python---数据结构---dfs---bfs

from collections import defaultdict, deque
#无向图 邻接表
class Graph:
    def __init__(self):
        self.graph = defaultdict(list)

    def addEdge(self, u, v):
        self.graph[u].append(v)
        self.graph[v].append(u)

    def DFSUtil(self, v, visited):
        visited[v] = True
        print(v, end=' ')

        for neighbour in self.graph[v]:
            if visited[neighbour] == False:
                self.DFSUtil(neighbour, visited)

    def DFS(self, v):
        visited = defaultdict(bool)
        self.DFSUtil(v, visited)

    def BFSUtil(self, v, visited):
        visited[v] = True
        print(v, end=' ')

        for neighbour in self.graph[v]:
            if visited[neighbour] == False:
                self.BFSUtil(neighbour, visited)

    def BFS(self, s):
        visited = defaultdict(bool)
        queue = deque()

        queue.append(s)
        visited[s] = True

        while queue:
            s = queue.popleft()
            self.BFSUtil(s, visited)
            for neighbour in self.graph[s]:
                if visited[neighbour] == False:
                    queue.append(neighbour)
                    visited[neighbour] = True
g = Graph()
g.addEdge(0, 1)
g.addEdge(0, 2)
g.addEdge(1, 2)
g.addEdge(2, 0)
g.addEdge(2, 3)
g.addEdge(3, 3)
print("DFS :")
g.DFS(1)
print("\nBFS :")
g.BFS(2)