new_contents: # -*- coding: utf-8 -*-
  #
  #  This file is part of Sequana software
  #
  #  Copyright (c) 2016 - Sequana Development Team
  #
  #  File author(s):
  #      Thomas Cokelaer <thomas.cokelaer@pasteur.fr>
  #
  #  Distributed under the terms of the 3-clause BSD license.
  #  The full license is in the LICENSE file, distributed with this software.
  #
  #  website: https://github.com/sequana/sequana
  #  documentation: http://sequana.readthedocs.io
  #
  ##############################################################################
  import os
  
  __all__ = ["Annotation"]
  
  
  class Annotation():
  
      def __init__(self, filename):
  
          self.filename = filename
          assert os.path.exists(filename)
  
  
subject: add a parent class for gff/genbank classes