class MainWindow(QtGui.QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()

        self.webView=QtWebKit.QWebView()
        self.webView.load(QtCore.QUrl("http://google.com"))
        
    def print_(self):
        
        
        printer = QtGui.QPrinter(QtGui.QPrinter.HighResolution)
        printer.setPageSize(QtGui.QPrinter.A4)
        preview = QtGui.QPrintPreviewDialog(printer,self)
        preview.paintRequested.connect(self.printPreview)
        preview.exec_()
  

    def printPreview(self, printer):
        self.webView.print_(printer)