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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 __initialize_model(self):
 """ Initializes the Model. """


        LOGGER.debug("> Initializing model.")

        self.beginResetModel()
        self.root_node = umbra.ui.nodes.DefaultNode(name="InvisibleRootNode")
        self.__default_project_node = ProjectNode(name=self.__default_project,
                                                  parent=self.root_node,
                                                  node_flags=int(Qt.ItemIsEnabled),
                                                  attributes_flags=int(Qt.ItemIsEnabled))
        self.enable_model_triggers(True)
        self.endResetModel()