code: def retrieve(self, block_height, headers=None):
          
          path = self.path + block_height
          return self.transport.forward_request(
              method='GET', path=path, headers=None)
docs: Retrieves the block with the given ``block_height``.
  
          Args:
              block_height (str): height of the block to retrieve.
              headers (dict): Optional headers to pass to the request.
  
          Returns:
              dict: The block with the given ``block_height``.