KeyError: 'pop from an empty set'
说集合是空的，不晓得为啥子
class UrlManager(object): def __init__(self): self.new_urls = set() self.old_urls = set() 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.add(url) def has_new_url(self): return len(self.new_urls) != 0 def get_new_url(self): new_url = self.new_urls.pop() self.old_urls.add(new_url) return new_url def add_new_urls(self, urls): if urls is None or len(urls) == 0: return for url in urls: self.add_new_url(url)
