code: def get_item(self, item_index, force_download=False):
          
          return self.client.get_item(self.item_urls[item_index], force_download)
docs: Retrieve the metadata for a specific item in this ItemGroup
  
          :type item_index: int
          :param item_index: the index of the item
          :type force_download: Boolean
          :param force_download: True to download from the server
              regardless of the cache's contents
  
          :rtype: Item
          :returns: the metadata, as an Item object
  
          :raises: APIError if the API request is not successful