# Python - strange behaviour

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Hello everyone,
Yesterday I got my homework from my math teacher. We are studing graphs ( f(x) = x^2 for example ) and how to visualize them( yeah I know, easy )
So she gave me the task to write a programm that will print the graph on the screen. I've chosen python because its high lvl language and I do't have exp with it. (I''m using pygame)
I came to the part where I need to grab the mouse coordinates, substract them from the last mouse coords so I can get a vector represention my movement.
 elif event.type == MOUSEMOTION: print('--------------------') self.mousepos1 = self.mousepos2 self.mousepos1.Print() self.mousepos2.x, self.mousepos2.y = event.pos self.mousepos2.Print() self.mousemotion.Print() self.mousemotion.x = self.mousepos2.x - self.mousepos1.x self.mousemotion.y = self.mousepos2.y - self.mousepos1.y self.mousemotion.Print() 
Sorry for the possibly dumb question but why the hell this prints something like:
 -------------------- [ 614 , 258 ] [ 625 , 212 ] [ 0 , 0 ] [ 0 , 0 ] 
NOTE: I was using functions for +, -, * , /, however I put everything here because I have no idea why it is behaving this way(I assumed the functions may be the problem, but it isn't)
EDIT: I'll post the whole code if requiredq just ask - its only 100 lines. I'm using python ver 3.2.2 Edited by Nickie

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NEVERMIND!
I've been using something like C's references. Fixed!