qt 4.7 signal limit test

import sys
from PySide import QtCore, QtGui

class Window(QtGui.QMainWindow):

    def __init__(self):
        super(Window, self).__init__()
        self.timer = QtCore.QTimer(self)
        self.timer.timeout.connect(self.onTimeout)
        self.n = 0

        self.timer.start(1000)

    @QtCore.Slot()
    def onTimeout(self):

        exec("Window.sig%d = QtCore.Signal(object, object)" % self.n)
        eval("self.sig%d" % self.n).connect(self.onSignalN)

        for i in xrange(self.n+1):
            eval("self.sig%d[object, object]" % i).emit( i,self )

        self.n += 1
        print ""

    @QtCore.Slot(object, object)
    def onSignalN(self, o1, o2):
        print o1,

app = QtGui.QApplication(sys.argv)

win = Window()

win.resize(320, 240)
win.setWindowTitle("Hello, World!")
win.show()

sys.exit(app.exec_())