lattice.py 文件源码

def get_children(p, s, length):
    children = set()
    if length < 0:
        return children
    for subset in permutations(s, length):
        setsubset = set(subset)
        append = True
        for node in children:
            if setsubset == node.s:
                append = False
                break
        n = Node(setsubset, p)
        n.children = get_children(n, setsubset, length-1)
        if append:
            children.add(n)
    return children