old_contents: #!/usr/bin/env python
  # coding=utf-8
  from __future__ import division, print_function, unicode_literals
  
  __version__ = "0.4"
new_contents: #!/usr/bin/env python
  # coding=utf-8
  from __future__ import division, print_function, unicode_literals
  from experiment import Experiment
  
  __version__ = "0.4"
  
subject: put Experiment back into sacred namespace