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src/p/y/pyHarp-0.1/pyharp/http_helper.py   pyHarp(Download)
        page['statusText'] = 'IN_DOWNLOAD_QUEUE'
        if observer:
            self.signals.observe(observer)
#             print 'observes: %r' % self.signals.observes
            self.signals.emit('page:change', object = page)