廣度搜索，優(yōu)先搜索最相關(guān)條目

思考了一下，拋磚引玉，誰眼尖幫我看一下是不是廣搜？謝謝

class?UrlManager(object):
????def?__init__(self):
????????self.new_urls?=?[]????????#?改成了list，方便pop首元素
????????self.old_urls?=?[]

????def?add_new_url(self,?url):
????????if?url?is?None:
????????????return
????????if?url?not?in?self.new_urls?and?url?not?in?self.old_urls:
????????????self.new_urls.append(url)?????????#?更改了

????def?add_new_urls(self,?urls):
????????if?urls?is?None?or?len(urls)?==?0:
????????????return
????????for?url?in?urls:
????????????self.add_new_url(url)

????def?has_new_url(self):
????????return?len(self.new_urls)?!=?0

????def?get_new_url(self):
????????new_url?=?self.new_urls.pop(0)????????#?彈出首元素，訪問
????????self.old_urls.append(new_url)?????????#?更改了
????????return?new_url