该代码在有关图论的python官方论文中给出。这是代码：

def find_all_paths(graph, start, end, path=[]):
        path = path + [start]
        if start == end:
            return [path]
        if not graph.has_key(start):
            return []
        paths = []
        for node in graph[start]:
            if node not in path:
                newpaths = find_all_paths(graph, node, end, path)
                for newpath in newpaths:
                    paths.append(newpath)
        return paths

我不擅长python，因为我还没有足够的实践能力和阅读能力。您能否通过将其与DFS图中的兄弟姐妹概念相关联来解释代码？谢谢。