tasks.py 文件源码

def list_to_set_reducer(self, groups):
    """Flatten nested lists to a set of items

    Expected shape of input, List of group results, each item in
    group results is list of items to reduce.
    [[[item1, item2], [item2, item3]], [[item4, item5]]]

    :param groups: List of group results. Each group result is expected to be
    an itterable containing itterables of set members.

    :returns: List of unique values from the input
    :rtype: list
    """
    # TODO does this assume too much knowledge of the shape of the input?
    # print 'list_to_set_reducer: {}'.format(groups)
    s = set()
    for g in groups:
        for i in g:
            s.update(i)

    return list(s)