code: def evict(self, urls):
          
          if isinstance(urls, six.text_type):
              urls = [urls]
          urls = set(normalize_url(url) for url in urls)
          retval = 0
          for key in list(self.cache):
              if key[0] in urls:
                  retval += 1
                  del self.cache[key]
                  del self.timeouts[key]
          return retval
docs: Remove items from cache matching URLs.
  
          Return the number of items removed.