def title_from_columns(cols):
    if cols is not None:
        cols_title = copy(cols)
        if not isinstance(cols_title, list):
            cols_title = [cols_title]
        return str(', '.join(cols_title).title()).title()
    else:
        return None
Creates standard string representation of columns.
dataset/ETHPy150Open bokeh/bokeh/bokeh/charts/utils.py/title_from_columns