connect(loop.quit) 
webview.load(QUrl(url)) 
loop.exec_() 
html = webview.page().mainFrame().toHtml()

但是PyQt5中使用QWebEngineView代替上述的QWebView，我怎么能使用QWebEngineView完成上面那样的获得源html呢？
如下，我的代码可以显示网页，但我怎么得到html文件呢？

url = 'http://example.python-scraping.com/dynamic'
    # html = download(url)
    app = QApplication([])

    webview = QWebEngineView()
    loop = QEventLoop()
    # webview.loadFinished.connect(loop.quit)
    webview.load(QUrl(url))
    webview.show()
    loop.exec_()

已解决

import sys
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5.QtWebEngineWidgets import QWebEngineView
import requests
import lxml.html


class Render(QWebEngineView):  # 子类Render继承父类QWebEngineView
    def __init__(self, url):
        self.html = ''
        self.app = QApplication(sys.argv)
        super().__init__()
        self.loadFinished.connect(self._loadFinished)
        self.load(QUrl(url))
        self.app.exec_()

    def _loadFinished(self):
        self.page().toHtml(self.callable)

    def callable(self, data):
        self.html = data
        self.app.quit()


if __name__ == '__main__':
    url = 'http://example.python-scraping.com/dynamic'
    r = Render(url)
    result = r.html
    tree = lxml.html.fromstring(result)
    a = tree.cssselect('#result')[0].text_content()
    print(a)

你可以参考下这篇文章：pyqt5 开发浏览器 （pyqt5 QWebEngineView开发浏览器）