PyQt: the old style signals are not working

[ravi.xolve]

With respect to this question:

http://stackoverflow.com/questions/5765077/qtwebkit-loadfinished-and-loadprogress-slots-are-never-executed/5765594

The connect call as:

QObject.connect(web, SIGNAL("loadFinished()"), xprinter.print_page_info)
doesn't work.

But in the answer provided:

web.loadFinished.connect(xprinter.print_page_info)
This works fine.

Please tell why?