new_contents: # -*- coding: utf-8 -*-
  
  """
  Copyright [2009-2017] EMBL-European Bioinformatics Institute
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  http://www.apache.org/licenses/LICENSE-2.0
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  """
  
  import abc
  import os
  
  import luigi
  
  
  class GenericCompressTask(luigi.Task):
      """
      This will compress the files the generic FASTA export files.
      """
  
      __metaclass__ = abc.ABCMeta
  
      @abc.abstractmethod
      def inputs(self):
          return []
  
      def requires(self):
          for requirement in self.inputs():
              yield requirement
  
      def output(self):
          for requirement in self.inputs():
              yield luigi.LocalTarget(requirement.output().fn + '.gz')
  
      def run(self):
          for requirement in self.inputs():
              os.system('gzip %s' % requirement.output().fn)
  
subject: Add a simple generic compress task