code: def get_path(self, url):
          
          cache_path = self._url_to_path(url)
          if os.path.exists(cache_path):
              return cache_path
  
          return None
docs: Returns the path of a cached resource.
  
          Args:
              url: The url of the resource
  
          Returns:
              The path to the cached resource or None if not in the cache