code: def get_patient_expression(job, patient_dict):
      
      expression_archive = job.fileStore.readGlobalFile(patient_dict['expression_files'])
      expression_archive = untargz(expression_archive, os.getcwd())
      output_dict = {}
      for filename in 'rsem.genes.results', 'rsem.isoforms.results':
          output_dict[filename] = job.fileStore.writeGlobalFile(os.path.join(expression_archive,
                                                                             filename))
      return output_dict
docs: Convenience function to get the expression from the patient dict
  
      :param dict patient_dict: dict of patient info
      :return: The gene and isoform expression
      :rtype: toil.fileStore.FileID