old_contents: """tensorflow_docs is a package for generating python api-reference docs."""
  
  from tensorflow_docs import api_generator
  
  
new_contents: """tensorflow_docs is a package for generating python api-reference docs."""
  
  from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  
  from tensorflow_docs import api_generator
  
subject: Add standard futures.