old_contents: __version__ = '2.2.0'
  
  from libsbol import *
  import unit_tests
new_contents: from __future__ import absolute_import
  
  __version__ = '2.2.0'
  
  from sbol.libsbol import *
  import sbol.unit_tests
subject: Fix import issue with Python 3.6/Support future Python by forcing absolute import