PyQt: the old style signals are not working

With respect to this question:

http://stackoverflow.com/questions/5...ecuted/5765594

The connect call as:

Code:

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QObject.connect(web, SIGNAL("loadFinished()"), xprinter.print_page_info)

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doesn't work.

But in the answer provided:

Code:

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web.loadFinished.connect(xprinter.print_page_info)

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This works fine.

Please tell why?