gistfile1.py

import sys
from PySide.QtGui import *
from PySide.QtCore import *
from PySide.QtWebKit import *


class RenderJavaScript(QWebPage):

    def __init__(self, url):
        self.app = QApplication(sys.argv)
        QWebPage.__init__(self)
        self.loadFinished.connect(self._loadFinished)
        self.mainFrame().load(QUrl(url))
        self.app.exec_()

    def _loadFinished(self, result):
        self.frame = self.mainFrame()
        self.app.quit()

r = RenderJavaScript('http://www.google.co.uk')
html = r.frame.toHtml()
print html