def _create_attr_map(self, df=None, columns=None):

        if df is not None and columns is not None:
            self._generate_items(df, columns)

        iterable = self._setup_iterable()

        return {item: next(iterable) for item in self._item_tuples()}
Set the maximum value of the progress bar
dataset/ETHPy150Open bokeh/bokeh/bokeh/charts/attributes.py/AttrSpec._create_attr_map--crossover with--dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/wx/wx_progress_bar.py/WxProgressBar.set_maximum