def lists_diff(list1, list2):
    """
    Get the difference of two list and remove None values.

    >>> list1 = ["a", None, "b", "c"]
    >>> list2 = [None, "b", "d", "e"]
    >>> list(filter(None.__ne__, set(list1) - set(list2)))
    ['c', 'a']
    """
    return list(filter(None.__ne__, set(list1) - set(list2)))