Creating geometry in python

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Hello again boys,

I have another problem and I hope someone can help me. I have executed successful the examples using python, now I programming my own simulation, but I should not use the modules, because my thesis. My problem:

Declaring my World Physical volume in C++

physicWorld = new G4PVPlacement(0,
				G4ThreeVector(),
				logicWorld,
				"Mundo",
				0,
				false,
				0);

And it compiled ok, but, in python I did almost the same thing:

physicWorld =     G4PVPlacement(0,
				G4ThreeVector(),
				logicWorld,
				"Mundo",
				0,
				False,
				0)
And it hasn´t compiled. I´ve received a error saying that doens´t exist a method with my inputs.
I think this happens because the zero (0), the method ask for HepGeom::Transform3D or CLHEP::HepRotation 
and my input is int (zero, 0). I guess that I have two options, use the methods in python, but I don´t know how 
or find out how to put zero, null(None) in python. Ok, I am not a python programmer, but I am trying, someone can give me a tip?

Thanks guys ;)

Rafael