code: def get(self, url):
          '''Get the entity that corresponds to URL.'''
          robots_url = Robots.robots_url(url)
          if robots_url not in self.cache:
              self.cache[robots_url] = ExpiringObject(partial(self.factory, robots_url))
          return self.cache[robots_url].get(f get(self, url):
          '''Get the entity that corresponds to URL.'''
          robots_url = Robots.robots_url(url)
          if robots_url not in self.cache:
              self.cache[robots_url] = ExpiringObject(partial(self.factory, robots_url))
          return self.cache[robots_url].get()
docs: Get the entity that corresponds to URL.