在python中为BFS向队列添加多个键值

from collections import deque

def bfs(graph, start_node):
    visited = set()
    queue = deque()
    queue.append(start_node)

    while queue:
        node = queue.popleft()
        if node not in visited:
            visited.add(node)
            print(node)  # 这里可以根据需要进行相应的处理

            # 将当前节点的邻居节点添加到队列中
            neighbors = graph[node]
            for neighbor in neighbors:
                queue.append(neighbor)

# 示例图的邻接表表示
graph = {
    'A': ['B', 'C'],
    'B': ['D', 'E'],
    'C': ['F'],
    'D': [],
    'E': ['F'],
    'F': []
}

start_node = 'A'
bfs(graph, start_node)