def METHOD_NAME(self, progressbar=lambda x: x):
    """ Get node module for specified part.
    progressbar - Should be a function that takes an iteraable, and
                  yields all elements from that iterable.
                  This can be used to generate a progressbar, for example
                  the module progressbar satifies this interface.
                    Example:
                    import progressbar
                    db = Database(...)
                    node_model = db.node_model(progressbar.progressbar)
    """
    self._read_node_wires()
    return NodeModel(
        grid=self.grid(),
        connections=self.connections(),
        tile_wires=self._get_tile_wires(),
        node_wires=self.node_wires,
        progressbar=progressbar)