def str2list(v):
    """
    Transform user input list(arguments) to be list of string.
    Multiple options needs comma(,) between each options.
    ex)
        --strategies ST01
        --strategies ST01,ST02,ST03

    :param v: (string) user input
    :return: list of option string. (ex - ['ST01', 'ST02', 'ST03')
    """
    if isinstance(v, list):
        return v

    return v.strip().split(",")