from collections import deque
def person_is_seller(name):
return name[-1] == 'm'
def search(name):
search_queue = deque()
search_queue += graph[name]
searched = set() # set()函数创建一个无序不重复元素集，可进行关系测试，删除重复数据，还可以计算交集、差集、并集等
while search_queue:
person = search_queue.popleft()
if person not in searched:
if person_is_seller(person):
print(person + " is a mango seller!")
return True
else:
search_queue += graph[person]
searched.add(person)
return False
if __name__ == "__main__":
graph = {}
graph["you"] = ["alice", "bob", "claire"]
graph["bob"] = ["anuj", "peggy"]
graph["alice"] = ["peggy"]
graph["claire"] = ["thom", "jonny"]
graph["anuj"] = []
graph["peggy"] = []
graph["thom"] = []
graph["jonny"] = []
search("you")
