[Python]图的遍历-DFS

__author__ = 'Aaron Yang'
__email__ = '[email protected]'
__date__ = '6/30/2020 3:44 PM'

result = list()


def dfs(graph, visited, init_node):
    if init_node not in visited:
        visited.append(init_node)
        for connected_node in graph[init_node]:
            dfs(graph, visited, connected_node)


if __name__ == '__main__':
    graph_dict = {
        "A": {"B": 7, "D": 5},
        "B": {"A": 7, "C": 8, "D": 9, "E": 5},
        "C": {"B": 8, "E": 5},
        "D": {"A": 5, "B": 9, "E": 15, "F": 6},
        "E": {"B": 7, "C": 5, "D": 15, "F": 8, "G": 9},
        "F": {"D": 6, "E": 8, "G": 11},
        "G": {"E": 9, "F": 11}
    }

    for k, v in graph_dict.items():
        graph_dict[k] = list(v.keys())

    # {
    # 'A': ['B', 'D'],
    # 'B': ['A', 'C', 'D', 'E'],
    # 'C': ['B', 'E'],
    # 'D': ['A', 'B', 'E', 'F'],
    # 'E': ['B', 'C', 'D', 'F', 'G'],
    # 'F': ['D', 'E', 'G'],
    # 'G': ['E', 'F']
    # }

    dfs(graph_dict, result, "D")
    print(result) # ['D', 'A', 'B', 'C', 'E', 'F', 'G']