def import_required(mod_name, error_msg):
    ''' Attempt to import a required dependency.

    Raises a RuntimeError if the requested module is not available.

    Args:
        mod_name (str) : name of the required module to try to import
        error_msg (str) : error message to raise when the module is missing

    Returns:
        imported module

    Raises:
        RuntimeError

    '''
    try:
        return import_module(mod_name)
    except __HOLE__:
        raise RuntimeError(error_msg)
dataset/ETHPy150Open bokeh/bokeh/bokeh/util/dependencies.py/import_required