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#!/usr/bin/env pythonclass UI:    def __init__(self, tree):        self.x = 4class PlayerUI(UI):    def __init__(self, tree=None):        UI.__init__(self, tree)class Test:    def __init__(self, someui):        self.myui = someui        print self.myui.xif __name__ == "__main__":    foo = PlayerUI()    Test(foo)