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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def getActors(self):
 """Unpack a list of ``vtkActor`` objects from a ``vtkAssembly``."""

        cl = vtk.vtkPropCollection()
        self.GetActors(cl)
        self.actors = []
        cl.InitTraversal()
        for i in range(self.GetNumberOfPaths()):
            act = vtk.vtkActor.SafeDownCast(cl.GetNextProp())
            if act.GetPickable():
                self.actors.append(act)
        return self.actors