old_contents: """Single source to the version across setup.py and the whole project.
  """
  from __future__ import unicode_literals
  __version__ = '2.6.6'
  
  
new_contents: """Single source to the version across setup.py and the whole project.
  """
  from __future__ import unicode_literals
  __version__ = '2.6.8'
  
  
subject: Update version.py