from PyQt4 import QtCore, QtGui


connector = QtCore.QObject()


def connected_to(source, signature):
    '''
    '''
    def connect(slot):
        connector.connect(source, QtCore.SIGNAL(signature), slot)
        return slot
    #
    return connect


app = QtGui.QApplication([])
timer = QtCore.QTimer()
timer.start(3000)


@connected_to(timer, 'timeout()')
def trigger():
    print 'Hello and exit!'
    app.exit()


print 'starting...'
app.exec_()