def prepare_arg(argument):
    """Prepend dashes to conform with cli standards on arguments if necessary"""
    keyword, arg = argument.split('=')
    if len(keyword) == 1:
        keyword = '-' + keyword
    elif len(keyword) == 2 and keyword[0] == '-':
        pass
    elif keyword[:2] != '--':
        keyword = '--' + keyword
    return [keyword, arg]
