def parse_None(el: object) -> object:
    """
    Parse element or list of elements, inserting None when it finds a string 'None'

    :param el: List or single element to parse
    :return: List or single element parsed
    """
    if isinstance(el, list):
        for i in range(0, len(el)):
            if el[i] == 'None':
                el[i] = None
    elif el == 'None':
        el = None
    return el