def _listify(objs):
    """
    Listify `objs` :: str

    >>> _listify("aaa bbb ccc")
    ['aaa', 'bbb', 'ccc']
    >>> _listify("aaa, bbb, ccc")
    ['aaa', 'bbb', 'ccc']
    >>> _listify("aaa, bbb, c c c")
    ['aaa', 'bbb', 'c c c']
    """
    return [s.strip() for s in objs.split(',' if ',' in objs else None)]