code: def get_file(self, fid):
          
          url = self.get_file_url(fid)
          return self.conn.get_raw_data(url)
docs: Get file from WeedFS.
  
          Returns file content. May be problematic for large files as content is
          stored in memory.
  
          Args:
              **fid**: File identifier <volume_id>,<file_name_hash>
  
          Returns:
              Content of the file with provided fid or None if file doesn't
              exist on the server
  
          .. versionadded:: 0.3.1