python--动态网页渲染pyqt5

原文：https://blog.csdn.net/tymatlab/article/details/78647543

PyQt5 渲染动态网页

示例代码：

# -*- coding: UTF-8 -*-
import sys
from PyQt5.QtCore import QUrl
from PyQt5.QtWidgets import QApplication
from PyQt5.QtWebEngineWidgets import QWebEnginePage, QWebEngineView
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)
        QWebEngineView.__init__(self)       # 子类构造函数继承父类，这种写法python2和3通用，还可以是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.webscraping.com/places/default/dynamic'

r = Render(url)
    result = r.html

tree = lxml.html.fromstring(result)
    a = tree.cssselect('#result')[0].text_content()
    print(a)

注意：

1.PyQt版本之间的区别

版本	用法
PyQt4	from PyQt4.QtWebKit import QWebPage, QWebView
PyQt5	from PyQt5.QtWebKitWidgets import QWebPage, QWebView
PyQt5.6+	from PyQt5.QtWebEngineWidgets import QWebEnginePage, QWebEngineView

可参考：

• 解决 No module named PyQt5.QtWebKitWidgets

• http://www.widlabs.com/article/no-module-named-pyqt5-qtwebkitwidgets

• Qt Documentation

2.PyQt4中的mainFrame在PyQt5中已废弃

版本	用法
PyQt4	html = webview.page().mainFrame().toHtml()
PyQt5	self.page().toHtml(self.callable)

可参考：

• https://stackoverflow.com/questions/37754138/how-to-render-html-with-pyqt5s-qwebengineview