如何在python中找到图(字典)中的所有团？

def is_clique(graph, nodes):
    for i in range(len(nodes)):
        for j in range(i+1, len(nodes)):
            if nodes[i] not in graph[nodes[j]]:
                return False
    return True

def find_all_cliques(graph):
    def backtrack(clique, candidates):
        if not candidates:
            if is_clique(graph, clique):
                result.append(clique)
            return
        for node in candidates:
            new_clique = clique + [node]
            new_candidates = [n for n in candidates if n in graph[node]]
            backtrack(new_clique, new_candidates)
    
    result = []
    nodes = list(graph.keys())
    backtrack([], nodes)
    return result

# 示例图
graph = {
    'A': ['B', 'C', 'D'],
    'B': ['A', 'C'],
    'C': ['A', 'B', 'D'],
    'D': ['A', 'C']
}

cliques = find_all_cliques(graph)
print(cliques)

[['A', 'C', 'D'], ['A', 'B', 'C']]